WO2020133553A1 - Method for treating high ammonia-nitrogen wastewater of the coal chemical industry with reinforced sbr process pool - Google Patents

Abstract

The present application belongs to the field of industrial wastewater treatments, and relates to a method for treating wastewater of the coal chemical industry, specifically a method for treating high ammonia-nitrogen wastewater of the coal chemical industry with a reinforced SBR process pool. The method involves (1) controlling and adjusting the indicators of water quality in an adjusting pool: an ammonia nitrogen concentration, a COD concentration, an alkalinity and a C:N ratio; (2) adjusting the dissolved oxygen degree, a high inlet water load, and sludge concentration of the SBR pool, wherein the sludge concentration is determined according to the water quality conditions of the high ammonia-nitrogen wastewater of the coal chemical industry and the season; (3) alternatively charging the SBR pool with water, using a sequence batch reactor, and flowing the effluent water back into the adjusting pool through a return pipe, wherein the amount of the water flowed back is determined according to the concentration of the high ammonia-nitrogen wastewater of the coal chemical industry; and (4) adjusting the inlet and outlet valves of a circulating water pump on the SBR pool, so as to adjust the mixing degree of sludge, water and oxygen in the pool and to adjust the dissolved oxygen efficiency.

Description

Method for strengthening SBR process pool to treat coal chemical industry high ammonia nitrogen wastewater Technical field

The present application belongs to the field of industrial wastewater treatment, and relates to a method for treating coal chemical wastewater, in particular to a method for treating high ammonia nitrogen wastewater in coal chemical industry by using enhanced SBR process pool.

Background technique

Coal chemical wastewater refers to production wastewater generated during various coal processing processes, including coking wastewater, coal gasification wastewater, coal-to-oil wastewater, and synthetic wastewater. The water quality of this type of wastewater is extremely complex, containing toxic, refractory substances such as phenols, alkanes, polycyclic aromatic hydrocarbons, ammonia nitrogen, etc. It is a typical industrial wastewater that is difficult to biodegrade. For a long time, high concentration of ammonia nitrogen has been a big problem in industrial wastewater. The main reasons are the contradiction of the following two aspects. On the one hand, the pollutants in coal chemical wastewater are highly toxic and the concentration of pollutants is high, which inhibits the growth of nitrifying bacteria, and It is extremely easy to be inhibited by sludge material and the nitrification ability is reduced. On the other hand, the treatment of this part of wastewater has a high content of non-degradable sludge, and the aerobic bacteria treatment cycle is long, resulting in a change in the structure of the bacterial community is not conducive to the reproduction of nitrifying bacteria.

The coal chemical wastewater treated by the AO method and oxidation ditch method has achieved good organic pollutant removal effect, but the AO and oxidation ditch method has poor impact resistance and is often poisoned by the influent pollutants, which greatly reduces the ammonia nitrogen removal rate. Even the ammonia nitrogen in the effluent exceeds the standard. Due to the improvement of environmental protection standards, the discharge standards of coal chemical wastewater have been increased accordingly. Due to the influence of coal quality changes, production process adjustments, and biochemical system fluctuations, AO and oxidation ditch methods are difficult to achieve organic pollutants and Efficient removal of ammonia nitrogen. In recent years, although the newly introduced anaerobic ammonia oxidation technology has been used and researched and applied in urban sewage treatment plants, due to the severe environmental requirements of anaerobic ammonia oxidation'protagonist'-Rhodobacter, coal chemical wastewater is complicated and high The concentration makes it difficult to adapt and survive the dominant strain Rhodobacter with special needs. The unique operating mode of the SBR method can alternately carry out aerobic, anoxic and anaerobic reaction environments in the same reaction tank. A variety of bacterial groups coexist in the tank, and the number and structure of the bacterial groups create a strong impact resistance and The ability to degrade toxic and harmful substances. At present, the SBR process is used in more and more coal chemical enterprise projects. It is worth noting that the simple SBR process control cannot meet the treatment requirements of coal chemical wastewater in terms of influent load and impact resistance. Therefore, the use of concise and efficient technical means to enhance the high ammonia nitrogen treatment capacity of the SBR process is a new development direction in the field of coal chemical wastewater biological treatment technology.

