CN103030229B - Oily wastewater treatment device and treatment method in steel industry - Google Patents
Oily wastewater treatment device and treatment method in steel industry Download PDFInfo
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Abstract
The invention discloses an oily wastewater treatment device and an oily wastewater treatment method in a steel industry. The oily wastewater treatment device is arranged between a regulating tank and a treatment water tank, and the oily wastewater is preliminarily stayed in the regulating tank and then fed to a primary reaction flocculating tank; a coagulant and a coagulant aid medicament are fed into the primary reaction flocculating tank, and sodium hydroxide is fed according to the pH value of water; the oily wastewater successively enters a secondary reaction flocculating tank through a cavitation-aeration air floatation device; the coagulant and the coagulant aid medicament are fed into the secondary reaction flocculating tank, and sodium hydroxide is also fed according to the pH value of the water quality; and the oily wastewater successively enters a sedimentation tank, the overflowing clear water enters a third reaction flocculating tank, the coagulant and the coagulant aid medicament are fed into the third reaction flocculating tank, the sodium hydroxide is fed according to the PH value of the water quality, effluent enters a pressurized floating tank for the air flotation and deoiling treatment again and the purified water flows into the treatment tank. The oily wastewater treatment device and the oily wastewater treatment method in the steel industry are applied to recycling the oily wastewater in the field of the oily wastewater produced in the steel production industry, and have a remarkable effect on saving water resources.
Description
Technical field
The present invention relates to a kind of oil-containing waste water treating device and processing method thereof, the oily(waste)water particularly relating to a kind of various sources produced in its production process for steel industry carries out a kind of device of processing and processing method thereof.
Background technology
At present, oily(waste)water is defined as the waste water referred to containing pollution by oil material, and especially in the production process of iron and steel, will produce all kinds of oily(waste)water in a large number, these waste water mainly come from the process flows such as breaking down, hot rolling, continuous casting, machine maintenance and oil cellar.And pollution by oil material usually exists with three kinds of states in waste water:
(1) floatingly oil, oil droplet size is greater than 100 μm, is easy to separate from waste water.
(2) dispersed oil. oil droplet size, between 10-100 μm, suspends in water.
(3) oil in water emulsion, oil droplet size is less than 10 μm, in emulsified state, not easily separates from waste water.
And the oily(waste)water of steel industry also covers above three kinds of state oily substances substantially, in addition, because oily(waste)water is from each operations such as breaking down, hot rolling, continuous casting, machine maintenance and oil cellars, directly results in oil-containing degree greatly different, simultaneously originate the water yield also time large time little, the difficulty dealt with is larger.
And under prior art, for in the treatment process of oily(waste)water, there is method oily(waste)water processed by the method for multi-grade oil water separator, the technical characteristics of the method is as described below: first carry out an oily water separation, the water outlet of oily-water seperating equipment enters pressurized dissolved air flotation pond, then carries out secondary oily water separation: the water outlet of air flotation pool is sent into oily-water seperating equipment and carried out oily water separation.
Although this technology can process oily(waste)water, its processing speed is comparatively slow, and treatment cycle is longer, cannot tackle large batch of oily(waste)water.
Also have under prior art and adopt air supporting to be combined advanced treatment process to oily(waste)water with membrane technique, the technical characteristics of the method is as described below: first adopt dissolved air flotation process to dispose of sewage, the product water obtained adopts ultrafiltration membrane treatment system and reverse osmosis treatment system to carry out deep purifying again.
Although this technology also can process oily(waste)water, its for oily(waste)water composition comparatively fixing, once oily(waste)water composition is unstable, as pollution by oil material kind comparatively disperse when, its processing power is had a greatly reduced quality.
Also have in addition and adopt electricity flocculation, the way oil removing of electro-flotation and suspended substance, method degradation of organic substances removing COD with ozone ultrasonic oxidation, thus solve the process problem of oily(waste)water, make the oily(waste)water stably reaching standard after process.
