CN112919667A - Industrial heavy metal sewage treatment system - Google Patents

Industrial heavy metal sewage treatment system Download PDF

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Publication number
CN112919667A
CN112919667A CN201911237363.6A CN201911237363A CN112919667A CN 112919667 A CN112919667 A CN 112919667A CN 201911237363 A CN201911237363 A CN 201911237363A CN 112919667 A CN112919667 A CN 112919667A
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China
Prior art keywords
heavy metal
unit
adsorption
sludge
tank
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CN201911237363.6A
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Chinese (zh)
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陈沿
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Individual
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Individual
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Priority to CN201911237363.6A priority Critical patent/CN112919667A/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The invention provides an industrial heavy metal sewage treatment system which comprises a pretreatment unit, a reaction sedimentation tank, an adsorption unit, a post-treatment unit and a sludge treatment unit connected with the reaction sedimentation tank, wherein the pretreatment unit, the reaction sedimentation tank, the adsorption unit and the post-treatment unit are sequentially connected; the adsorption unit comprises a heavy metal adsorption device and an adsorption material regeneration device, the first reflux pipe is connected between the adsorption material regeneration device and the regulating tank, and the heavy metal adsorption device is connected with the post-treatment unit. The method has the beneficial effects that the neutralization precipitation method and the activated carbon adsorption method are combined for treatment, so that heavy metal ions in the wastewater can be completely removed; the regeneration times of the activated carbon are reduced, and the cost is saved; the adsorbed heavy metal can be enriched, and the recycling of the heavy metal is facilitated.

