CN214032166U

CN214032166U - Silver powder production wastewater treatment system

Info

Publication number: CN214032166U
Application number: CN202023196896.5U
Authority: CN
Inventors: 郑建伟; 胡卜元; 缪强强; 张蕊蕊
Original assignee: Jiangsu Zhenyi Environmental Protection Technology Co ltd
Current assignee: Jiangsu Zhenyi Environmental Protection Technology Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-08-24
Anticipated expiration: 2030-12-25

Abstract

The utility model relates to the technical field of waste water treatment, in particular to a waste water treatment system for silver powder production, comprising: a pretreatment system, including a silver ion reaction tank and a sedimentation tank, which are used for removing silver ions in waste water and obtaining silver salt-containing precipitates ; Biological treatment system, including intermediate pools, denitrification filters, MBR reactors, anammox reactors and N-type biological aeration filters arranged in sequence along the flow direction of sewage, the intermediate pools are set to receive sedimentation The supernatant of the tank, the denitrification filter contains denitrifying bacteria that can reduce nitrate to nitrogen, and the MBR reactor contains microorganisms that can convert ammonia nitrogen into nitrate and remove organic pollutants in wastewater; According to the characteristics of wastewater, the utility model selects a combined process for biological treatment of wastewater suitable for high organic matter, high ammonia nitrogen and high nitrate silver powder production. Compared with the traditional process, the MVR evaporation system is reduced, and the equipment investment and operating costs are low.

Description

Silver powder production wastewater treatment system

Technical Field

The utility model relates to a waste water treatment technical field particularly relates to silver powder waste water processing system.

Background

The silver powder production process generates process wastewater, ground clean water, waste gas treatment wastewater, domestic sewage, initial rainwater and the like. The organic pollutants (mainly comprising ethanol, vitamin C, dehydrovitamin C and the like) in the wastewater have high concentration (usually 15000-20000 mg/L), high ammonia nitrogen concentration (usually 5000-6000 mg/L) and high ammonium nitrate concentration (usually 4000-5000 mg/L) and contain the pollutants (namely silver ions) specified in the Integrated wastewater discharge Standard (GB 8978-. In addition, the salt content of the waste water after waste gas removal treatment is high (usually up to 20000-30000 mg/L).

The traditional process adopts the processes of pretreatment, MVR evaporation and multi-stage nitrification and denitrification, the treatment of the process is stable, and the effluent can reach the discharge standard. However, this process also has problems: 1) the MVR process has higher equipment investment and operation cost, indirectly increases the production cost and reduces the product competitiveness; 2) the whole system has long flow and complex operation management, and needs higher-level operation management personnel; 3) the MVR is evaporated from ammonium nitrate wastewater containing organic matters, so that potential safety hazards exist; 4) the evaporation residue is ammonium nitrate containing organic matters, and potential safety hazards exist in storage; 5) the evaporation residue is a dangerous waste, and the disposal cost is high.

Prior art documents:

patent document 1CN206767891U silver-containing wastewater treatment system

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a silver powder waste water treatment system, can be the pertinence get rid of in the waste water, high ammonia nitrogen and high nitrate, abandon traditional MVR technology, realize that the security is high, the running cost is low.

In order to realize the above purpose, the utility model provides a silver powder waste water treatment system, include:

the pretreatment system comprises a silver ion reaction tank and a sedimentation tank, and is used for removing silver ions in the wastewater and obtaining a precipitate containing silver salt;

the biological treatment system comprises an intermediate water tank, a denitrification filter tank, an MBR (membrane bioreactor), an anaerobic ammonium oxidation reactor and an N-type biological aerated filter which are sequentially arranged along the sewage flowing direction, wherein the intermediate water tank is arranged to receive supernatant of a sedimentation tank, the denitrification filter tank contains denitrifying bacteria capable of reducing nitrate into nitrogen, and the MBR contains microorganisms capable of converting ammonia nitrogen into nitrate and removing organic pollutants in wastewater; the anaerobic ammonia oxidation reactor and the N-type biological aerated filter are used for reacting ammonia nitrogen in the wastewater with nitrite to generate nitrogen so as to remove the ammonia nitrogen in the wastewater;

the sludge treatment system comprises a sludge concentration tank and a sludge dewatering machine.

