CN110240260B - Sewage treatment equipment and method based on biomembrane thickness in-situ control - Google Patents
Sewage treatment equipment and method based on biomembrane thickness in-situ control Download PDFInfo
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Abstract
The invention relates to sewage treatment equipment and a method based on biomembrane thickness in-situ control, wherein the device comprises a water inlet pool, a water inlet pump, a reactor and a water outlet valve which are connected in sequence, a bubble-free aeration membrane is arranged in the reactor, the equipment also comprises a gas pressure regulating valve used for regulating the oxygen partial pressure and the dissolved oxygen concentration in the membrane, one end of the gas pressure regulating valve is connected to an air compressor, and the other end of the gas pressure regulating valve is connected to each bubble-free aeration membrane through an air inlet pipe assembly; after the reactor is inoculated with sludge, wastewater containing high ammonia nitrogen enters the reactor after the pH value is adjusted in advance, and oxygen partial pressure and dissolved oxygen concentration in the membrane in the reactor are adjusted, so that after a biological membrane is formed on the surface of a bubble-free aeration membrane, oxygen pollution substrates are diffused and transferred in opposite directions in the biological membrane, and nitrification and denitrification are synchronously performed. Compared with the prior art, the invention reduces the requirement of an electron donor, occupies small area of the membrane device, reduces the cost of sewage treatment and realizes low carbonization of sewage treatment.
Description
Technical Field
The invention relates to the technical field of environmental protection and water treatment technology and equipment, in particular to sewage treatment equipment and a sewage treatment method based on biofilm thickness in-situ control.
Background
In a general sewage treatment process, blast air bubble aeration or surface aeration is mostly adopted, so that not only is the energy consumption high, but also volatile organic pollutants enter the atmosphere along with bubbles to cause environmental pollution. The traditional sewage denitrification process is realized by two processes of nitrification and denitrification, wherein nitrifying bacteria and denitrifying bacteria are respectively in different reactors (spatially segmented), or in different time periods in the same reactor, the nitrogen removal is realized by alternation of aerobic and anaerobic environments, and the process has the defects of longer process flow, mixed liquid backflow requirement, higher operation energy consumption, larger generated sludge amount, large occupied area, high capital investment, and the need of adding extra carbon source organic matters if the carbon source in the denitrification stage is insufficient. Therefore, the development of new biological denitrification process with high efficiency and low consumption becomes one of the research hotspots in the sewage treatment field at present. The membrane aeration biomembrane reactor is used for denitrification by a short-cut denitrification process, ammonia nitrogen is controlled in a nitrosation stage and then denitrification is directly carried out, and energy consumption is greatly reduced.
The short-cut nitrification denitrification utilizes the principle that ammonia nitrogen is controlled to be oxidized in a nitrosation stage and then is directly subjected to denitrification, so that the process flow of denitrification can be greatly shortened, the energy consumption required by oxidizing nitrite into nitrate is saved, the produced sludge amount is less, and the operating cost of sewage treatment can be greatly reduced, therefore, the short-cut nitrification denitrification becomes a novel high-efficiency low-consumption way for sewage denitrification treatment. At present, the short-cut nitrification and denitrification process is mostly in two stages, namely, the first stage finishes nitrosation, namely, ammonia nitrogen is oxidized into nitrite; the second section is denitrification or anaerobic ammonia oxidation to realize the removal of nitrogen. The two-stage short-cut nitrification and denitrification process still has the problems of long process flow, unstable operation and treatment effect, complex control and management and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a sewage treatment device and method based on biofilm thickness in-situ control.
The purpose of the invention can be realized by the following technical scheme:
a sewage treatment device based on biomembrane thickness in-situ control comprises a water inlet pool, a water inlet pump, a reactor and a water outlet valve which are connected in sequence, wherein a bubble-free aeration membrane is arranged in the reactor;
after the reactor is inoculated with sludge, wastewater containing high ammonia nitrogen enters the reactor after the pH value is adjusted in advance, and oxygen partial pressure and dissolved oxygen concentration in the membrane in the reactor are adjusted, so that after a biological membrane is formed on the surface of a bubble-free aeration membrane, oxygen pollution substrates are diffused and transferred in opposite directions in the biological membrane, and nitrification and denitrification are synchronously performed.