Summary of the invention

In order to solve the above problems, this application provides an enhanced SBR process tank to treat coal chemical industry high ammonia nitrogen wastewater. This application is achieved through the following scheme:

A device for strengthening SBR process pool to treat high ammonia nitrogen wastewater of coal chemical industry includes a regulating tank, an SBR pool group and a storage tank connected in sequence through a pipeline. The SBR pool group includes at least two SBR pools, and the SBR pools are connected in parallel The storage tank is connected to the adjustment tank through a return pipe, a return pump is provided on the return pipe, a coal chemical production and domestic wastewater inlet pipe is provided on the adjustment tank, and an online ammonia nitrogen analysis instrument is provided in the adjustment tank The SBR tank is equipped with an online dissolved oxygen instrument. The online dissolved oxygen instrument is connected to an aeration device, and a matching fan is provided on the aeration device.

A method for enhancing the treatment of high ammonia nitrogen wastewater in coal chemical industry by the SBR process tank, (1) controlling the indicators of the water quality in the adjusting tank: ammonia nitrogen concentration, COD concentration, alkalinity and C:N ratio; (2) adjusting the dissolved oxygen level of the SBR tank, High influent load and sludge concentration, the sludge concentration is determined according to the water quality conditions and seasons of coal chemical industry high ammonia nitrogen wastewater; (3) SBR tank uses sequential batch reactors to alternately enter water, and the effluent returns to the regulating tank through the return pipe. The water volume is determined according to the concentration of high ammonia nitrogen wastewater in coal chemical industry; (4) By adjusting the inlet and outlet valves of the circulating water pump on the SBR tank, the mixing degree of sludge, water and oxygen in the tank is adjusted to adjust the dissolved oxygen efficiency.

Preferably, the ratio of the water output of the SBR tank to the volume of the coal chemical wastewater in the adjusting tank is 1/6-4/3.

Preferably, the upper limit of the dissolved oxygen in the SBR tank is 2.0 mg/L, and the control of low dissolved oxygen is achieved by the on-line dissolved oxygen instrument and aeration device in the SBR tank.

Preferably, the sludge age of the sludge in the SBR pool is 5-40 days, and the residence time of the sludge volume in the SBR pool is controlled by the discharge amount of the remaining sludge in the SBR pool.

Preferably, the ammonia nitrogen concentration of the water in the adjustment tank is 300 mg/L, and the ammonia nitrogen concentration can be controlled by adjusting the ratio of coal chemical high ammonia nitrogen wastewater and SBR effluent through an online ammonia nitrogen analysis instrument.

Preferably, the COD concentration of the pool water in the regulating tank is lower than 1200mg/L, and the C:N ratio is 4; by manual analysis, the amount of alcohol-containing wastewater in the regulating tank is adjusted; COD, stabilizing the ratio of ammonia nitrogen, COD and C:N in the tank to keep the water in the SBR tank stable; the SBR tank controls the dissolved oxygen value in the SBR tank in real time through the synergy of the aeration device, fan and online dissolved oxygen instrument.

Preferably, the alkalinity in the adjustment tank is lower than 1000 mg/L, and the alkalinity of the adjustment tank is controlled at a required value by adjusting the amount of liquid alkali added.

Preferably, the aeration amount in the SBR pool refers to the size of the aeration amount in the pool is changed by the opening of the intake valve in the SBR pool and the frequency conversion frequency of the fan, the continuous aeration is used to control the aeration mode, the aeration amount is 70m ³ / min-80m ³ /min.

