CN101565248A - Electroplating wastewater processing method - Google Patents

Abstract

The invention relates to an electroplating wastewater processing method which is realized by the following steps: plating members are cleaned by the reverse flow continuous cleaning manner: deionized water is added in a final-level cleaning tank, and the deionzed water flows into the first-level cleaning tank along the reverse direction for cleaning the plating member through a communication pipeline; wastewater in the first-level cleaning tank is introduced to a circulating water processing system consisting of the following components through a water pump: a multi-medium filter or a bag-type filter, a granular activated carbon filter or a filter element type activated carbon filter, a filter element type precision filter, a hyperfiltration component, and a reverse osmosis component; and the purified seepage water can be directly transmitted to the final-level cleaning tank for recycling. The invention recycles the electroplating wastewater completely, realizes zero-draining pollution, and can be widely used for circular processing and recycling of electroplating rinse water of zinc plating, copper plating, nickel plating and chromium plating.

Description

Electroplating wastewater processing method

Technical field

The present invention relates to a kind of method of wastewater treatment, relate in particular to a kind of electroplating wastewater processing method.

Background technology

Electroplating industry is the important processing industry of China, and at a rough estimate, factory is electroplated by existing 15000 families in the whole nation, and the industry work force surpasses 500,000 people, and existing more than 5000 production line and 2.5-3 hundred million m2 electroplate area throughput.The electroplating industry annual value of production is about 10,000,000,000 yuans.

But the pollution situation of electroplating industry is troubling.According to estimates, a large amount of pollutent of the annual discharging of the industry comprises 400,000,000 tons of heavy metal-containing waste waters, 50000 tons of solid waste and 3000 ten thousand stere sour gas.At present the state-owned Electroplate Factory of 70-80% has set up pollution control facility, and (have only 50% facility to turn round in the city, the Rural areas is lower, has only 25%) can not run well yet most of treatment facility is expired.Most of small towns electroplating enterprise is not then almost taked any pollution control measures.

The improvement of electroplating wastewater can be divided into following four classes substantially in the prior art:

1. physical method.Physical method is to utilize physical action to separate the pollution substance that is suspended state in the waste water. in treating processes, do not change the chemical property of material. and as the oil removing evaporation concentration reuse water in the electroplating wastewater etc.Evaporation concentration reclaims. be that a kind of heavy metal-containing electroplating effluent is evaporated makes it to obtain to concentrate. and is reclaimed and the treatment process of reuse. generally be used for handling and contain chromium-copper silver and nickel ion waste water. and usually with the additive method coupling. the employing atmospheric evaporation cooperates technology with countercurrent rinsing. waste electroplating liquor containing chromium is handled.Evaporation concentration method is handled electroplated heavy metals waste water. good benefits in environment and economic benefit are arranged. be subjected to certain restriction but, process cost big because of energy consumption is high. and usually only as the auxiliary treatment means of other technologies.

2. chemical process.Chemical process adds chemical agent exactly in waste water. and change the chemical property of pollutent in the waste water by chemical reaction, make it be transformed into harmless or be easy to the treatment process from waste water, removed with the material of water sepn.

3. physical chemistry method.Physico-chemical process is the method that waste water is purified by physics and chemical comprehensive action.Mainly contain following five kinds. promptly: the air supporting method---a kind of efficiently, solid-liquid separation technique fast. dissolved air flotation wherein. be to make air soluble in water and state that reaches capacity under certain pressure carry out pneumatically supported method of wastewater treatment again; Ion exchange method---utilize ion exchange resin to exchange and be removed with some ion in the electroplating wastewater. waste water is purified: extraction process---and utilize a kind of water insoluble and can dissolve the organic solvent of certain material in the water. solute in the waste water is fully dissolved and from waste water, separate; Active carbon adsorption---remove micropollutant in the waste water with the adding process of active carbon. to reach the purpose of deep purifying: electrolytic process---make in the waste water objectionable impurities by electrolysis on Yang Yin the two poles of the earth respectively oxidation takes place, reduction reaction changes into innoxious substance, or utilizes the objectionable impurities generation chemical reaction in anodizing reduzate and the waste water. generate water-fast throw out. separate then and remove.Also have in addition by the electrolytic process principle and remove metal ion in the waste water with electroflotation.