Preferably, an internal reflux pipeline is arranged between the denitrification filter tank and the MBR reactor, and the internal reflux ratio is 2-4.

Preferably, an internal reflux pipeline is arranged between the anaerobic ammonia oxidation reactor and the N-type biological aerated filter, and the internal reflux ratio is 2-4.

Preferably, the N-type biological aerated filter contains nitrosobacteria for converting ammonia nitrogen in the wastewater into nitrite.

Preferably, the anaerobic ammonia oxidation reactor contains ammonia oxidizing bacteria for promoting ammonia nitrogen to react with nitrite in the return water of the N-type biological aerated filter to generate nitrogen.

Preferably, the pretreatment system also comprises a regulating tank for regulating the water quality and the water quantity, and a sludge tank for collecting the solids in the sedimentation tank and dehydrating the solids through a sludge dehydrator.

Preferably, the sludge concentration tank collects residual sludge generated by the denitrification filter, the N-type biological aerated filter backwash water and the MBR, supernatant is returned to the intermediate water tank after sludge concentration, the sludge dewatering machine is used for further dewatering the concentrated sludge in the sludge concentration tank, and dewatering filtrate flows back to the intermediate water tank.

Compared with the prior art, the utility model has the advantages that:

1) equipment investment and operating cost: the utility model selects the combined process suitable for biological treatment of the wastewater produced by high organic matter, high ammonia nitrogen and high nitrate silver powder according to the characteristics of the wastewater, and compared with the traditional process, the combined process reduces the MVR evaporation system and has the advantages of low equipment investment and low operating cost;

2) no potential safety hazard: the utility model has no MVR evaporation process, no matter in the evaporation process or in the storage of evaporation residues, no potential safety hazard exists;

3) no hazardous waste is generated: the utility model discloses a silver powder waste water is produced in biological treatment method, and the main process is denitrification, carbonization, anaerobic ammonia oxidation and nitrosation, except that excess sludge, no other secondary pollutant produces, and the biological mud that produces does not belong to hazardous waste.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the inventive subject matter of this disclosure.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a block diagram of the wastewater treatment system for silver powder production.

Detailed Description

For a better understanding of the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways in any silver powder production wastewater treatment system, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.

The utility model aims to realize that the high organic matter, the high ammonia nitrogen and the high nitrate silver powder in the waste water are removed by selecting the suitable biological treatment process according to the characteristics of the waste water.

Referring to fig. 1, the silver powder production wastewater treatment system provided in this embodiment includes a pretreatment system, a biological treatment system and a sludge treatment system, wherein the pretreatment system is used for removing silver ions and suspended matters in wastewater, the biological treatment system is used for removing organic matters, ammonia nitrogen and total nitrogen in wastewater, the final effluent of the biological treatment system reaches the national discharge standard, and then is connected to a sewage treatment plant in a park for further treatment, and residual sludge and backwash water generated by the biological treatment system enter the sludge treatment system for further treatment, so as to further concentrate sludge.

Referring to fig. 1, the pretreatment system comprises an adjusting tank, a desilvering reaction tank, a sedimentation tank, a sludge tank and a sludge filter press, wherein the adjusting tank is used for adjusting water quality and water quantity, sodium chloride (namely NaCl) is added into the desilvering reaction tank to react with silver ions in wastewater to generate silver chloride solids, the sedimentation tank is used for carrying out solid-liquid separation on effluent of the desilvering reaction tank, the generated solids enter the sludge tank, are dehydrated by a sludge dehydrator and then are recycled, and supernatant of the sedimentation tank enters a biological treatment system for further treatment;