Preferably, the sludge concentration in the SBR tank is 3500-5500 mg/L; the preferred winter sludge concentration is 5000-5500 mg/L, and the summer sludge concentration is 3500-4000 mg/L.

Preferably, the hydraulic retention time of the SBR pool is 6-8h, the hydraulic retention time is adjusted according to the change of the inlet water load, the inlet water load is stable, the residence time is 6 hours, the inlet water increases and fluctuates, and the online dissolved oxygen value does not reach 2mg/ L, extend the residence time according to the dissolved oxygen value until the effluent is qualified.

Preferably, the ammonia nitrogen concentration of the adjustment tank is adjusted through the backflow water from the storage tank.

The beneficial effects of the present application: The present invention is to strengthen the ammonia nitrogen treatment efficiency of coal chemical industry high ammonia nitrogen wastewater with multi-effect adjustment tank and SBR tank, and at the same time promote the decomposition of toxic high concentration refractory organic matter, thereby helping to expand the SBR process in coal chemical industry. Practical application in ammonia nitrogen wastewater treatment. The feature of the present invention is to utilize the multi-bacterial structure of the multifunctional reaction tank and sequential batch processor in the SBR tank and the advantages of the strong impact resistance of the SBR tank. The adjustment of the effect adjustment tank alternately performs sequential batch-type wastewater treatment on multiple groups of SBR tanks. The SBR tank has low oxygen, high sludge concentration and low sludge age to resist the efficient degradation and removal of ammonia nitrogen in coal chemical industry high concentration ammonia nitrogen wastewater. The invention has the advantages of strong resistance to load impact, high ammonia nitrogen removal efficiency, and low operating cost.

BRIEF DESCRIPTION

Figure 1 is a process flow diagram of the technical solution of the present invention;

In the picture, 1, adjustment tank, 2, reservoir, 3, SBR pool, 4, return pipe.

detailed description

Example 1

A device for strengthening SBR process pool to treat high ammonia nitrogen wastewater in coal chemical industry, including regulating tank 1, SBR pool group and storage tank 2 connected in sequence through pipelines, the SBR pool group includes at least 2 SBR pools 3, SBR tanks 3 are arranged in parallel. The storage tank 2 is connected to the adjustment tank 1 through a return pipe 4. The return pipe 4 is provided with a return pump. The adjustment tank 1 is provided with a coal chemical production domestic wastewater inlet pipe. The regulating tank is provided with an online ammonia nitrogen analysis instrument, and the SBR tank is provided with an online dissolved oxygen instrument. The online dissolved oxygen instrument is connected to an aeration device, and a matching fan is provided on the aeration device.

Example 2

The flow chart of the technical solution of the present invention will be described in detail below with reference to FIG. 1. The method for enhancing the ammonia nitrogen treatment efficiency of the SBR process for treating coal chemical industry high ammonia nitrogen wastewater is implemented as follows:

A method for enhancing the treatment of high ammonia nitrogen wastewater in coal chemical industry by the SBR process tank, (1) controlling the indicators of the water quality in the adjusting tank: ammonia nitrogen concentration, COD concentration, alkalinity and C:N ratio; (2) adjusting the dissolved oxygen level of the SBR tank, High influent load and sludge concentration, the sludge concentration is determined according to the water quality conditions and seasons of coal chemical industry high ammonia nitrogen wastewater; (3) SBR tank uses sequential batch reactors to alternately enter water, and the effluent returns to the regulating tank through the return pipe. The amount of water is determined according to the concentration of high ammonia nitrogen wastewater in coal chemical industry; (4) By adjusting the inlet and outlet valves of the circulating water pump on the SBR tank, the mixing degree of sludge, water and oxygen in the tank is adjusted to adjust the dissolved oxygen efficiency;

Preferably, the ratio of the water output of the SBR tank to the volume of the coal chemical wastewater in the adjusting tank is 1/6-4/3;

Preferably, the high limit of dissolved oxygen in the SBR tank is 2.0 mg/L, and the control of low dissolved oxygen is achieved by the online dissolved oxygen instrument and aeration device in the SBR tank;