4. bioremediation.Biological treatment process mainly is a vital movement process of utilizing microorganism. pollutants in waste water is shifted, transforms the treatment process that makes it to be purified.

How designing a kind of electroplating wastewater processing method more economical and that zero release is polluted is the problem that the technician will solve.

Summary of the invention

The technical issues that need to address of the present invention have provided a kind of electroplating wastewater processing method, are intended to solve the above problems.

In order to solve the problems of the technologies described above, the present invention realizes by following steps:

Adverse current continuous wash mode is adopted in the cleaning of plating piece: in the end the one-level rinse bath adds deionized water, and deionized water cleans the opposite direction that moves by connecting pipe along plating piece and flows to first step rinse bath;

The waste water of first step rinse bath is got to the circular water treating system of being made up of following assembly successively by water pump:

More medium filter or deep bed filter;

Gac filtration device or filer element type activated charcoal filter;

The filer element type accurate filter;

Ultrafiltration module;

Reverse osmosis module;

Infiltration water after the purification can be delivered directly to the reuse of last step rinse bath.

Compared with prior art, the invention has the beneficial effects as follows: accomplish the electroplating wastewater complete-reclaiming, realize the zero release pollution; Can be widely used in the circular treatment and the recovery of electroplating rinse waters such as zinc-plated, copper facing, nickel plating and chromium plating.

Embodiment

Below in conjunction with embodiment the present invention is described in further detail:

The present invention realizes by following steps:

Adverse current continuous wash mode is adopted in the cleaning of plating piece: in the end the one-level rinse bath adds deionized water, and deionized water cleans the opposite direction that moves by connecting pipe along plating piece and flows to first step rinse bath;

The waste water of first step rinse bath is got to the circular water treating system of being made up of following assembly successively by water pump:

More medium filter or deep bed filter; Remove particle, suspended substance and colloidalmaterial in the water, stifled to reduce to the unitary dirt of subsequent disposal.

Gac filtration device or filer element type activated charcoal filter; Partial organic substances in the planar water reduces the TOC content in the water, to reduce the biological pollution to the subsequent film processing unit.

The filer element type accurate filter; Further remove particle, suspended substance and colloidalmaterial in the water, to reduce to the unitary obstruction of subsequent disposal.

Ultrafiltration module; Remove organism, silicon-dioxide and other materials in the water, reduce the water inlet mud index (SDI value) of follow-up reverse osmosis membrane.Thereby reduce the dirt of reverse osmosis membrane is blocked up, prolong the working time of reverse osmosis.

Reverse osmosis module; Thereby most of ion of removing in the water is purified water.The desalination rate of reverse osmosis can reach more than 98%.

Infiltration water after the purification can be delivered directly to the reuse of last step rinse bath.The water rate of recovery of system can reach more than 90%, and the concentrated solution that contains heavy metal after concentrating can mix the back reuse according to a certain ratio with fresh electroplate liquid.

Can the said modules of mentioning in this case have been bought on the market?

Claims (1)

1. electroplating wastewater processing method, realize by following steps:

Adverse current continuous wash mode is adopted in the cleaning of plating piece: in the end the one-level rinse bath adds deionized water, and deionized water cleans the opposite direction that moves by connecting pipe along plating piece and flows to first step rinse bath;

The waste water of first step rinse bath is got to the circular water treating system of being made up of following assembly successively by water pump:

More medium filter or deep bed filter;

Gac filtration device or filer element type activated charcoal filter;

The filer element type accurate filter;

Ultrafiltration module;

Reverse osmosis module;

Infiltration water after the purification can be delivered directly to the reuse of last step rinse bath.