But, under above-mentioned several prior aries for the treatment process containing waste water, but for the oiliness sewage treatment of steel industry, seem helpless, mainly due to the oily(waste)water of steel industry possess in enormous quantities, composition is unstable, and the feature of source in discontinuity, use the process carrying out oily(waste)water of above method to have very large difficulty, waste time and energy, and processing efficiency and effect all undesirable.
Summary of the invention
In order to the oily wastewater treatment method solved under prior art cannot tackle that steel production industry produces oily(waste)water in enormous quantities, composition is unstable, and the feature of source in discontinuity, the invention provides a kind of oil-containing waste water treating device and treatment process thereof of steel industry, the various oily wastewater treatment methods existed under which overcoming current prior art cannot in enormous quantities, high density, and the deficiency of the oiliness sewage treatment ability of source in discontinuity, can process to steel production enterprise oily(waste)water, waste water after major part process is recycled as reuse water, reduce environmental pollution.
Of the present invention specifically described in Details as Follows:
An oil-containing waste water treating device for steel industry, comprises adjustment tank and process tank, it is characterized in that:
A set of oil-containing waste water treating device is provided with between described adjustment tank and process tank.
First oily(waste)water enters adjustment tank, and adjustment tank, as a kind of based process equipment, arranges a Hand-operated butterfly valve at its water inlet manifold place, can control its flooding quantity, prevents flooding quantity instantaneous excessive and cause adjustment tank excessive.The Main Function of adjustment tank is by the sedimentation of partial suspended thing and larger floating of skim particle oils.Adjustment tank is provided with Sand pump, the macrobead suspended substance that may contain in oily(waste)water, deposit in adjustment tank, scum silica frost storage tank is pumped into by this, also oil suction pump is provided with at the afterbody of adjustment tank, being arranged on the oil collection plate inhaled on sand device scrapes to oil suction pump suction port by top oil slick, sends into floating upper oil supply tank, then deliver to waste oil regeneration device processes by the floating shifting pump that oils by oil suction pump.
And process the storage receptacle of tank as the water inflow after oil-containing waste water treating device process of the present invention, pH meter is provided with in tank, Real-Time Monitoring can be carried out to water quality, owing to eliminating most of impurity and most oil content to the water in process tank, can recycle, process tank also serves the effect of regulating pondage, be provided with process water conveying pump in exit and provide regenerated recycle-water to water channel pipe network, also pressure pump is provided with in addition at process tank, send water a part of in process tank back to pressure air-dissolving tank, remake air supporting after dissolving in air to use.A upflow tube is also provided with in process tank, can by unnecessary water yield overflow discharge.
Described oil-containing waste water treating device comprises first order reaction flocculation tank, cavitation aeration air-floating apparatus, second order reaction flocculation tank, settling tank, third order reaction flocculation tank, groove on Pressurized flotation, scum silica frost treatment system and medicine system, it is specially, one end of first order reaction flocculation tank is connected with pipeline between adjustment tank, the other end then with cavitation aeration air-floating apparatus, second order reaction flocculation tank, settling tank, third order reaction flocculation tank and groove on Pressurized flotation in order pipeline are connected, on Pressurized flotation, groove is last is connected with process tank again, scum silica frost treatment system then in addition respectively with adjustment tank, cavitation aeration air-floating apparatus, settling tank is connected with barrel road on Pressurized flotation, medicine system then respectively with first order reaction flocculation tank, second order reaction flocculation tank is connected with third order reaction flocculation tank pipeline.
The function of each equipment is as described below above:
1) first order reaction flocculation tank, after waste water enters first order reaction flocculation tank, precipitates as early as possible for the ease of the suspended substance in water, needs at this region dosing coagulant and coagulant aids.After in coagulant dosage to water, with the impurity in water by flocculate and bridging action generates macrobead throw out.In order to obtain better flocculating effect, also need to add a certain amount of coagulant aids, to improve the effect of coagulation.Also according to water quality situation, a certain amount of NaOH can be added, regulate the pH value of waste water.On first order reaction flocculation tank, machine mixer is installed, by churned mechanically effect, accelerates medicament and react with impurity in water.