The equipment also comprises a mixed liquid circulating pump, a pH meter for measuring the pH value and a dissolved oxygen measuring instrument for measuring the concentration of dissolved oxygen in English, wherein the input end of the mixed liquid circulating pump is connected with the top end part of the reactor, the output end of the mixed liquid circulating pump is connected into a water inlet pipeline for connecting a water inlet pump and the reactor, the water inlet pump is connected to the bottom end part of the reactor through the water inlet pipeline, and the dissolved oxygen measuring instrument is connected into a circulating pipeline for connecting the mixed liquid circulating pump and the reactor; after the whole reactor is filled with water, the mixed liquid circulating pump is started, and then the continuous operation can be carried out.
The device also comprises a film scraping plate and an electromechanical device, and when the thickness of the biological film exceeds the standard, the electromechanical device controls the film scraping plate to scrape redundant parts.
And a sewage draining outlet is also formed in the bottom of the reactor.
The equipment further comprises a peristaltic pump and a flow meter, wherein the peristaltic pump is connected to each bubble-free aeration membrane through a second pipeline, and the flow meter is arranged in the second pipeline.
A control method of the device comprises the following steps:
step S1: sludge inoculation is carried out on the reactor;
step S2: pre-adjusting the pH value of the wastewater containing high ammonia nitrogen;
step S3: starting a water inlet pump, and allowing the wastewater with the adjusted pH value and containing high ammonia nitrogen to enter a reactor;
step S4: regulating the gas supply pressure of membrane aeration to gradually increase from low to high, and ensuring that the dissolved oxygen in the reactor is not higher than 1.0mg/L at the initial stage;
step S5: after a set amount of biological film grows on the surface of the bubble-free aeration film, controlling the concentration of dissolved oxygen in the mixed solution to be lower than a set value;
step S6: discharging the treated wastewater.
The pH value of water entering the reactor is controlled to be 7.5-8.3.
The pH of the water entering the reactor was controlled at 8.
In step S5, the dissolved oxygen concentration in the liquid mixture is controlled to be less than or equal to 0.1 mg/L.
Compared with the prior art, the invention has the following beneficial effects:
1. the nitritation and denitrification (namely short-cut denitrification) processes are realized in one system, and the special degrading microorganisms for realizing the nitritation processes, such as ammonia oxidizing bacteria and the like, are usually preferentially positioned at the interface of a biological membrane and an aeration membrane, mainly and intensively grow on the surface of the aeration membrane and stably exist in the reactor in the form of the biological membrane, so that the retention time can be longer, and the efficient removal of the nitrogen-containing wastewater is facilitated.
2. The oxygen supply is carried out by adopting a bubble-free membrane aeration mode, oxygen directly passes through the aeration membrane to supply microorganisms, the oxygen mass transfer efficiency is high, almost all the oxygen is consumed by ammonia oxidizing bacteria, the oxygen utilization efficiency is high, the energy consumption required by membrane aeration is very low, the energy consumption required by oxygen supply is greatly reduced, and the operation cost of sewage treatment can be greatly reduced.
3. In the reactor device, oxygen and a polluted substrate are diffused and transferred in opposite directions in a biological membrane, the biological membrane belongs to a heterotropic mass transfer biological membrane, the heterotropic mass transfer biological membrane is a device which obtains limited nutrient substances such as oxygen, the substrate and the like from two sides of the biological membrane, the concentration gradient direction of the membrane is just opposite to that of the traditional biomembrane method, the inner layer of the biomembrane at the side close to the carrier membrane has high concentration of dissolved oxygen and low concentration of organic substrates, the outer layer of the biological membrane close to one side of the liquid phase main body has low dissolved oxygen concentration and high substrate concentration, so that the active area of the heterotropic mass transfer biological membrane is changed, the active layer can be present at any position of the thickness of the biological membrane, not necessarily only at the wastewater interface of the biological membrane, thereby forming a unique microbial community structure and a redox layered structure of the membrane aeration biomembrane, stable aerobic and anaerobic layers can be produced, and relatively high rates can be achieved for simultaneous nitrification/denitrification and removal of COD.
