SK4062002A3 - Device for biologically purifying waste water - Google Patents

Abstract

The biological wastewater treatment plant with biologically removable contamination, compactly designed in one tank, is divided into an activation zone (AZ) and a separation zone (S), where the activation zone (AZ) consists of an anoxic section (AOX) and an oxic zone the section (OX), wherein the entire activation zone (AZ) is provided with partition walls (3) and an aeration system (5), which can continuously vary the size of the anoxic section (AOX) and oxic section (OX) depending on the cleaning process. The anoxic section (AOX) is supplied with a feed line (I) for supplying contaminated water, and there is also placed a submersible pump (2) with pipelines to ensure homogenization and flow guidance within circulatory activation. In the oxic section (OX), a submersible sewage pump (10) is placed for internal recirculation of the sludge between the oxic section (OX) and the anoxic section (AOX), wherein the activation zone (AZ) is connected to the separating zone (S) by the soothing line (6) which opens into the separation zone (S) and is terminated on the surface in the activation zone (AZ) by the outer ring (7) to prevent possible ingress of floating impurities. The conduit (6) is fixed to the wall (4) of the separation zone (S), is perforated along the entire length of the separation with the downward orientation of the apertures, a pump (8) with an active conduit is located at the bottom of the separation zone (S) the sludge and this conduit enters the activation zone (AZ) above the surface. The separation zone (S) comprises collecting troughs (9) leading into the tertiary filters (TF) on the tertiary purification process.

Description

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention

BACKGROUND OF THE INVENTION

In the prior art biological waste water treatment plants, the functional volumes are formed in several separate tanks. Such a solution requires increased financial demands on earthwork and construction work. Technological pipelines of such tanks tend to be long, thermally insulated, which increases the cost of their construction depending on the forced circulation as well as increased demands on machinery and technological equipment.

In more modern facilities, separation and activation is located in one common tank to form a single unit. Biological reactor is solved in tanks with longitudinal cross-section in the form of a circle. rectangle. It consists of several zones which are separated from each other by partitions. The partitions determine the fixed volumes of each zone zone: nitrification zone, denitrification zone or separation zone. The denitrification and nitrification zones are delimited and separated by partitions, while in the nitrification zone biological treatment is ensured by aerobic activation, which is carried out by means of an aeration system. The aeration system is solved centrally, i. it allows to aerate only the whole nitrification zone or only one part of it.

Separation and activation is located in one common tank to form a single unit. The most suitable separation for these devices is the fluid filtration separation with the return of the activated sludge to the activation. The separation zone consists of a settling tank usually located in the center of the biological reactor and is connected to the activation through openings for the passage of activated sludge water and for the return of activated sludge. The devices are structurally simple without separating part resp. possibilities of regulation of internal resp. external recirculation.

Waste water in such biological reactors flows into the denitrification zone, flows through the nitrification zone (s) up to the separation zone in which the purified water is separated from the sludge. Purified water flows or directly to the recipient or even to the tertiary tank (depending on its degree of contamination).

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The tertiary purification stage is mostly solved in separate tanks, which can be of different types and cross-sections. Such a solution requires increased financial demands on earthwork and construction work.

SUMMARY OF THE INVENTION

The above-mentioned deficiencies are substantially eliminated by the complex waste water treatment plant. The solution is based on the possibility of continuous regulation of the ratio of anoxic and oxic section of the activation zone of circulatory activation, the possibility of regulation of aeration intensity in individual sections, regulation of circulation activation itself, regulation of internal and external recirculation as well as their ratio and possibility of tertiary filters.

The biological treatment of all kinds of wastewater with biodegradable pollution is compactly solved in one tank, and based on studies of solutions of biological wastewater treatment plants of various companies in the world we have found that the most economically and economically advantageous concept of a biological reactor is in a circular tank. The ring is statically the most advantageous shape of the water tank and for this reason the ring tank should always be the cheapest.

The biological part of the wastewater treatment plant consists of a single cylindrical tank, in which the partition walls and the tank shell define an activation and separation zone between them, minimizing the number of technological lines, which ultimately contributes to savings in the buildings of this type of wastewater treatment plant and service and maintenance.

The essence of the complex wastewater treatment plant according to the invention consists in joining the denitrification and nitrification zones into one continuous activation zone, in which the ratio of the oxic and anoxic sections can be varied continuously according to the needs of the purification process. This greatly streamlines the process and, in addition, high nitrogen removal efficiency can be achieved by simultaneous nitrification and denitrification. In addition, such a solution can be operated without primary sedimentation and with aerobic sludge stabilization, even for large wastewater sources.

Waste water flows into the anoxic zone, where pumps are continuously mixed and homogenized with return sludge from external recirculation and at the same time the flow of waste water is ensured during circulation activation. The homogenized mixture flows through the continuous anoxic zone into the oxic zone. In the oxic zone, biological purification is performed by aerobic activation, i. with the aeration system there is a need for tttt, which is needed. oxygenation with a mixture of water and sludge. In the activation zone, a so-called flow is provided by means of directed flow and partitions. circulatory activation, which streamlines the biological process of water purification.

Water flows into the separation zone through a calming line, the inlet of which is connected to the surface in the activation zone and is protected by a ring which prevents any floating contaminants from entering the separation. Before entering the feed line from the activation zone into the separation, it is divided into two branches, which are fixed to the walls of the separation zone, and are perforated along the entire length with the perforation orientation downwards. Counterflow sedimentation separates the sludge from purified water. By design of a separator in the form of a truncated perpendicular pyramid with a rectangular base, it is ensured that the sludge sediments into a dedicated sedimentation focus, from where it is sucked back to the anoxic section of the activation zone by at least one pump. external recirculation.

