CN1342616A

CN1342616A - Process for reclaiming waste electroplating liquid

Info

Publication number: CN1342616A
Application number: CN 01119844
Authority: CN
Inventors: 孙惠茹; 黄瑞光
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-29
Filing date: 2001-06-29
Publication date: 2002-04-03

Abstract

A process for reclaiming waste electroplating water features that the said waste water is treated chemically, electrochemically, biochemically, biologically microbiologically and physically to purify it to reach the quality of industrial water. The treated water can be reused in the electroplating production. Its advantages are saving water and protecting environment.

Description

Electroplating waste water resource

1.0 electroplating waste water resource is meant that the waste water of Electroplate Factory's point discharge reaches the quality level of process water after thoroughly administering, and is back to Electroplating Production, thereby eliminates the electroplating wastewater contaminate environment, can save a large amount of waters again.The present invention is applicable to national electroplating industry.

2.0 the industrial and agricultural development of China is very rapid since the reform and opening-up, this attracts worldwide attention.Along with Electroplate Factory's point of development of industry and agriculture China also develops into about 10,000 families, about 400,000 people of worker, annual about 4,000,000,000 M of electroplating wastewater that discharge ³Though electroplating wastewater all passes through improvement, qualified discharge.But still contain deleterious compounds such as a spot of heavy metal in wherein, can't be back to Electroplating Production.Put together and see, be still a kind of huge source of pollution, influence the industrial and agricultural production sustainable development.If electroplating wastewater is circulated among the Electroplating Production along with production process is thoroughly administered.And can guarantee the quality of electroplating technology and product, and electroplating waste water resource, not only can decontamination protection environment, and can save process water 4,000,000,000 M every year ³

Contain positively charged ions such as precious metal and heavy metal in the electroplating wastewater, sulfuric acid is arranged, hydrochloric acid, negatively charged ion such as nitric acid and phosphoric acid again.This waste water enters rivers,lakes and seas, can poison the water body animal, makes fishes and shrimps death.This waste water irrigation field is polluted grain vegetables fruit, enters the people and knows from experience various refractory diseases such as producing cancer.So serious problem pendulum is in face of us, and it is greatly disturbed to cause us, evokes the enthusiasm of our innovation and creation.

3.0 the content of our patent of invention: at first the waste water (generally containing 1-5mg/L) that contains precious metal is carried out dc electrolysis with electrochemical process.Negative plate that electrolysis is used and positive plate all adopt the stainless steel plate of Ni and Cr contained titanium.Connect direct supply and carry out electrolysis, make the gold in the waste water, silver, rhodium, precious metal ions such as palladium are deposited on slowly on the negative electrode stainless steel plate surface and form film.When thickness 0.5mm is above, just can peel, be back to the production of electroplating precious metal plating.Then the waste water of remainder enter with other waste water blended water collecting basin in, concentrate to administer.

Other electroplating wastewater is as zinc-containing water, copper-containing wastewater, and nickel-containing waste water, chromate waste water, stanniferous waste water, lead waste water contains iron waste water, aluminium wastewater, cobalt-containing wastewater, phosphorus-containing wastewater, acid-bearing wastewater and contain alkali waste water etc. and all come together in the water collecting basin.