4. The surface of the aeration membrane is optimized through spatial layout, the oxygen mass transfer efficiency is high, the oxygen supply energy consumption is low, the operation cost can be greatly reduced, the specific surface area of the aeration membrane after the spatial layout optimization is large, the biomass accumulation is facilitated, the biological membrane can be better and uniformly attached to the surface of the aeration membrane in the growth process, the activity layering of the biological membrane is obvious, the biological membrane close to the modified surface has the highest activity, the activity of the middle layer is higher, and the activity of the outer layer is lower. The surface biological membrane can be scraped after the biological membrane grows to a certain thickness, and the specific thickness interval of the biological membrane growing in the spatial layout optimization area is controlled, so that the activity of the biological membrane is ensured to be the highest, the activity of microorganisms is ensured to be the highest, and the short-cut nitrification and denitrification performance of the membrane aeration biological membrane reactor is ensured to be the best.
5. The mixed liquid circulating system is arranged, on one hand, the substrate in the mixed liquid can be ensured to be fully contacted with the biological membrane, the whole system is close to a completely mixed state, and the impact load resistance of the system is improved; on the other hand, the hydrodynamic characteristics of the surface of the biological film can be effectively controlled, and the growth and the thickness of the biological film can be controlled.
6. The space layout is optimized, the membrane aeration biomembrane reactor device is combined with the short-cut denitrification, the purpose of synchronous nitrification denitrification can be achieved, meanwhile, the requirement of an electron donor is further reduced due to the efficient transfer of the membrane to oxygen, the membrane device occupies small area, the cost of sewage treatment is reduced, and the low carbonization of the sewage treatment is realized.
7. The biofilm scraping device which can be controlled up and down is adopted, so that the biofilm can be maintained at a certain thickness, and the fallen biofilm can be collected into a sludge discharge hopper at the lower part of the reactor and discharged by a sludge discharge pipe through a flushing device.
Drawings
FIG. 1 is a flow chart of a membrane aeration biomembrane process device for spatial layout optimization of sewage short-cut nitrification and denitrification;
FIG. 2 is a diagram of a spatial layout-optimized membrane aeration overall structure and biofilm thickness control device;
wherein: 1. the device comprises a water inlet pool, 2, a water inlet pump, 3, a peristaltic pump, 4, a flowmeter, 5, a mixed liquid circulating pump, 6, a reactor, 7, a dissolved oxygen tester, 8, a gas pressure regulating valve, 9, a bubble-free aeration membrane component, 10, a water outlet valve, 11, an electromechanical device, 12, a membrane scraping plate, 13, a flushing device, 14, a sludge discharge hopper, 15 and a sewage outlet.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In recent years, with the intensive research on membrane aeration biomembranes, many researches prove that the membrane aeration biomembrane reactor has good sewage nitrification performance and is often accompanied with the generation of partial nitrosation (namely nitrite accumulation) phenomenon. In the membrane aeration biomembrane reactor device, oxygen and a polluted substrate are diffused and transferred in opposite directions in a biomembrane to form a unique microbial community structure of the membrane aeration biomembrane, so that a stable aerobic layer and an anaerobic layer can be produced, and synchronous denitrification is facilitated. The inventor finds that the membrane aeration biomembrane reactor is combined with the short-cut nitrification denitrification, so that the purpose of synchronous nitrification denitrification can be achieved, meanwhile, the requirement of an electron donor is further reduced due to the efficient transfer of the membrane to oxygen, the membrane device occupies a small area, the cost of sewage treatment is reduced, the low carbonization of sewage treatment is realized, and theoretical and practical basis is provided for applying the membrane material to the sewage treatment.
A sewage treatment device based on biomembrane thickness in-situ control is shown in figure 1 and comprises a water inlet pool 1, a water inlet pump 2, a reactor 6 and a water outlet valve 10 which are sequentially connected, wherein a bubble-free aeration membrane 9 is arranged in the reactor 6, the device also comprises a gas pressure regulating valve 8 for regulating the oxygen partial pressure and the dissolved oxygen concentration in the membrane, one end of the gas pressure regulating valve 8 is connected to an air compressor, and the other end is connected to each bubble-free aeration membrane 9 through an air inlet pipe assembly 16;
after the reactor 6 is inoculated with sludge, wastewater containing high ammonia nitrogen enters the reactor 6 after the pH value is adjusted in advance, and oxygen partial pressure and dissolved oxygen concentration in the membrane in the reactor 6 are adjusted to form a biological membrane on the surface of the bubble-free aeration membrane 9, and then oxygen pollution substrates are diffused and transferred in opposite directions in the biological membrane to synchronously carry out nitrification and denitrification.
