Treatment process and treatment system of lithium battery waste liquid

A treatment process, lithium battery technology, applied in precipitation treatment, multi-stage water treatment, water/sewage treatment, etc., can solve problems such as easy blockage of filter membranes, collapse of biochemical systems, excessive pollutants, etc., to improve biodegradability, Reduce the content of pollutants and reduce the effect of COD

Active Publication Date: 2017-05-17
GUANGREEN ENVIRONMENTAL PROTECTION ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention patent with the patent application number 201610057373.1 discloses a method using Fenton's reagent, A 2 / O and MBR lithium battery waste liquid treatment process, but the inventive method has the following defects: 1, the cost of using Fenton's reagent is very high, and the operation of Fenton's reagent needs to rely on highly reliable sensors and automatic control systems, If there is a slight deviation in practice, strong oxidants or strong acids and strong alkalis will cause the collapse of the subsequent biochemical system, causing the discharged pollutants to exceed the standard; 2. Adding biological activated carbon to the MBR membrane bioreactor is easy to block the filter membrane; 3. Although this method can It meets the first-level standard of GB8978-1996, but cannot meet the new national standard requirements of GB30484-2013

Method used

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  • Treatment process and treatment system of lithium battery waste liquid
  • Treatment process and treatment system of lithium battery waste liquid
  • Treatment process and treatment system of lithium battery waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A treatment system used in the treatment process of lithium battery waste liquid, which sequentially includes an aeration regulating tank 1, a coagulation sedimentation tank 2, an electrochemical treatment unit 3, a comprehensive regulating tank 4, and an ABR tank 5 according to the flow direction of the lithium battery waste liquid , anoxic tank 6, MBR membrane bioreactor 7, denitrification tank 8, nitrification biological aerated filter tank 9, breakpoint chlorination tank 10;

[0036] The MBR membrane bioreactor 7 is provided with a sludge outlet, and a sludge return channel 12 is provided between the sludge outlet and the ABR pool 5, and the sludge outlet is also connected with a biochemical sludge pool 11, and the MBR Between the water outlet of the membrane bioreactor 7 and the water inlet of the anoxic tank 6, a first backflow channel 13 for lithium battery waste liquid is provided;

[0037] A second backflow channel 14 for lithium battery waste liquid is provide...

Embodiment 2

[0039] A treatment process for lithium battery waste liquid, comprising the steps of:

[0040] (1) Electrochemical treatment: the lithium battery waste liquid is introduced into the electrochemical treatment unit for electrocoagulation reaction; the electrochemical treatment unit triggers the electrocoagulation reaction through the bipolar plates powered by DC pulses, and the voltage between the two polar plates is 60V, The pole distance is 5cm, the pulse frequency is 7kHz, and the electrocoagulation reaction time is 2h;

[0041] (2)A 2 / O treatment: the lithium battery waste liquid after electrochemical treatment is introduced into anaerobic tank, anoxic tank and aerobic filter device sequentially, and the aerobic filter device is an MBR membrane bioreactor; the MBR membrane bioreactor and A sludge return channel is provided between the anaerobic tanks, the sludge return ratio from the MBR membrane bioreactor to the anaerobic tank is 50%, and between the outlet of the MBR me...

Embodiment 3

[0044] A treatment process for lithium battery waste liquid, comprising the steps of:

[0045] Step A pretreatment: the lithium battery waste liquid is introduced into the aeration regulating tank 1 and the coagulation sedimentation tank 2 in sequence, aeration and stirring are carried out in the aeration regulating tank, the aeration gas water ratio is 4:1, and the residence time is 15h .

[0046] (1) Electrochemical treatment: the lithium battery waste liquid is introduced into the electrochemical treatment unit 3 for electrocoagulation reaction; the electrochemical treatment unit 3 triggers the electrocoagulation reaction through the bipolar plates powered by DC pulses, and the voltage between the two polar plates is 60V, pole distance 6cm, pulse frequency 8kHz, electrocoagulation reaction time 2.5h;

[0047] Adding nutrients in step B: introduce the electrochemically treated lithium battery waste liquid into the comprehensive adjustment pool 4, and put solid organic nutri...

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Abstract

The invention relates to the technical field of sewage treatment, and in particular to a treatment process and a treatment system of lithium battery waste liquid. The treatment process comprises the following steps: (1) electrochemical treatment: introducing the lithium battery waste liquid into an electrochemical treatment unit for electric flocculation reaction; (2) A2 / O treatment: introducing the electrochemically treated lithium battery waste liquid into an anaerobic tank, an anoxic tank and an aerobic filter device in sequence, wherein the aerobic filter device is an MBR (Membrane Biological Reactor) or consists of an aerobic tank and a secondary settling tank which are communicated with each other; (3) denitrification and nitration: introducing the lithium battery waste liquid subjected to the A2 / O treatment into a denitrification tank for denitrification reaction and a nitration aeration biological filter tank for nitration reaction, and then discharging the lithium battery waste liquid. By the adoption of electrolytic flocculation treatment, A2 / O and nitration and denitrification combination process for treatment, the contents of various pollutants in the lithium battery waste liquid are substantially reduced, so that the final discharge standard meets the requirements of GB30484-2013.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment process for lithium battery waste liquid and a treatment system thereof. Background technique [0002] Lithium batteries are one of the most popular batteries in the 21st century, widely used in video cameras, mobile phones, notebook computers, portable measuring instruments, electric vehicles, etc. In the production process of lithium batteries, a large amount of cleaning wastewater will be generated. The cleaning wastewater contains a large amount of organic pollutants and cannot be discharged directly. It needs to be treated before it can be discharged. Therefore, the treatment process of lithium battery waste liquid has also emerged as the times require. As for the treatment process of lithium battery waste liquid, the prior art still uses Fenton's reagent as an important link. [0003] The invention patent with the patent application number 201610057373...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30C02F103/34
CPCC02F1/463C02F3/02C02F3/1268C02F3/30C02F3/302C02F9/00C02F2001/007C02F2101/30C02F2103/34C02F2209/08C02F2301/08
Inventor 戴双建李传家李利红张玉岩
Owner GUANGREEN ENVIRONMENTAL PROTECTION ENG
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