2) cavitation aeration air-floating apparatus, cavitation aeration air-floating apparatus is the nucleus equipment in present treatment technique, cavitation aeration air-floating apparatus is primarily of aeration zone, air flotation zone, scrape a few part composition such as slag system and water exhaust system, its principle of work is as follows: first raw sewerage enters the aeration zone that Cavltation aerator is housed, this district is provided with aerator, in water, a vacuum zone is defined by the fast rotational of the hollow impellers of bottom, air now on the water surface is pumped under water by hollow pipeline, and under the shearing force of bottom impeller fast rotational generation, air is ground into microbubble, pollutent in microbubble and sewage organically combines, rise to liquid level.Reaching liquid level after stain thing just relies on these microbubbles support and maintain on the water surface, and by slag scraper, scum silica frost is linked into mud receiving tank, the water after process flows to next procedure by overflow groove.
The waste water of the tiny alumen ustum formed after primary first-order equation groove hybrid reaction flows into distribution reservoir, forms large alumen ustum enter cavitation aeration air-floating apparatus with coagulant aids after mixing, and water outlet flows into second order reaction flocculation tank.Scum silica frost after treatment and sediment send into slag chute by slag scraper and sludge pump respectively, then send sludge dewatering equipment process.
3) second order reaction flocculation tank, the effect of second order reaction flocculation tank is identical with first order reaction flocculation tank, at this region dosing coagulant and coagulant aids.In order to make medicine and waste water have enough stop mixing times wherein, can diaphragm be set, to improve reaction effect in two is anti-.In two is anti-, first add coagulating agent, sodium hydroxide, after stirring, add coagulant aids again, flow into radiation type precipitation pool subsequently and be for further processing.
4) settling tank, the waste water after coagulation enters containing oil sump by open channel of intaking from settling tank central part, in settling tank, carry out natural sedimentation.Water inlet pipe directly stretches center, pond, through tubular water-dispensing cover, water is flowed, because water-carrying section progressively expands to fan beam flow path direction to surrounding to surrounding radially by bottom, the flow velocity of water, from becoming more and more greatly, can make solid particulate in water progressively precipitate.More clear liter waterborne is as circular water leg, and flow out through effluent trough, silt lodging is at the bottom of pond.Settling tank is provided with one, collection mud device, scrapes the silt being deposited on bottom to central authorities.Be provided with two sludge pumps bottom settling tank, the mud precipitated is entered scum silica frost storage tank.
5) third order reaction flocculation tank, it is identical that effect and the I and II of third order reaction flocculation tank react flocculation tank, at this region dosing coagulant and coagulant aids.In order to make medicine and waste water have enough stop mixing times wherein, can diaphragm be set, to improve reaction effect in three is anti-.In three is anti-, first add coagulating agent, sodium hydroxide, after stirring, add coagulant aids again, flow into groove on Pressurized flotation subsequently and be for further processing.
6) groove on Pressurized flotation, the water after settling tank process enters groove on Pressurized flotation, and on Pressurized flotation, groove is finally processed still residual small portion impurity by pressure air-dissolving air-float method.
Its method is beaten to dissolving inlet channel by pressure pump by process water, after the pressurized air that pressurized water and air compressor machine are sent here mixes, enters dissolving here.In dissolving, centre is divided into two parts (water entering section and outlet part) by one piece of dividing plate, is provided with water inlet pipe and rising pipe.Rising pipe is provided with outlet valve, is provided with vent valve and safety valve at dissolving top, be provided with liquidometer in dissolving side, controlled the switching motion of outlet valve, vent valve by water level signal in tank.
When from outlet valve air-water mixture out, through reducing valve energy dissipating, reduce to normal pressure, enter release case, air supporting release case to be placed on Pressurized flotation trench bottom by ingress, is formerly now discharged suddenly by the air compressed, form small bubbles, impurities in water and oil content are brought to the water surface, and the scum silica frost floated up is scraped into scum silica frost storage tank by the slag scraper that recycling is located at floating upper groove top, reaches deimpurity object.By receiving mud device in air flotation pool, removing deposition mud, reduces the clear mud number of times of air flotation pool.
