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Advanced treatment method for electroplating wastewater

A technology for advanced treatment of electroplating wastewater, applied in metallurgical wastewater treatment, water/sewage treatment, special compound water treatment, etc., can solve the problem of ineffective removal of surfactants and other organic pollutants, high treatment costs, and large footprint and other problems, to achieve the effect of high removal rate of suspended solids, improvement of removal rate and low cost

Inactive Publication Date: 2020-09-01
闫娟
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the traditional treatment method has problems such as complex process, high energy consumption, high cost, large floor area and high treatment cost.
For example, the chemical precipitation treatment process can remove heavy metals in electroplating wastewater, but cannot effectively remove surfactants and other organic pollutants, resulting in effluent COD Cr , NH 3 -N, TP, etc. cannot meet the emission standards. Therefore, the research and development can completely remove heavy metals, organic pollutants and other pollutants that are difficult to biochemically treat in the electroplating wastewater, so that all indicators can meet the electroplating pollutant discharge standard GB21900-2008 The advanced treatment method of electroplating wastewater is of great significance

Method used

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  • Advanced treatment method for electroplating wastewater
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  • Advanced treatment method for electroplating wastewater

Examples

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Embodiment 1

[0032] A method for advanced treatment of electroplating wastewater, comprising the following steps:

[0033] Step 1. Pretreatment: Homogenize the electroplating wastewater in the adjustment tank, then enter the pH reaction tank, adjust the pH to 4.5, and then pass it into the degreasing device, and remove the grease through the PERFECT degreasing film of the degreasing device;

[0034] Step 2, coagulation and sedimentation: the effluent of the oil removal device enters the coagulation and sedimentation tank, and the compound flocculant is added at a rate of 1.5kg / t in the stirring and coagulation area of ​​the coagulation and sedimentation tank for reaction coagulation, and solid-liquid separation is carried out in the sedimentation area. The effluent from the coagulation sedimentation tank enters the subsequent section after passing through the microfiltration HMF membrane filter;

[0035] Step 3, electrochemical-photocatalytic-ozone synergistic treatment: the effluent from ...

Embodiment 2

[0048] Step 1. Pretreatment: Homogenize the electroplating wastewater in the adjustment tank, then enter the pH reaction tank, adjust the pH to 4.5, and then pass it into the degreasing device, and remove the grease through the PERFECT degreasing film of the degreasing device;

[0049] Step 2, coagulation and sedimentation: the effluent of the oil removal device enters the coagulation and sedimentation tank, and the compound flocculant is added at a rate of 2.0kg / t in the stirring and coagulation area of ​​the coagulation and sedimentation tank for reaction coagulation, and solid-liquid separation is carried out in the sedimentation area. The effluent from the coagulation sedimentation tank enters the subsequent section after passing through the microfiltration HMF membrane filter;

[0050] Step 3. Electrochemical-photocatalytic-ozone synergistic treatment: the effluent from the microfiltration HMF membrane filter enters the electrochemical-photocatalytic-ozone synergistic reac...

Embodiment 3

[0063] A method for advanced treatment of electroplating wastewater, comprising the following steps:

[0064] Step 1. Pretreatment: Homogenize the electroplating wastewater in the adjustment tank, then enter the pH reaction tank, adjust the pH to 4.5, and then pass it into the degreasing device, and remove the grease through the PERFECT degreasing film of the degreasing device;

[0065]Step 2, coagulation and sedimentation: the effluent of the oil removal device enters the coagulation and sedimentation tank, and the compound flocculant is added in the stirring and coagulation area of ​​the coagulation and sedimentation tank to react coagulation, and the solid-liquid separation is carried out in the sedimentation area, and the coagulation and sedimentation tank effluent After passing through the microfiltration HMF membrane filter, it enters the subsequent section;

[0066] Step 3. Electrochemical-photocatalytic-ozone synergistic treatment: the effluent from the microfiltration...

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Abstract

The invention discloses an advanced treatment method for electroplating wastewater. The advanced treatment method comprises the following steps: step 1, pretreatment; step 2, coagulating sedimentation; step 3, electrochemical-photocatalysis-ozone synergistic treatment; step 4, treatment by a cation exchange resin column; step 5, treatment in a biological aerated filter; and step 6, nanofiltrationand reverse osmosis treatment. The process steps are matched with one another, the layout is compact, the floor area is small, and the energy consumption is low. Oil is removed through pretreatment, suspended matters, cyanides and colloids are removed through coagulating sedimentation, nitrogen and phosphorus can be removed through electrochemical-photocatalysis-ozone synergy, organic contaminantsare thoroughly removed, most heavy metal ions are removed through treatment by the cation exchange resin column, the biological aerated filter is capable of remarkably improving water quality, reducing the workload of a subsequent membrane system and removing residual trace organic pollutants and heavy metal ions, and finally desalination is carried out by virtue of nanofiltration and a two-stagereverse osmosis system, so that the effluent quality meets the electroplating wastewater discharge standard GB21900-2008.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for advanced treatment of electroplating wastewater. Background technique [0002] The wastewater discharged from electroplating production is characterized by various types and complex water quality, containing a large amount of toxic and harmful substances, such as chromium, cadmium, lead, nickel and other heavy metals, as well as various types of surfactants, malic acid, citric acid, aromatic aldehydes, EDTA, sulfur Brighteners and additives such as urea, acetylene glycol, and coumarin. [0003] At present, the common electroplating wastewater treatment methods include chemical method, reverse dialysis method, ion exchange method, biological method and so on. The traditional treatment of electroplating wastewater only focuses on the removal of heavy metals, while ignoring other indicators such as: COD Cr , NH 3 -N, TP, etc. In addition, traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/16C02F101/20C02F101/30C02F101/18
CPCC02F9/00C02F2103/16C02F1/66C02F1/40C02F1/52C02F1/444C02F1/461C02F1/30C02F1/78C02F2001/425C02F1/42C02F3/02C02F1/442C02F1/441C02F3/34C02F2305/10C02F2101/20C02F2101/30C02F2101/18Y02A20/131
Inventor 闫娟
Owner 闫娟
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