The device also comprises a mixed liquid circulating pump 5, a pH meter for measuring the pH value and a dissolved oxygen measuring instrument 7 for measuring the concentration of dissolved oxygen in English, wherein the input end of the mixed liquid circulating pump 5 is connected with the top end part of the reactor 6, the output end of the mixed liquid circulating pump 5 is connected into a water inlet pipeline for connecting the water inlet pump 2 with the reactor 6, the water inlet pump 2 is connected with the bottom end part of the reactor 6 through the water inlet pipeline, and the dissolved oxygen measuring instrument 7 is connected into a circulating pipeline for connecting the mixed liquid circulating pump 5 with the reactor 6; after the whole reactor 6 is filled with water, the mixed liquid circulating pump 5 is started, and then the continuous operation can be carried out.
The device also comprises a film scraping plate 12 and an electromechanical device 11, when the thickness of the biological film exceeds the standard, as shown in figure 2, the electromechanical device 11 controls the film scraping plate 12 to scrape out redundant parts.
The bottom of the reactor 6 is also provided with a sewage outlet 15.
The device also comprises a peristaltic pump 3 and a flow meter 4, the peristaltic pump is connected to each bubble-free aeration membrane 9 through a second pipeline, and the flow meter 4 is arranged in the second pipeline.
The reactor 6 is mainly characterized in that an aeration membrane in the reactor is a bubble-free aeration membrane 9 with optimized spatial layout, and the short-cut nitrification and denitrification can be generated in the reactor by controlling the oxygen partial pressure, the inlet water pH, the dissolved oxygen concentration, the inlet water ammonia nitrogen concentration and the temperature in the membrane. The sewage short-range denitrification device can realize short-range denitrification of sewage while avoiding accumulation of nitrite, and reduce toxic action of the accumulation of nitrite on microorganisms.
The membrane aeration system is a space layout optimized silica gel membrane or other gas permeability membrane materials, the oxygen mass transfer efficiency is high, the oxygen supply energy consumption is low, and the operation cost can be greatly reduced. The invention has simple process flow, high denitrification efficiency and stable operation.
The sewage treatment system of the membrane aeration biomembrane reactor with optimized spatial layout mainly comprises a water inlet pump, a membrane aeration biomembrane, a mixed liquid circulating pump and a connecting pipeline thereof. The aeration membrane in the membrane aeration biomembrane zone adopts a tubular inorganic silica gel aeration membrane optimized by spatial layout.
The reactor 6 is made of plexiglass in this application.
The system in the application requires that the carbon-nitrogen ratio of inlet water is controlled below 5, and the SS of suspended solids in the inlet water is less than 20 mg/L. The hydraulic retention time in the medium system is controlled to be 4-12 h.
Firstly, sewage containing ammonia nitrogen is added into a reactor 6 of a membrane aeration biomembrane with optimized spatial layout through a water inlet pump 2 in a water inlet tank 1, a bubble-free aeration membrane 9 with optimized spatial layout is arranged in the reactor 6, and the surface of the bubble-free aeration membrane can grow a microorganism biomembrane to play a role of nitrosation. The bubble-free aeration membrane is filled with air through an air compressor, and the pressure of the air is displayed by a pressure gauge and is adjusted by a gas pressure adjusting valve 8. The sewage flows back the mixed liquid through the mixed liquid circulating pump 5, so that the retention time of the sewage is prolonged, and the treatment effect is improved. The treated effluent is discharged through the outlet valve 10. The pH value and the dissolved oxygen concentration in the whole system are measured by a pH meter and an online dissolved oxygen meter 7 for dissolved oxygen. The thickness of the biofilm can be controlled by an up and down movable wiper blade 12 controlled by an electromechanical device 11. The membrane scraping plate 12 runs from top to bottom, and the fallen biological membranes can be collected by the sludge discharge hopper 14 and then discharged from the sewage discharge outlet 15 after being washed by the washing device 13.