Description

Industrial heavy metal sewage treatment system
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to an industrial heavy metal sewage treatment system.
Background
In some industrial fields, such as the industries of electronics, chemical engineering, metallurgy and the like, a large amount of heavy metal wastewater can be generated, heavy metals are not easy to degrade in organisms and only can be migrated, when the heavy metals in the organisms are enriched to a certain degree, the organisms can be greatly damaged, and even serious people can die.
At present, the biodegradability of industrial wastewater containing heavy metals is mostly poor, so physicochemical methods such as chemical precipitation or adsorption are mainly adopted for treatment; at present, different precipitation methods have different treatment defects, for example, the calcium ions in the wastewater are too much due to the precipitation of the added limestone; the sulfuration precipitation method can generate pollutants such as hydrogen sulfide and the like in the treatment process; the hydroxide precipitation method is difficult to remove heavy metal ions because the precipitation moisture content is too large and is difficult to treat, and the pH value of hydroxide generated by different heavy metal ions is different; the adsorption method usually adopts activated carbon or ion resin for adsorption, but the adsorption saturation needs regeneration, the treatment cost is high, and the adsorbed heavy metal ions are difficult to collect and recycle.
Disclosure of Invention
In order to solve the technical problem, the invention provides an industrial heavy metal sewage treatment system.
The specific technical scheme is as follows:
the industrial heavy metal sewage treatment system is characterized by comprising a pretreatment unit, a reaction sedimentation tank, an adsorption unit, a post-treatment unit and a sludge treatment unit connected with the reaction sedimentation tank which are sequentially connected, wherein a first return pipe is connected between the adsorption unit and the pretreatment unit, and a second return pipe is connected between the sludge treatment unit and the pretreatment unit;
the pretreatment unit is used for primarily adjusting water quality, the reaction sedimentation tank is used for adjusting the pH value of wastewater to be alkaline and reacting with heavy metal ions to generate precipitates, the sludge treatment unit is used for treating the precipitates and sludge generated in the reaction sedimentation tank and refluxing the wastewater generated by treating the precipitates and sludge to the pretreatment unit, and the post-treatment unit is used for adjusting the wastewater to be neutral;
the adsorption unit comprises a heavy metal adsorption device and an adsorption material regeneration device, the first backflow pipe is connected between the adsorption material regeneration device and the pretreatment unit, and the heavy metal adsorption device is connected with the post-treatment unit.
In the above technical scheme, the pretreatment unit comprises a grid and an adjusting tank which are connected in sequence.
In the above technical solution, the sludge treatment unit includes a sludge concentration tank and a sludge dewatering device, and the second return pipe is connected between the adjusting tank and the sludge concentration tank.
In the technical scheme, the post-treatment unit comprises a neutralization pond and a stabilization pond, and aquatic plants for adsorbing heavy metal ions are planted in the stabilization pond.
In the technical scheme, a plurality of dosing nozzles are distributed in the reaction sedimentation tank, and a submersible stirrer is arranged in the tank.
In the technical scheme, a sludge conveying pipeline is connected between the adjusting tank and the sludge treatment unit.
In the above technical scheme, the heavy metal adsorption device contains an activated carbon adsorption material.
In the above technical solution, the first return pipe is connected between the adsorbing material regenerating device and the regulating tank.
Compared with the prior art, the method has the beneficial effects that (1) the precipitation method and the activated carbon adsorption method are combined for treatment, so that heavy metal ions in the wastewater can be completely removed; (2) the mode of wastewater backflow of a sludge treatment unit and desorption liquid treatment backflow is adopted, so that new 'three wastes' cannot be generated in the wastewater treatment project; (3) the regeneration times of the activated carbon are reduced, and the cost is saved; (4) the adsorbed heavy metal can be enriched, and the recycling of the heavy metal is facilitated.
Drawings
FIG. 1 is a system diagram according to an embodiment;
FIG. 2 is a diagram of an adsorption unit of the embodiment;
the system comprises a pretreatment unit 1, a reaction sedimentation tank 2, an adsorption unit 3, a post-treatment unit 4, a sludge treatment unit 5, a first return pipe 6, a second return pipe 7, a sludge conveying channel 8, a grid 101, a regulation tank 102, a heavy metal adsorption device 301, an adsorption material regeneration device 302, a neutralization tank 401, a stabilization pond 402, a sludge concentration pond 501 and a sludge dewatering device 502.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
Example one
An industrial heavy metal sewage treatment system comprises a pretreatment unit 1, a reaction sedimentation tank 2, an adsorption unit 3, a post-treatment unit 4 and a sludge treatment unit 5 connected with the reaction sedimentation tank 2, which are connected in sequence;
the pretreatment unit 1 comprises a grating 101 and a regulating tank 102 which are connected in sequence;
the sludge treatment unit 5 comprises a sludge concentration tank 501 and a sludge dewatering device 502, the adjusting tank 102 and the sludge concentration tank 501 are connected with a sludge conveying pipeline 8, solid residues generated in industrial production are removed by the grid tank 101, the adjusting tank 102 adjusts the quality of balanced water quality and is connected with the sludge concentration tank 501, fine residues isolated by the adjusting tank 102 are discharged to the sludge concentration tank 501, a second return pipe 7 is connected between the sludge concentration tank 501 and the adjusting tank 102, and wastewater treated by the sludge concentration tank flows back to the adjusting tank 102 through the second return pipe 7.