Since the built-in separation device does not utilize the fluid cloud cleaning process, the pump can be placed directly in the separation focus, thereby eliminating unnecessary piping and hence the cost thereof.

As part of the design of a compact integrated biological reactor, it is also possible to include the so-called. tertiary filters, which are used depending on the specified output values respectively. on the required parameters of purified water.

The internal recirculation of sludge is ensured by the actual activation of the waste water by means of a submersible sludge pump. External recirculation is provided as described above. The relationship between internal (resulting from circulation activation) and external recirculation is influenced by the regulation of pump operation. By optimizing the device, i. By minimizing the total volume and maintaining a sufficient concentration of the purifying microorganisms in the activation tank, the recirculation ratio between internal (resulting from circulatory activation) and external recirculation 2: 5 must be maintained.

/ images in drawings

Examples of embodiments of the device according to the invention are shown in two drawings. 1 shows a vertical longitudinal section of the device and FIG. 2 is a plan view.

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DETAILED DESCRIPTION OF THE INVENTION

In terms of device optimization, i. to minimize the total volume and to maintain a sufficient concentration of purifying micro-organisms (“biomass”) in the inactivation tank necessary to remove nitrogen contamination (mainly NH / resp. NO3 ') the recirculation ratio of external recirculation to internal recirculation of 2: 5 must be respected.

After removal of mechanical impurities and sand, the waste water is fed into the anoxic section of the AOX activation zone AZ via line 1. This section is non-aerated and serves for the development of anaerobic bacteria for simultaneous nitrate degradation. Submersible pump 2 with piping directs the flow within the circulation activation. This ensures perfect mixing (homogenization) of the activated sludge from the external recirculation (from the separation zone S), from the internal recirculation with the incoming waste water. The waste water then flows through the oxic section of the OX activation zone AZ. In the activation zone AZ, the waste water flow is directed through the submersible pump 2 and the crossbars 3 so that the activation process is as efficient as possible. The ratio of the aerated and non-aerated part of the activation zone AZ can be continuously changed and controlled by controlling the air supply resp. completely stopping it in the waste water flow process during the circulation activation as required by the purification process. The internal sludge recirculation is ensured by the operation of the Ifl submersible sludge pump, which pumps the waste water between the oxic section OX and the anoxic section AOX of the activation zone AZ as necessary.

The activation zone AZ is connected to the separation zone S via a quench line 6 which flows into the separation zone S and its inlet part terminates at the level in the activation zone AZ and protected by an outer ring 2 to prevent possible ingress of floating contaminants.

The quench line 6 is fastened to the separation wall 4 and is perforated along the entire length of the separation with the openings facing downwards.

The separation zone S is formed by a system of partition walls 4 within the treatment plant and serves to separate the biological active sludge from the purified water by countercurrent sedimentation. The construction of the separating zone S in the form of a truncated perpendicular pyramid with a rectangular base ensures sedimentation of the sludge to the separation point, where its recirculation is ensured by at least one pump 8 with piping which sucks the active sludge from the bottom of the separation space.

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Purified water is discharged through collecting troughs 2 to tertiary IE filters, which partially substitute the tertiary purification process. After passing through the tertiary filters TF, purified water flows out of the biological waste water treatment plant.

Industrial usability

The device according to the invention has application in the construction of WWTP. It reduces the demands on earthworks, construction work, distribution, insulation and technological equipment, but also on the operation and maintenance of WWTP. Its constructional and positional arrangement minimizes the necessary space necessary for the construction of the WWTP, thus contributing to the reduction of economic demands during construction and ensuring the quality of purified water.

At the same time, by providing the possibility of continuously regulating the ratio of aerated and non-aerated part of the activation zone together with the inclusion of circulation activation, it makes the whole process more effective. By integrating and utilizing tertiary filters, the plant comprehensively solves the biological wastewater treatment process in one compact unit.

Claims (1)

A biological wastewater treatment plant with biodegradable pollution, compactly designed in a single tank, characterized in that it is divided into an activation zone (AZ) and a separation zone (S), where the activation zone (AZ) consists of an anoxic section ( AOX) and oxic section (OX), where the entire activation zone (AZ) is equipped with partition walls (3) and aeration system (5), which can be continuously resized by anoxic section (AOX) and oxic section (OX) depending on in the anoxic section (AOX), an inlet pipe (1) for the polluted water inlet and also a submersible pump (2) with piping to provide homogenization and flow control within the circulation activation, in the oxic section (OX) ) a submersible sludge pump (10) for internal sludge recirculation is placed between the oxic section (OX) and the anoxic section (AOX), the activation zone (AZ) being connected having a separation zone (S) via a calming line (6) which flows into the separation zone (S) and terminates at the level in the activation zone (AZ) by an outer ring (7) to prevent possible ingress of floating contaminants; fastened to the wall (4) of the separation zone (S), which is perforated along the entire length of the separation with the openings facing downwards, where a pump (8) with a piping is located at the bottom of the separation zone (S), it opens into the activation zone (AZ) above the surface, the separation zone (S) comprises collecting troughs (9) leading to tertiary filters (TF) for the tertiary purification process.