CN211111560U

CN211111560U - Sewage treatment system of stainless steel pickling production line

Info

Publication number: CN211111560U
Application number: CN201920889895.7U
Authority: CN
Inventors: 殷志华
Original assignee: Zhangjiagang Pohang Stainless Steel Co Ltd
Current assignee: Zhangjiagang Pohang Stainless Steel Co Ltd
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2020-07-28
Anticipated expiration: 2029-06-13

Abstract

The utility model discloses a sewage treatment system of a stainless steel pickling production line, which comprises an adjusting tank, a first-level anoxic tank, a first-level aerobic tank, a second-level anoxic tank, a second-level aerobic tank, a dissolved oxygen tank, a sedimentation tank, a clarification tank, a sand filter and a discharge tank which are sequentially connected by pipelines, wherein the dissolved oxygen tank is provided with a first pipeline connected with the first-level anoxic tank, and the sedimentation tank is provided with a second pipeline connected with the first-level anoxic tank; it is characterized in that an on-line nitrate nitrogen detector is additionally arranged in the regulating reservoir; a third pipeline is arranged between the primary aerobic tank and the primary anoxic tank, an aeration system is arranged in the primary aerobic tank, and a biological carrier is added into the primary aerobic tank; the second-stage anoxic tank is provided with a carbon source feeding pipeline. The utility model has the advantages that: monitoring the nitrate and nitrogen content of the wastewater in the regulating reservoir in real time, and judging whether the treated water quantity needs to be adjusted or not in time; provides a more stable environment for microorganisms, degrades residual carbon sources and nitrogen-containing substances, ensures that effluent reaches the discharge standard, and has the advantages of strong system impact resistance, stable performance and reliable operation.

Description

Sewage treatment system of stainless steel pickling production line

Technical Field

The utility model belongs to the technical field of sewage treatment, especially, relate to a sewage treatment system of stainless steel pickling production line.

Background

Stainless steel manufacturing enterprises design a sewage treatment station, and in the prior art, two independent treatment processes exist in the sewage treatment station for respectively treating annealing wastewater (1,200 m)³D) and cold rolling waste water (1,200 m)³And d), adopting a combined treatment process of neutralization, secondary A/O and sand filtration, wherein the sand filtration treatment process section is shared. As shown in figure 1, the sewage treatment device and the related process are as follows: h is added into a regulating tank₂SO₄And (4) finely adjusting the pH value of the water coming from the workshop, and lifting the effluent to a first-stage anoxic tank through a pump to perform denitrification reaction to remove nitrate nitrogen. Because the COD concentration in the wastewater is low, methanol serving as a carbon source needs to be additionally added, and the thorough denitrification is ensured; the effluent of the primary anoxic tank automatically flows to the primary aerobic tank, a small amount of ammonia nitrogen and organic nitrogen in the raw water are converted into nitrate nitrogen, and a carbon source is consumed; the first-stage aerobic effluent automatically flows to a second-stage anoxic tank, the residual nitrate nitrogen is further reacted to generate nitrogen, the anoxic effluent automatically flows to the second-stage aerobic tank again, the residual carbon source is consumed, and the COD, ammonia nitrogen and total nitrogen of the final effluent are ensured to reach the standard; the aerobic effluent automatically flows to a DO consumption tank (a dissolved oxygen tank in figure 1) and then automatically flows to a sedimentation tank for mud-water separation; part of the water discharged from the DO consumption pool (dissolved oxygen pool) flows back to the first-stage anoxic pool, and the nitrate nitrogen generated by the conversion of the aerobic section flows back to the anoxic pool for denitrification reaction, so as to ensure that the nitrogen content of the final discharged water reaches the standard; part of sludge in the sedimentation tank flows back to the first-stage anoxic tank to ensure that the biochemical section has proper sludge concentration; the effluent of the sedimentation tank automatically flows to a clarification tank, and is lifted to a sand filter by a pump for filtering treatment, so that the final effluent SS is ensured to reach the standard; the sand filtration effluent automatically flows to a discharge tank to reach the discharge standard. The annealing wastewater treatment system has relatively stable water inlet with water inlet of 1,200m³The wastewater treatment system comprises the following components of/d, TN800 mg/L, NH 3-N10-20 mg/L and COD 10 mg/L, and the inlet water of the wastewater treatment system is rich in calcium ions (Ca)²⁺500-800 mg/L. Ca (OH) is selected for workshop production₂The neutralization treatment is carried out, so that the hardness of the inlet water of the sewage station system is high, and the biochemical sludge is seriously inorganic. The disadvantages of the prior art include the following:

1. the impact resistance and the stability of discharged water of a sewage station are poor, particularly NH3-N (generally, water inlet NH 3-N10-20 mg/L, water outlet NH3-N is less than 1 mg/L, and if water inlet exceeds 20 mg/L, ammonia nitrogen in the water outlet has an overproof risk), the quality, quantity and the like of inlet water of a system must be strictly monitored, and the discharged water can be stably discharged after reaching the standard.