referring to fig. 1, the biological treatment system comprises an intermediate water tank, a denitrification filter, an MBR reactor, an anaerobic ammonium oxidation reactor and an N-type biological aerated filter, wherein the intermediate water tank is used for receiving effluent and dehydration filtrate from the pretreatment system, and the denitrification filter is used for reducing part of nitrate in wastewater into nitrogen by using denitrifying bacteria to remove nitrate nitrogen in the wastewater; the MBR reactor is used for removing organic pollutants in wastewater by using microorganisms and converting part of ammonia nitrogen into nitrate, wherein the MBR reactor has the main functions of adsorbing and degrading the organic pollutants in the wastewater by using aerobic microorganisms and converting a small amount of ammonia nitrogen into nitrate, an internal reflux pipeline is arranged between the denitrification filter tank and the MBR reactor, and the internal reflux ratio is 2-4; the anaerobic ammonia oxidation reactor uses ammonia oxidizing bacteria to promote ammonia nitrogen in the wastewater to react with nitrite in the return water of the N-type biological aerated filter to generate nitrogen, so as to remove the total nitrogen in the wastewater; the N-type biological aerated filter converts ammonia nitrogen in wastewater into nitrite by using nitrosobacteria, an internal reflux pipeline is arranged between the N-type biological aerated filter and the anaerobic ammonia oxidation reactor, and the internal reflux ratio is 2-4.

Referring to fig. 1, the sludge treatment system is composed of a sludge concentration tank and a sludge filter press. The sludge concentration tank collects residual sludge generated by the denitrification filter, the N-type biological aerated filter backwash water and the MBR reactor and carries out sludge concentration, and the generated supernatant liquid flows back to the middle water tank; the sludge dewatering machine is used for further dewatering sludge at the bottom of the sludge concentration tank, finally the produced sludge is sent to qualified units for treatment, and dewatering filtrate flows back to the intermediate water tank.

Combine above-mentioned embodiment, the utility model has the advantages of it is following:

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.

Claims

1. silver powder production wastewater treatment system, is characterized in that, comprises:

A pretreatment system, including a silver ion reaction tank and a sedimentation tank, is used to remove silver ions in wastewater and obtain a precipitate containing silver salts;

The biological treatment system includes an intermediate tank, a denitrification filter, an MBR reactor, an anammox reactor and an N-type aerated biological filter arranged in sequence along the flow direction of the sewage, the intermediate tank is set to receive a sedimentation tank The supernatant, the denitrification filter contains denitrifying bacteria that can reduce nitrate to nitrogen, and the MBR reactor contains microorganisms that can convert ammonia nitrogen into nitrate and remove organic pollutants in wastewater; The anaerobic ammonium oxidation reactor and the N-type aerated biological filter are used to react ammonia nitrogen in the wastewater with nitrite to generate nitrogen, so as to remove the ammonia nitrogen in the wastewater;

Sludge treatment system, including sludge thickening tank and sludge dewatering machine.

2 . The silver powder production wastewater treatment system according to claim 1 , wherein an internal reflux pipeline is arranged between the denitrification filter tank and the MBR reactor, and the internal reflux ratio is 2-4. 3 .

3. The silver powder production wastewater treatment system according to claim 1, characterized in that, between the anammox reactor and the N-type aerated biological filter, an internal return pipeline is provided, and the internal return ratio is 2 to 4 .

4 . The silver powder production wastewater treatment system according to claim 3 , wherein the N-type aerated biological filter contains nitrosating bacteria for converting ammonia nitrogen in the wastewater into nitrite. 5 .

5. The silver powder production wastewater treatment system according to claim 4, wherein the anammox reactor contains ammonia oxidizing bacteria for promoting nitrous acid in ammonia nitrogen and N-type aerated biological filter backflow water The salt reacts to form nitrogen gas.

6. The silver powder production wastewater treatment system according to claim 1, characterized in that, the pretreatment system further comprises a regulating pond for regulating water quality and quantity, and a sludge pond for collecting in the sedimentation pond. The solids are dewatered by a sludge dewatering machine.

7. silver powder production wastewater treatment system according to claim 1, is characterized in that, described sludge thickening tank collects the residual pollution produced from denitrification filter tank, N-type biological aerated filter tank backwash water and MBR reactor. After the sludge is concentrated, the supernatant is returned to the intermediate tank. The sludge dewatering machine is used to further dehydrate the concentrated sludge in the sludge concentration tank, and the dewatered filtrate is returned to the intermediate tank.