Preferably, the sludge age of the sludge in the SBR pool is 5-40 days, and the residence time of the sludge volume in the SBR pool is controlled by the discharge amount of the remaining sludge in the SBR pool, for example, the sludge in the SBR pool is discharged every time The sludge time is 30～60min, to keep the sludge age of the SBR tank from 5 days to 40 days, and to supplement the SBR-A/B/C/D pool with good activated sludge;

Preferably, the ammonia nitrogen concentration of the water in the adjusting tank is 300 mg/L, and the ammonia nitrogen concentration can be controlled by adjusting the ratio of coal chemical industry high ammonia nitrogen wastewater and SBR effluent through an online ammonia nitrogen analysis instrument;

Preferably, the COD concentration of the pool water in the regulating tank is lower than 1200mg/L, and the C:N ratio is 4; by manual analysis, the amount of alcohol-containing wastewater in the regulating tank is adjusted; COD, stable adjustment of ammonia nitrogen, COD, C:N ratio in the tank to keep the water inlet of the SBR tank stable; the SBR tank controls the dissolved oxygen value in the SBR tank in real time through the cooperative action of the aeration device, fan and online dissolved oxygen instrument;

Preferably, the alkalinity in the adjusting tank is lower than 1000mg/L, and the alkalinity of the adjusting tank is controlled at a required value by adjusting the amount of liquid alkali added;

Preferably, the aeration amount in the SBR pool refers to the size of the aeration amount in the pool is changed by the opening of the intake valve in the SBR pool and the frequency conversion frequency of the fan, the continuous aeration is used to control the aeration mode, the aeration amount is 70m ³ / min-80m ³ /min, continuous aeration for 3 hours, continue stirring for 1 hour after aeration, settling for 1 hour, decanting for 1 hour, and then control the aeration time by the online dissolved oxygen value in the tank ≤ 2mg/L;

Preferably, the sludge concentration in the SBR tank is 3500-5500mg/L; the preferred winter sludge concentration is 5000-5500mg/L, and the summer sludge concentration is 3500-4000mg/L;

Preferably, the hydraulic retention time of the SBR pool is 6-8h, the hydraulic retention time is adjusted according to the change of the inlet water load, the inlet water load is stable, the residence time is 6 hours, the inlet water increases and fluctuates, and the online dissolved oxygen value does not reach 2mg/ L, extend the residence time according to the dissolved oxygen value until the effluent is qualified;

Preferably, the ammonia nitrogen concentration of the adjustment tank is adjusted through the backflow water from the storage tank.

Claims (10)