Decide the pH value of waste water earlier with the PH instrumentation, with sulfuric acid or sodium hydroxide adjustment the pH value of waste water is controlled in PH7 ± 0.2 scope again.(1) in waste water, adds the 1st kind of additive sulfuric acid calcium, i.e. H 188-1 additive.Addition is 1 ‰ (ratio of the liquid weight of waste water and calcium sulfate (technical pure) solid weight equals 1000 to 1, and additive is added in the waste water be dissolved into saturated solution in water after) stirring and evenly mixing.(2) in waste water, add second kind of additive sodium formiate again, it is the G188-2 additive, addition is that 1 ‰ (ratio of the liquid weight of waste water and sodium formiate (technical pure) solid weight equals 1000 to 1) additive is added in the waste water after dissolving in water, and stirred.(3) or in waste water, add the 3rd kind of additive ethanol be the P188-3 additive to replace sodium formiate (G188-2 additive) addition be 1 ‰ (ratio of the liquid weight of waste water and ethanol P 188-3 (technical pure) weight equals 1000 to 1), direct interpolation is advanced in the waste water and need do not stirred.(4) natural microorganism, the above listed additive (being substratum) of liking eating of existing in the electroplating wastewater.The pollutent in the above listed waste water of eating simultaneously.Because microorganism eats behind the substratum, raise up seed fast in about 5-6 hour, behind the pollutents such as the heavy metal of eating, body weight heightens, so the microorganism that contains pollutent precipitates from waste water rapidly, thereby has purified waste water.After supernatant water reaches the quality of process water, send back to and be used on the electroplating assembly line producing.Sediment focuses on (additive that can be used as material of construction) by environmental administration after filtering, make original electroplating wastewater become water resources like this, closed cycle is on production line, both can save a large amount of waters, can eliminate electroplating wastewater again environment is brought pollution and harm, receive a large amount of water-saving benefits and environmental benefit.Disappearing of microorganism

Consumption equals their breeding amount, can control balance in administering the waste water process.4.0 the present invention is based on chemistry, electrochemistry, chemical engineering design, biological chemistry, biology, microbiology, and physical comprehensive theory and technology.Also be more than 40 year study and work experiences of inventors, and disclose relevant documents and materials complex reasoning both at home and abroad and create out 5.0 purposes of the present invention 3 points are arranged: 1. eliminate the electroplating wastewater environmental pollution.2. save annual about 4,000,000,000 M of process water ³3. reduce by ten thousand yuan of the present qualified discharge of the cost of electroplating wastewater equipment: A. (it is not thorough to administer electroplating wastewater) the about 50-100 of suite of equipment.B. innovation (administering thoroughly) suite of equipment only needs ten thousand yuan of 30-50.C. at present external as Sweden state RECYCLEAN company is ten thousand yuan of 400-500 in Beijing to our quotation (administering thorough) suite of equipment valency.Its method and apparatus structural principle is strictly maintained secrecy, and others knows nothing.But its price is than our many ten times.

Claims

This patent " electroplating waste water resource " is that electroplating wastewater is administered by chemistry, electrochemistry, biological chemistry, biology and physics complex art, make it to purify the quality level that reaches process water, be back to Electroplating Production, save a large amount of electroplating waters, eliminate the electroplating wastewater contaminate environment.Wherein following technical characterictic is asked for protection as the claim part.

1, electroplate in the kind precious metal electroplatings such as gold and silver, rhodium, palladium are arranged, bullion content reaches 1-5mg/L in its washes, thus should first electricity consumption chemical recovery precious metal, then remaining waste water and other waste water centralized treatments, in order to avoid the loss precious metal.
2, naturally in the electroplating wastewater have a microorganism, this microorganism has the metal positive ion in the waste water of eating, the negative ion of soda acid salt, and the characteristic of harmful poisonous compound.This patent promptly utilizes the characteristic of this microorganism to purify liquid waste, and makes it to reach the quality level of process water.
3, the H188-1 additive is a technical pure calcium sulfate, and this is the substratum that microorganism love is eaten in the electroplating wastewater, and addition is 1 ‰ (weight ratio, thousandths) in waste water.
4, the G188-2 additive is a sodium formiate, is that microorganism is liked to eat supporting substratum in the electroplating wastewater, and addition is 1 ‰.
5, the P188-3 additive is an ethanol, also is that microorganism is liked to eat supporting substratum in a kind of electroplating wastewater, and addition is 1 ‰.
6, the P188-4 additive is a clorox, as disinfectant, kills residual microorganism in the pure water after purification.
7, P188-5 sulfuric acid and sodium hydroxide neutral chemical agent make the pure water PH=7 after the purification, make waste water become water resources, are back to Electroplating Production again.