Specifically, the control method comprises the following steps:
step S1: sludge inoculation is carried out on the reactor 6;
step S2: pre-adjusting the pH value of the wastewater containing high ammonia nitrogen;
step S3: starting a water inlet pump 2, and allowing the wastewater with the adjusted pH value and containing high ammonia nitrogen to enter a reactor 6;
step S4: the gas supply pressure of the membrane aeration is adjusted to be gradually increased from low to high, and the dissolved oxygen in the reactor 6 is ensured not to be higher than 1.0mg/L at the initial stage;
step S5: after a set amount of biological film grows on the surface of the bubble-free aeration film 9, controlling the concentration of dissolved oxygen in the mixed solution to be lower than a set value;
step S6: discharging the treated wastewater.
The pH value of the water entering the reactor 6 is controlled to be 7.5-8.3.
The pH of the water entering the reactor 6 was controlled at 8.
In step S5, the dissolved oxygen concentration in the liquid mixture is controlled to be less than or equal to 0.1 mg/L.
The technical scheme for realizing the process of the invention mainly comprises the following steps: high ammonia nitrogen wastewater → pH value adjustment → entering a spatial layout optimized membrane aeration biomembrane reactor → adjustment of oxygen partial pressure and dissolved oxygen concentration in the membrane → temperature → water outlet. The specific method is that before the process application, the membrane aeration biomembrane reactor is firstly used for sludge inoculation. And inoculating nitrified sludge into the membrane aeration biomembrane reactor, circulating for 1 day in a closed loop, and then inoculating high-ammonia nitrogen wastewater to continuously run. The ammonia nitrogen load of the inlet water is from low to lowHigh step-up mode. The pH value of the high ammonia nitrogen wastewater is firstly adjusted before the high ammonia nitrogen wastewater enters a system, and sodium bicarbonate NaHCO is adopted3And sodium carbonate Na2CO3The pH value of the influent water is adjusted to about 8.0 by the pH value buffer solution of (2). Then, as shown in figure 1, high ammonia nitrogen wastewater is added into a space layout optimized membrane aeration biomembrane reactor 6 of the process system of the invention through a water inlet pump 2, and after the whole system is filled with water, a mixed liquid circulating pump 5 is started, and then the continuous operation can be carried out. The air supply pressure of the membrane aeration is also gradually increased from low to high, and the pressure is displayed by a pressure gauge. It is ensured at the initial stage that the dissolved oxygen in the reactor is not higher than 1.0mg/L, and the value of the dissolved oxygen is shown by a dissolved oxygen meter 7. When a certain amount of biological membrane grows on the surface of the aeration membrane, namely the dissolved oxygen in the mixed solution is gradually reduced, and finally the concentration of the dissolved oxygen in the mixed solution is controlled to be lower than 0.1mg/L or lower than the detection limit, so that the denitrification efficiency is improved. In general, the SS content in the effluent of the system is very low, and the effluent can also be connected into a sedimentation tank or be further improved by a membrane separation device.
The obtained device is used for treating certain high ammonia nitrogen wastewater. The water quality condition of the treated high ammonia nitrogen wastewater is as follows: NH (NH)4 +-N 200－250mg/L，CODCr50-80 mg/L, SS 10-20 mg/L, TP 4.2-6.1 mg/L, pH 7.4-8.5, and temperature 23-28 deg.C. When the hydraulic retention time of the reactor is 6 hours, the dissolved oxygen concentration of the mixed liquid in the reactor is controlled below 0.1 mg/L. The membrane aeration biomembrane short-cut nitrification and denitrification system can be started and stably run for 15-20 days, the effluent ammonia nitrogen is 5-10 mg/L, and the COD isCr30-50 mg/L of effluent nitrite nitrogen, 10-15 mg/L of effluent nitrate nitrogen, 15-20 mg/L of effluent nitrate nitrogen, the ammonia nitrogen removal rate can stably reach more than 95%, and under the condition of properly adding part of carbon source, the denitrification performance of the system can be further improved, and the concentrations of the effluent nitrite and the effluent nitrate can be further reduced. The process system of the present invention also exhibits a relatively high resistance to impact loading.