A plurality of dosing nozzles are distributed in the reaction sedimentation tank 2, a submersible stirrer is arranged in the tank, the dosing nozzles are used for adding alkaline substances such as sodium hydroxide and the like to generate sediments, the medicines of the stirrer and the wastewater are fully reflected, after a preset pH value is reached, the stirrer is stood to fully precipitate hydroxide sediments, the sediments enter a sludge concentration tank 501, and liquid enters an adsorption unit 3;
adsorption unit 3 includes heavy metal adsorption device 301 and adsorption material regenerating unit 302, first return pipe 6 is connected between adsorption material regenerating unit 302 and equalizing basin 102, heavy metal adsorption device 301 is connected with aftertreatment unit 4, heavy metal adsorption device 301 contains the active carbon adsorption material, get into adsorption material regenerating unit 302 after the active carbon adsorption is saturated, adopt regeneration solution washing such as dilute nitric acid, the active carbon gets into heavy metal adsorption device 301 reuse after the desorption processing, and the waste liquid that produces during the desorption flows back to equalizing basin 102 and handles.
The post-treatment unit 4 comprises a neutralization pond 401 and a stabilization pond 402, wherein the neutralization pond 401 is used for adjusting the wastewater to be neutral and then discharging the wastewater to the stabilization pond 402, and aquatic plants for adsorbing heavy metal ions are planted in the stabilization pond 402 to adsorb the residual heavy metal.
The invention combines the precipitation method and the activated carbon adsorption method, the two methods complement each other, the activated carbon is used for adsorbing heavy metal ions which cannot be completely removed in the precipitation, the activated carbon adsorbs a small amount of heavy metal ions and precipitation residues, the problem of high cost caused by easy saturation of adsorption due to single adsorption and continuous regeneration of the activated carbon is solved, the washing waste liquid generated by desorption is refluxed and collected to the regulating tank, the adsorbed heavy metals can be enriched and reused, and the generation of new three wastes is also avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. The industrial heavy metal sewage treatment system is characterized by comprising a pretreatment unit, a reaction sedimentation tank, an adsorption unit, a post-treatment unit and a sludge treatment unit connected with the reaction sedimentation tank which are sequentially connected, wherein a first return pipe is connected between the adsorption unit and the pretreatment unit, and a second return pipe is connected between the sludge treatment unit and the pretreatment unit;
the pretreatment unit is used for primarily adjusting water quality, the reaction sedimentation tank is used for adjusting the pH value of wastewater to be alkaline and reacting with heavy metal ions to generate precipitates, the sludge treatment unit is used for treating the precipitates and sludge generated in the reaction sedimentation tank and refluxing the wastewater generated by treating the precipitates and sludge to the pretreatment unit, and the post-treatment unit is used for adjusting the wastewater to be neutral;
the adsorption unit comprises a heavy metal adsorption device and an adsorption material regeneration device, the first backflow pipe is connected between the adsorption material regeneration device and the pretreatment unit, and the heavy metal adsorption device is connected with the post-treatment unit.
2. The industrial heavy metal sewage treatment system of claim 1, wherein the pretreatment unit comprises a grid and a regulating tank which are connected in sequence.
3. The industrial heavy metal sewage treatment system of claim 2, wherein the sludge treatment unit comprises a sludge concentration tank and a sludge dewatering device, and the second return pipe is connected between the regulating tank and the sludge concentration tank.
4. The industrial heavy metal sewage treatment system of claim 1, wherein the post-treatment unit comprises a neutralization pond and a stabilization pond, and aquatic plants for adsorbing heavy metal ions are planted in the stabilization pond.
5. The industrial heavy metal sewage treatment system of claim 1, wherein a plurality of dosing nozzles are distributed in the reaction sedimentation tank, and a submersible mixer is arranged in the tank.
6. The industrial heavy metal sewage treatment system of claim 2, wherein a sludge transport pipeline is connected between the regulating pond and the sludge treatment unit.
7. The industrial heavy metal sewage treatment system of claim 1, wherein the heavy metal adsorption device comprises an activated carbon adsorption material.
8. The industrial heavy metal sewage treatment system of claim 2 wherein the first return line is connected between the adsorbent material regeneration device and the conditioning tank.
CN201911237363.6A 2019-12-06 2019-12-06 Industrial heavy metal sewage treatment system Withdrawn CN112919667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911237363.6A CN112919667A (en) 2019-12-06 2019-12-06 Industrial heavy metal sewage treatment system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911237363.6A CN112919667A (en) 2019-12-06 2019-12-06 Industrial heavy metal sewage treatment system

Publications (1)

Publication Number Publication Date
CN112919667A true CN112919667A (en) 2021-06-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911237363.6A Withdrawn CN112919667A (en) 2019-12-06 2019-12-06 Industrial heavy metal sewage treatment system

Country Status (1)

Country Link
CN (1) CN112919667A (en)

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Application publication date: 20210608