2. The aerobic section has low concentration of activated sludge, the sludge is seriously inorganic, and the impact resistance of nitrifying bacteria is poor;

3. the carbon source is only added in the first-stage anoxic tank, the first-stage AO section runs in an overload mode, the COD load of the second-stage inflow water is low, the phenomenon that sludge is decomposed by endogenous respiration of microorganisms exists, COD and ammonia nitrogen are released, the COD and ammonia nitrogen concentration of the discharged effluent are higher and are close to the discharge limit value;

4. the biochemical sludge yield is high, and the sludge disposal cost is high.

SUMMERY OF THE UTILITY MODEL

For overcoming prior art's not enough, the utility model aims to provide a sewage treatment system of stainless steel pickling production line reforms transform on prior art's basis, optimizes process flow, carries out real time monitoring to the system quality of water of intaking, to the sewage standing water out unstability, especially go out water T-N (total nitrogen, the drainage index) easily exceed standard, go out the higher problem of water COD value, improve biochemical system's activity and effective microorganism volume, ensure that it is up to standard to go out water, improve the whole impact resistance of system and stability.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a sewage treatment system of a stainless steel pickling production line comprises a regulating tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, a dissolved oxygen tank, a sedimentation tank, a clarification tank, a sand filter and a discharge tank which are sequentially connected by pipelines, wherein the dissolved oxygen tank is provided with a first pipeline connected with the primary anoxic tank, and the sedimentation tank is provided with a second pipeline connected with the primary anoxic tank; the method is characterized in that the regulating reservoir is provided with an online nitrate nitrogen detector, the nitrate nitrogen content of the wastewater in the regulating reservoir is monitored in real time, whether the treated water quantity needs to be adjusted or not is judged in time according to the actual water quality, and the stable operation of a sewage station is guaranteed; a third pipeline is arranged between the primary aerobic tank and the primary anoxic tank, and the primary aerobic tank flows back to the primary anoxic tank; an aeration system is arranged in the primary aerobic tank, and a biological carrier is added into the primary aerobic tank; and the secondary anoxic tank is provided with a carbon source feeding pipeline, so that the carbon source can be conveniently fed.

Further, the biological film amount of the biological carrier is 8000 mg/L.

Compared with the prior art, the beneficial effects of the utility model are that:

1. biological carriers and an aeration system are added into the primary aerobic tank, the primary aerobic tank is transformed into a biological carrier flowing tank, the amount of high-activity microorganisms is increased, a more stable environment is provided for the microorganisms, and the microbial amount of an aerobic section is improved and the impact resistance to the quality of incoming water is enhanced under the condition that the tank capacity is not increased.

2. A pipeline from a first-stage aerobic tank to a first-stage anoxic tank is added to be used as a mixed liquid backflow pipeline, a first-stage AO section removes most pollutants, organic nitrogen and ammonia nitrogen are converted into nitrate nitrogen, and a second-stage AO section is mainly used as a security measure to degrade residual carbon sources and nitrogen-containing substances and ensure that effluent is discharged up to the standard.

3. A carbon source adding pipeline is additionally arranged in the secondary anoxic tank, and carbon sources are selectively added according to the water outlet condition to control the water outlet index; when the ammonia nitrogen and the nitrate nitrogen in the effluent are higher, a carbon source is properly added into the secondary anoxic tank, so that the activity of nitrobacteria is improved, the nitrobacteria participates in denitrification reaction, the content of the ammonia nitrogen and the nitrate nitrogen in the effluent is reduced, and the effluent is ensured to be discharged after reaching the standard.