According to the oil-containing waste water treating device of a kind of steel industry of the present invention, it is characterized in that, described scum silica frost treatment system comprises scum silica frost storage tank, tempering tank and centrifugal drier, it is specially, scum silica frost storage tank is connected with barrel road on adjustment tank, cavitation aerating apparatus, settling tank and Pressurized flotation, and tempering tank is then arranged on the pipeline between scum silica frost storage tank and centrifugal drier.
Above-mentioned scum silica frost treatment system by containing groove on the Sand pump of the sludge pump of oil sump, adjustment tank, cavitation aerating apparatus and Pressurized flotation air flotation pool scrapes slag, mud and scum silica frost are sent into scum silica frost storage tank by mud scraper, inside be provided with stirrer in case mud deposits wherein, be provided with two table flotation slags at scum silica frost storage tank to raise and send pump, according to the liquid level automatic start-stop in scum silica frost storage tank.
Scum silica frost is raised and is sent pump to deliver in tempering tank by scum silica frost, and send into two centrifugal driers after adding coagulant aids (PHP) stirring and carry out processed, tempering tank is provided with overflow plate, as too large in entered mud amount, is back to scum silica frost storage tank by overflow plate.Scum silica frost after dehydration is admitted to the scum silica frost hopper being positioned at water extracter bottom.
According to the oil-containing waste water treating device of a kind of steel industry of the present invention, it is characterized in that, described medicine system is specially the adjustable volume pump of one-stroke, medicament storage tank and connecting pipeline thereof.
Medicine system, oil-containing wastewater system need add three kinds of medicaments altogether in treating processes: coagulating agent PAC, coagulant aids PHP, water quality survey agent NaOH), three kinds of medicaments add respectively once, secondary and third order reaction flocculation tank.Mainly play the object making impurity flocculation sediment in water and regulating water quality.The injection device of medicine used is the adjustable volume pump of stroke.Simultaneously NaOH need first after thin up again row add, NaOH add can according to one anti-, two anti-, three anti-in pH value feedback signals control.The keying of PHP and PAC injection pump can send pump chain with raising, and namely raises when sending pump startup, then one anti-, two anti-, three anti-PAC, PHP pumps then start simultaneously, and stroke can manual regulation.
According to the oily wastewater treatment method of a kind of steel industry of the present invention, it is characterized in that:
Described oily wastewater treatment method is as follows: first oily(waste)water arrives adjustment tank preliminary retention, in the retention period, Large stone oil droplet floats naturally, by oil skimming belt, surperficial oil slick is siphoned away, then, send pump that the oily(waste)water of preliminary treatment is delivered to first order reaction flocculation tank by raising, by medicine system dosing coagulant and coagulant aids medicament in first order reaction flocculation tank, and add NaOH according to the pH value of water quality, subsequently through cavitation aeration air-floating apparatus, this device passes through aerator, air is made to pump in water by hollow pipeline, form micro-bubble, olesome in water is combined, float to liquid level, and by slag scraper, impurity is got rid of, after this procedure, enter again second order reaction flocculation tank, by medicine system dosing coagulant and coagulant aids medicament, and add NaOH according to the pH value of water quality, enter settling tank subsequently, suspended particulate in water settles down gradually in settling tank, clear water is overflowed by cofferdam, the clear water overflowed enters third order reaction flocculation tank, by medicine system dosing coagulant and coagulant aids medicament, and add NaOH according to the pH value of water quality, water outlet enters groove on Pressurized flotation, again carry out oil removal by air bubbling process, upper strata scum silica frost sends into scum silica frost treatment system after slag scraper is discharged, and the water after purification flows into process tank, major part is sent to pipe network as regenerated recycle-water, and be back to groove utilization on Pressurized flotation as pressure air-dissolving water after having a small amount of water to add pressurized air by dissolving.