Claims (5)
1. The sewage treatment equipment based on biomembrane thickness in-situ control comprises a water inlet pool (1), a water inlet pump (2), a reactor (6) and a water outlet valve (10) which are sequentially connected, and is characterized in that a bubble-free aeration membrane (9) is arranged in the reactor (6), the equipment further comprises a gas pressure regulating valve (8) for regulating the oxygen partial pressure and the dissolved oxygen concentration in the membrane, one end of a component of the bubble-free aeration membrane (9) is connected to a gas pump (3) for gas inlet and displays the pressure in the membrane through a gas pressure gauge, and the other end of the component of the bubble-free aeration membrane (9) is connected to the gas pressure regulating valve (8) for gas outlet;
after the reactor (6) is inoculated with sludge, wastewater containing high ammonia nitrogen enters the reactor (6) after the pH value is adjusted in advance, and after a biofilm is formed on the surface of a bubble-free aeration membrane (9) by adjusting the partial pressure of oxygen and the concentration of dissolved oxygen in the reactor (6), an oxygen pollution substrate is diffused and transferred in the biofilm in opposite directions to synchronously carry out nitrification and denitrification;
the equipment further comprises a mixed liquid circulating pump (5), a pH meter for measuring the pH value and a dissolved oxygen measuring instrument (7) for measuring the concentration of dissolved oxygen, wherein the input end of the mixed liquid circulating pump (5) is connected with the top end part of the reactor (6), the output end of the mixed liquid circulating pump is connected into a water inlet pipeline for connecting the water inlet pump (2) and the reactor (6), the water inlet pump (2) is connected to the bottom end part of the reactor (6) through the water inlet pipeline, and the dissolved oxygen measuring instrument (7) is connected into a circulating pipeline for connecting the mixed liquid circulating pump (5) and the reactor (6); after the whole reactor (6) is filled with water, the mixed liquid circulating pump (5) is started, and then the continuous operation can be carried out;
the aeration membrane in the aeration biomembrane region adopts a tubular inorganic silica gel aeration membrane with surface modification and optimized spatial layout;
when the pressure regulating valve regulates the partial pressure of oxygen and the concentration of dissolved oxygen in the membrane, the dissolved oxygen in the reactor is ensured not to be higher than 1.0mg/L at the initial stage, and the concentration of the dissolved oxygen in the mixed solution is controlled to be lower than 0.1mg/L after a set amount of biological membrane grows on the surface of the bubble-free aeration membrane;
the device also comprises a film scraping plate (12) and an electromechanical device (11), and when the thickness of the biological film exceeds the standard, the electromechanical device (11) controls the film scraping plate (12) to scrape off redundant parts.
2. The sewage treatment equipment based on the in-situ control of the thickness of the biofilm as recited in claim 1, characterized in that the bottom of the reactor (6) is also provided with a sewage draining outlet (15).
3. The sewage treatment equipment based on biofilm thickness in-situ control of claim 1, wherein one end of the bubble-free aeration membrane (9) component is connected to an air compressor air pump inlet air, the other end of the bubble-free aeration membrane is connected to an air pressure regulating valve (8) outlet air, and the bubble-free aeration membrane (9) component adopts a top air inlet and top air outlet configuration; the device regulates and controls the air pressure in the bubble-free aeration membrane (9) through a gas pressure regulating valve (8) and a gas pressure gauge.
4. A method for controlling the apparatus according to any one of claims 1 to 3, comprising:
step S1: sludge inoculation is carried out on the reactor (6);
step S2: pre-adjusting the pH value of the wastewater containing high ammonia nitrogen to be 7.5-8.3;
step S3: starting a water inlet pump (2), and allowing the wastewater with the adjusted pH value and containing high ammonia nitrogen to enter a reactor (6);
step S4: the gas supply pressure of the membrane aeration is adjusted to gradually increase from low to high, and the dissolved oxygen in the reactor (6) is ensured not to be higher than 1.0mg/L at the initial stage;
step S5: after a set amount of biological film grows on the surface of the bubble-free aeration film (9), the electromechanical device (11) controls the film scraping plate (12) to scrape off the excessively thick biological film, the thickness of the biological film on the surface of the aeration film is controlled within a set range, and meanwhile, the dissolved oxygen concentration in the mixed solution is controlled to be lower than 0.1mg/L by adjusting the air pressure in the film;
step S6: the treated wastewater is discharged through a water outlet valve (10), and the scraped biomembrane sludge is discharged through a sewage outlet (15) arranged at the bottom of the reactor (6).
5. A method according to claim 4, characterized in that the pH of the water entering the reactor (6) is controlled at 8.
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