4. An online nitrate nitrogen detector is additionally arranged in the regulating tank, so that the controllability and stability of the nitrogen load of the biological system are ensured; the nitrate nitrogen content of the wastewater in the regulating reservoir is monitored in real time, whether the treated water quantity needs to be regulated or not is judged in time according to the actual water quality, and the stable operation of a sewage station is guaranteed;

5. the sewage treatment system has strong impact resistance, stable performance and reliable operation;

6. the process has the advantages of high impact resistance, stable performance, reliable operation, no blockage of the biological tank, full utilization of the volume of the biological tank, no dead angle, high volume load, capacity of sewage treatment increased by 2-3 times, improvement of effluent quality, effective specific surface area of a carrier adopted by the process, biofilm amount reaching 8,000 mg/L, convenient operation of an aeration system, simple maintenance and no blockage by adopting an independent aeration system.

Drawings

The present invention will be further explained with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a prior art structure.

Fig. 2 is a schematic structural diagram of the present invention.

In the figure: 1-a regulating tank 2-a first-stage anoxic tank 3-a first-stage aerobic tank 4-a second-stage anoxic tank 5-a second-stage aerobic tank 6-a dissolved oxygen tank 7-a sedimentation tank 8-a clarification tank 9-a sand filter 10-a discharge tank 11-a first pipeline 12-a second pipeline 13-a third pipeline 14-an aeration system 15-a biological carrier 16-a carbon source feeding pipeline.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

As shown in fig. 2, a sewage treatment system of a stainless steel pickling production line comprises a regulating tank 1, a primary anoxic tank 2, a primary aerobic tank 3, a secondary anoxic tank 4, a secondary aerobic tank 5, a dissolved oxygen tank 6, a sedimentation tank 7, a clarification tank 8, a sand filter 9 and a discharge tank 10 which are sequentially connected by pipelines, wherein the dissolved oxygen tank 6 is provided with a first pipeline 11 connected with the primary anoxic tank 2, and the sedimentation tank 7 is provided with a second pipeline 12 connected with the primary anoxic tank 2; the system is characterized in that an on-line nitrate nitrogen detector is additionally arranged in the regulating reservoir 1, the nitrate nitrogen content of the wastewater in the regulating reservoir is monitored in real time, whether the treated water quantity needs to be adjusted or not is judged in time according to the actual water quality, and the stable operation of a sewage station is guaranteed; a third pipeline 13 is arranged between the primary aerobic tank 3 and the primary anoxic tank 2, an aeration system 14 is arranged in the primary aerobic tank 3, the aeration system 14 is an independent aeration system, and a biological carrier 15 is added into the primary aerobic tank 2; the secondary anoxic tank 4 is provided with a carbon source feeding pipeline 16, so that the carbon source can be conveniently fed.

The amount of the bio-film of the bio-carrier 15 is 8000 mg/L.

The utility model is based on the prior art, an on-line nitrate nitrogen detector is additionally arranged in the regulating reservoir 1, the nitrate nitrogen content of the waste water in the regulating reservoir is monitored in real time, and whether the treated water amount needs to be adjusted or not is judged in time according to the actual water quality, so that the stable operation of a sewage station is guaranteed; an aeration system 14 is arranged in the first-stage aerobic tank 3, a biological carrier 15 is added into the first-stage aerobic tank 2, a third pipeline 13 is arranged between the first-stage aerobic tank 3 and the first-stage anoxic tank 2, the biological carrier and the aeration system are added into the first-stage aerobic tank, a biological carrier flowing tank is formed by transformation, high-activity microbial biomass is increased, a more stable environment is provided for microbes, and under the condition that the tank capacity is not increased, the microbial biomass of an aerobic section is increased, and the impact resistance to the quality of incoming water is enhanced. A pipeline from a first-stage aerobic tank to a first-stage anoxic tank is added to be used as a mixed liquid backflow pipeline, a first-stage AO section removes most pollutants, organic nitrogen and ammonia nitrogen are converted into nitrate nitrogen, and a second-stage AO section is mainly used as a security measure to degrade residual carbon sources and nitrogen-containing substances and ensure that effluent is discharged up to the standard.

Claims

1. A sewage treatment system of a stainless steel pickling production line comprises an adjusting tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, a dissolved oxygen tank, a sedimentation tank, a clarification tank, a sand filter and a discharge tank which are sequentially connected by pipelines, wherein an online nitrate nitrogen detector is additionally arranged in the adjusting tank; a third pipeline is arranged between the primary aerobic tank and the primary anoxic tank, an aeration system is arranged in the primary aerobic tank, and a biological carrier is added into the primary aerobic tank; the secondary anoxic tank is provided with a carbon source feeding pipeline; the method is characterized in that: the dissolved oxygen pond is established first pipeline and is connected with one-level oxygen deficiency pond, the sedimentation tank is established the second pipeline and is connected with one-level oxygen deficiency pond.