The oil-containing waste water treating device of a kind of steel industry of the present invention and treatment process thereof is used to obtain following beneficial effect:
1. by a kind of oil-containing waste water treating device of steel industry of the present invention and the enforcement for the treatment of process thereof, effectively can process all kinds of oily(waste)waters of steel industry, carried out deoiling process, and process water is recycled, for saving water resource, be there is significant effect.
2. the oil-containing waste water treating device of a kind of steel industry of the present invention and disposal methods technique simple, technical scheme is advanced, has the effect of energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is the schema of the oil-containing waste water treating device of a kind of steel industry of the present invention and the concrete device distribution for the treatment of process and treating processes.
Embodiment
Below in conjunction with drawings and Examples, the oil-containing waste water treating device of a kind of steel industry of the present invention and treatment process thereof are further described.
Embodiment
As shown in Figure 1, oily(waste)water is introduced into adjustment tank 1 and carries out natural sedimentation, and surperficial oil slick sends into floating upper oil supply tank through oil-collecting collection device; Body refuse then sinks at the bottom of pond, sends into the scum silica frost storage tank A71 of scum silica frost treatment system A7 through mud-sucking device.
Water outlet is by raising the first order reaction flocculation tank A1 sending and be pumped into oil-containing waste water treating device A, in first order reaction flocculation tank, oily(waste)water is by medicine system A8 dosing coagulant PAC, coagulant aids PHP, water quality survey agent NaOH, hybrid reaction is carried out under stirrer stirs, reach first order reaction flocculation tank exit and progressively form thick alumen ustum, under run by gravity effect, enter cavitation aeration air-floating apparatus A2.In the aerated space of cavitation aeration air-floating apparatus, squeeze into highdensity micro-bubble by aerator in water, the foreign material in water are combined, and together float at air supporting region micro-bubble and foreign material, and are entered scum silica frost storage tank A71 by scraping slag equipment.The water outlet of cavitation aeration air-floating apparatus enters second order reaction flocculation tank A3, in second order reaction flocculation tank, oily(waste)water is by medicine system dosing coagulant PAC, coagulant aids PHP, water quality survey agent NaOH, hybrid reaction is carried out under stirrer stirs, reach second order reaction flocculation tank exit and progressively form tiny alumen ustum, under run by gravity effect, enter in the central tube of settling tank A4 of oily(waste)water along open channel.
The oily(waste)water entered in the central tube of the settling tank A4 of oily(waste)water carries out radiation formula precipitation by center to periphery, sludgd deposition is in bottom, under the collection mud rake effect of running, scrape in settling tank conical lower portion hole, drain into scum silica frost storage tank A71 by the sludge pump be arranged in vault, supernatant water peripherally water outlet crest of weir drops in annular collecting vat, third order reaction flocculation tank A5 is entered through open channel under run by gravity effect, by medicine system A8 dosing coagulant PAC in third order reaction flocculation tank, coagulant aids PHP, water quality survey agent NaOH, water outlet enters the oily(waste)water of groove A6 on Pressurized flotation under the bubble discharged by dissolving, oil-in-water part and particulate adhere to bubble and are progressively formed on scum silica frost and bubble through the water column, under slag scraper running, scraped to scum silica frost storage tank by scraper plate, go out current then to process tank 2, process conveying pump force feed is to serial connection reuse water pipeline, carry out regeneration, and be back to groove utilization on Pressurized flotation as pressure air-dissolving water after having a small amount of water to add pressurized air by dissolving.And scum silica frost is promoted to tempering tank A72 by scum silica frost pump in scum silica frost storage tank, forms thick alumen ustum through adding coagulant aids and enter centrifuge A73 under stirrer stirs, carry out processed.
The oil-containing waste water treating device of a kind of steel industry steel industry of the present invention and treatment process thereof be particularly useful for process steel production industry produce oily(waste)water field, oily(waste)water for this type is in enormous quantities, composition is unstable, and the feature of source in discontinuity, deoiling is processed, and process water is recycled, for saving water resource, there is significant effect, there is the effect of energy-conserving and environment-protective.
