A preparation for advanced treatment of electroplating wastewater

A technology for electroplating wastewater and advanced treatment, applied in multi-stage water treatment, metallurgical wastewater treatment, water/sewage treatment, etc. Ensure stable operation and fast precipitation

Active Publication Date: 2019-05-03
FUYANG HUAIBANG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Physicochemical + biochemical methods are used for treatment. Since hypophosphite is used as a reducing agent in electroplating wastewater, it is difficult to effectively precipitate, resulting in the concentration of total phosphorus in the biochemical tail water is usually 2-5mg / L, and after precipitation with calcium salt, it usually contains High concentration of fluoride ions, the concentration range is 10-20mg / L, it is difficult to meet the increasingly stringent emission standards
[0015] The Ministry of Environmental Protection requires the electroplating industry to discharge in accordance with GB21900-2008 "Electroplating Pollutant Discharge Standard". Conventional treatment methods are used to treat electroplating wastewater with complex components. Level treatment, etc., so that the dosage of drugs is large, the process repeats to produce a lot of sludge, the cost is high, and it is difficult to ensure that the wastewater discharges up to the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation for advanced treatment of electroplating wastewater, the preparation includes a flocculant and a composite biological agent;

[0043] The flocculant is prepared by compounding diatomaceous earth, hydrogen peroxide, polyaluminum chloride and inorganic cerium salt in a weight ratio of 5:3:2:2.

[0044]The inorganic cerium salt can be selected from one or more of cerium nitrate, cerium sulfate or cerium hydroxide.

[0045] The method for advanced treatment of electroplating wastewater using the above preparation comprises the following steps:

[0046] (1) Solid-liquid separation of electroplating wastewater can effectively prevent clogging and damage to equipment during wastewater transportation;

[0047] (2) Pass the liquid obtained in step (1) through the micro-electrolysis reactor, which is equipped with an anode and a cathode, and the iron anode is continuously dissolved to generate ferrous ions, and the hexavalent chromium is reduced to trivalent chromi...

Embodiment 2

[0062] A preparation for advanced treatment of electroplating wastewater, the preparation includes a flocculant and a composite biological agent

[0063] The flocculant is prepared by compounding diatomaceous earth, hydrogen peroxide, polyaluminum chloride and inorganic cerium salt in a weight ratio of 5:3:2:2.

[0064] The inorganic cerium salt can be selected from one or more of cerium nitrate, cerium sulfate or cerium hydroxide.

[0065] The method for advanced treatment of electroplating wastewater using the above preparation comprises the following steps:

[0066] (1) Solid-liquid separation of electroplating wastewater can effectively prevent clogging and damage to equipment during wastewater transportation;

[0067] (2) Pass the liquid obtained in step (1) through the micro-electrolysis reactor, which is equipped with an anode and a cathode. Under the action of direct current, the iron anode is continuously dissolved to produce ferrous ions, and the hexavalent chromium...

Embodiment 3

[0082] A batch of electroplating wastewater from a certain factory was treated by the method of Example 1, and the results are shown in Table 1.

[0083] Table 1

[0084]

[0085] Through the method of the present invention, the electroplating wastewater is further treated. In the wastewater after treatment, the total phosphorus concentration is less than 0.5mg / L, the fluoride is less than 10mg / L, and the total cyanide content is less than 0.2mg / L. Emission Standard", has a good treatment effect.

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PUM

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Abstract

The invention relates to a preparation for deep treatment on electroplating wastewater. The preparation comprises flocculant and a composite bacterial agent, wherein the flocculant is prepared from kieselguhr, hydrogen peroxide, polymeric aluminum and inorganic cerate in a weight ratio of 5:3:2:2 in a compounding manner; the inorganic cerate can be one or more of cerous nitrate, cerous sulfate or cerium hydroxide. By adopting the preparation, the treatment amount of the electroplating wastewater can be increased, the treatment water quality can be improved, the operation expense can be lowered, and the discharge water quality can meet the standard.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a preparation for advanced treatment of electroplating wastewater. Background technique [0002] The electroplating industry is usually divided into cyanide-containing wastewater, chromium-containing wastewater, heavy metal wastewater, and acid-base wastewater according to the types of pollutants. Among them, cyanide- and chromium-containing wastewater contains highly toxic cyanide and hexavalent chromium, and it is discharged to Water can be hazardous to aquatic life. Under normal circumstances, cyanide-containing and chromium-containing wastewater need to be collected and treated separately. Because the pH of hexavalent chromium in chromium-containing wastewater is acidic, generally between 2 and 3, it needs to be reduced with a reducing agent and then chemically precipitated, while the pH of cyanide-containing wastewater requires Under alkaline condit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F9/14C02F103/16
CPCC02F1/46104C02F1/5236C02F1/66C02F3/34C02F9/00C02F2103/16C02F2301/08
Inventor 李为
Owner FUYANG HUAIBANG MACHINERY
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