1. A device for strengthening SBR process pool to treat high ammonia nitrogen wastewater in coal chemical industry is characterized in that it includes a regulating tank, an SBR pool group and a storage tank connected in sequence through a pipeline. The SBR pool group includes at least two SBR pools. The SBR tanks are arranged in parallel, the storage tank is connected to the adjustment tank through a return pipe, a return pump is provided on the return pipe, a water inlet pipe for coal chemical production and domestic wastewater is provided on the adjustment tank, and the adjustment tank is provided with An online ammonia nitrogen analysis instrument, an online dissolved oxygen instrument is provided in the SBR tank, the online dissolved oxygen instrument is connected to an aeration device, and a matching fan is provided on the aeration device.
2. The method for enhancing the treatment of high-nitrogen nitrogen wastewater in coal chemical industry by the SBR process tank according to claim 1, characterized in that: (1) the indicators for controlling the water quality in the adjusting tank: ammonia nitrogen concentration, COD concentration, alkalinity and C:N ratio; (2) Adjust the dissolved oxygen level, high influent load and sludge concentration of the SBR tank, the sludge concentration is determined according to the water quality conditions and seasons of the high ammonia nitrogen wastewater of the coal chemical industry; (3) The SBR pool adopts sequential batch reactors to alternately feed water, The effluent flows back into the adjustment tank through the return pipe, and the amount of returned water is determined according to the concentration of high ammonia nitrogen wastewater in coal chemical industry; (4) By adjusting the inlet and outlet valves of the circulating water pump on the SBR tank, the mixing degree of sludge, water and oxygen in the tank is adjusted to adjust the solution Oxygen efficiency.
3. The method for enhancing the treatment of coal chemical industry high ammonia nitrogen wastewater by the SBR process pool according to claim 2, characterized in that the volume ratio of the water output of the SBR tank to the volume of coal chemical industry wastewater in the regulating tank is 1/6-4/3 .
4. The method for enhancing the treatment of high ammonia nitrogen wastewater in coal chemical industry by the SBR process tank according to claim 2, characterized in that the high limit of dissolved oxygen in the SBR tank is 2.0 mg/L, and the low dissolved oxygen is controlled online through the SBR tank Dissolved oxygen instruments and aeration devices have been realized.
5. The method for enhancing the treatment of coal chemical industry high ammonia nitrogen wastewater by the SBR process tank according to claim 2, characterized in that the sludge age of the sludge in the SBR tank is 5-40 days, and is discharged through the remaining sludge in the SBR tank The amount controls the residence time of the amount of sludge in the SBR tank.
6. The method for enhancing the treatment of coal chemical industry high ammonia nitrogen wastewater by the SBR process pool according to claim 2, characterized in that the ammonia nitrogen concentration of the pool water in the adjusting tank is 300mg/L, and the coal chemical industry high ammonia nitrogen wastewater is adjusted by an online ammonia nitrogen analysis instrument And SBR effluent ratio to control the concentration of ammonia nitrogen.
7. The method for enhancing the treatment of coal chemical industry high ammonia nitrogen wastewater by the SBR process tank according to claim 2, characterized in that the COD concentration of the pool water in the adjusting tank is lower than 1200mg/L, and the C:N ratio is 4; by manual analysis , Adjust the volume of alcohol-containing wastewater in the regulating tank; set up a special pipeline for alcohol-containing wastewater in the regulating tank, adjust the COD of the regulating tank, stabilize the ratio of ammonia nitrogen, COD, and C:N in the regulating tank, and keep the inflow of the SBR pool stable; The synergistic effect of the gas device, fan and online dissolved oxygen instrument can control the dissolved oxygen value in the SBR tank in real time.
8. An enhanced SBR process tank for treating coal chemical industry high ammonia nitrogen wastewater as claimed in claim 2, wherein the alkalinity in the adjustment tank is lower than 1000mg/L, and the adjustment tank is controlled by adjusting the amount of liquid alkali added The alkalinity is at the demand value.
9. The method for enhancing the treatment of coal chemical industry high ammonia nitrogen wastewater by the SBR process pool according to claim 2, characterized in that the aeration amount in the SBR pool refers to the change through the inlet valve opening in the SBR pool and the frequency conversion frequency of the fan The size of the aeration in the tank, the continuous aeration is used to control the aeration mode, the aeration is 70m ³ /min-80m ³ /min.
10. The method for enhancing the treatment of coal chemical industry high ammonia nitrogen wastewater by the SBR process tank according to claim 2, characterized in that the sludge concentration in the SBR tank is 3500-5500mg/L; the preferred winter sludge concentration is 5000-5500mg /L, the summer sludge concentration is 3500-4000mg/L;

    Preferably, the hydraulic retention time of the SBR pool is 6-8h, the hydraulic retention time is adjusted according to the change of the inlet water load, the inlet water load is stable, the residence time is 6 hours, the inlet water increases and fluctuates, and the online dissolved oxygen value does not reach 2mg/ L, extend the residence time according to the dissolved oxygen value until the effluent is qualified;

    Preferably, the ammonia nitrogen concentration of the adjustment tank is adjusted through the backflow water from the storage tank.

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