Claims (1)
1. an oily wastewater treatment method for steel industry, the oily wastewater treatment method of described steel industry comprises with adjustment tank (1) and process tank (2), it is characterized in that:
The oil-containing waste water treating device (A) of a set of steel industry is provided with between described adjustment tank (1) and process tank (2);
The oil-containing waste water treating device (A) of steel industry comprises first order reaction flocculation tank (A1), cavitation aeration air-floating apparatus (A2), second order reaction flocculation tank (A3), settling tank (A4), third order reaction flocculation tank (A5), groove (A6) on Pressurized flotation, scum silica frost treatment system (A7) and medicine system (A8), it is specially, one end of first order reaction flocculation tank is connected with pipeline between adjustment tank (1), the other end then with cavitation aeration air-floating apparatus, second order reaction flocculation tank, settling tank, third order reaction flocculation tank and groove on Pressurized flotation in order pipeline are connected, on Pressurized flotation, groove is last is connected with process tank (2) again, scum silica frost treatment system then in addition respectively with adjustment tank, cavitation aeration air-floating apparatus, settling tank is connected with barrel road on Pressurized flotation, medicine system then respectively with first order reaction flocculation tank, second order reaction flocculation tank is connected with third order reaction flocculation tank pipeline,
Described scum silica frost treatment system (A7) comprises scum silica frost storage tank (A71), tempering tank (A72) and centrifugal drier (A73), it is specially, scum silica frost storage tank is connected with groove (6) pipeline on adjustment tank (1), cavitation aeration air-floating apparatus (A2), settling tank (A4) and Pressurized flotation, and tempering tank is then arranged on the pipeline between scum silica frost storage tank and centrifugal drier;
Described medicine system (A8) is specially the adjustable volume pump of one-stroke, medicament storage tank and connecting pipeline thereof;
The concrete steps of the oily wastewater treatment method of the oil-containing waste water treating device of described steel industry are as described below:
First oily(waste)water arrives adjustment tank (1) preliminary retention, in the retention period, Large stone oil droplet floats naturally, by oil skimming belt, surperficial oil slick is siphoned away, then, send pump that the oily(waste)water of preliminary treatment is delivered to first order reaction flocculation tank (A1) by raising, by medicine system (A8) dosing coagulant and coagulant aids medicament in first order reaction flocculation tank, and add sodium hydroxide according to the pH value of water quality, subsequently through cavitation aeration air-floating apparatus (A2), this device passes through aerator, air is made to pump in water by hollow pipeline, form micro-bubble, olesome in water is combined, float to liquid level, and by slag scraper, impurity is got rid of, after this procedure, enter again second order reaction flocculation tank (A3), by medicine system dosing coagulant and coagulant aids medicament, and add sodium hydroxide according to the pH value of water quality, enter settling tank (A4) subsequently, suspended particulate in water settles down gradually in settling tank, clear water is overflowed by cofferdam, the clear water overflowed enters third order reaction flocculation tank (A5), by medicine system dosing coagulant and coagulant aids medicament, and add sodium hydroxide according to the pH value of water quality, water outlet enters groove on Pressurized flotation (A6), again carry out oil removal by air bubbling process, upper strata scum silica frost sends into scum silica frost treatment system (A7) after slag scraper is discharged, and the water after purification flows into process tank (2), major part is sent to pipe network as regenerated recycle-water, and be back to groove utilization on Pressurized flotation as pressure air-dissolving water after having a small amount of water to add pressurized air by dissolving.
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| CN107324561A (en) * | 2017-08-30 | 2017-11-07 | 丹阳市百盛电器有限公司 | A kind of plasma water treatment device and method for treating water of simple Coal Tar Wastewater |
| CN109365512B (en) * | 2018-10-23 | 2023-06-23 | 河北工业大学 | Method for mobile rapid elution of petroleum-polluted soil |
| CN113754187A (en) * | 2021-09-03 | 2021-12-07 | 石横特钢集团有限公司 | Advanced treatment and recycling process for wastewater of iron and steel enterprises |
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| 隔油/气浮/两段生化法处理炼油厂含油废水;韩国义等;《中国给水排水》;20100131;第26卷(第02期);第64-67页 * |
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