CN101318732B

CN101318732B - Process for recycling electroplating waste to prepare pure water

Info

Publication number: CN101318732B
Application number: CN2008101230503A
Authority: CN
Inventors: 马楫; 林振锋; 陈茂林
Original assignee: SUZHOU SUJING ENVIROMENTAL TECHNOLOGY Co Ltd; Jiangsu Sujing Group Co Ltd
Current assignee: SUZHOU SUJING ENVIROMENTAL TECHNOLOGY Co Ltd; Jiangsu Sujing Group Co Ltd
Priority date: 2008-06-19
Filing date: 2008-06-19
Publication date: 2010-06-30
Anticipated expiration: 2028-06-19
Also published as: CN101318732A

Abstract

The invention relates to a process for reclaiming electroplating waste water to produce pure water. The process comprises the following steps that: the electroplating waste water containing heavy metal ion undergoes pretreatment, nanofiltration and reverse osmosis separation in turn so as to generate pure water used for production; during the pretreatment, the electroplating waste water is filtered by a mechanical filter, an active carbon filter and a security filter in turn so as to generate primary water; during the nanofiltration, the primary water passes through a nanofiltration system, and impurities including the heavy metal ion in the primary water are intercepted by a nanofiltration membrane element; moreover, more than 90 percent of the primary water passes through the nanofiltration membrane element so as to generate high-purity secondary water; and during the reverse osmosis separation, the secondary water passes through an anti-pollution membrane reverse osmosis element so as to obtain pure water used for production. The pure water reclaimed through the process can be directly used in electroplating production, thereby minimizing the cost of electroplating process.

Description

Reclaim the technology of electroplating waste to prepare pure water

Technical field

The present invention relates to method of electroplating wastewater treatment, particularly a kind of technology that reclaims electroplating waste to prepare pure water.

Background technology

Electroplating industry is the important processing industry of China, and the whole nation is electroplated producer and surpassed 15000 families, and the electroplating wastewater of annual discharging has 400,000,000 tons approximately.The various industrial chemicals that electroplating wastewater contains heavy metal and adds in the electroplating technology process, belong to high-concentration hardly-degradable trade effluent and high density poisonous and harmful waste water, if not treated directly discharging then can cause serious environmental to pollute, and is very harmful to the mankind.

At present, domestic electroplating industry generally adopts terminal method of chemical treatment to carry out the Pollution abatement of electroplating wastewater, though adopt this method can reach qualified discharge, but there is the working cost problem of higher, more crucial is to adopt this method can't reduce the consumption and the discharged waste water of electroplating feed liquid from the source.Therefore,, must reform technical process, in source and process, reduce the generation of pollutent, in the production treating processes, effectively reclaim resource simultaneously in electroplating industry, carrying out cleaner production.

Application number is that the Chinese invention patent application that 200510043669.X, name are called " integrated barrier separation of the electroplating effluent recycles craft and apparatus " discloses electroplating wastewater successively through pre-treatment, sodium filter, reverse-osmosis treated, by the sodium filter univalent ion in the electroplating wastewater is separated with heavy metal ion, obtain the high-quality concentrated solution that contains heavy metal, this concentrated solution is recyclable to be reused to coating bath, in order to guarantee that heavy metal is separated fully with univalent ion, need carry out repeatedly cyclical operation.Simultaneously, the liquid that sees through that obtains after the reverse osmosis is recycled to the supplementary feed that is recycled and reused for electroplate rinsing in the electroplate rinsing groove, so reaches the cleaner production that reduces cost and realize electroplating industry.But owing to need carry out repeatedly cyclical operation, and the pure water after handling can only reach the requirement of rinsing water, and the amplitude that cost reduces is also little.In Electroplating Production, it is very high to the purity requirement of water especially to electroplate the raw material water, finally can make water of productive use from common water through a series of purifying process, but cost is higher like this.

Summary of the invention

Technical problem to be solved by this invention provides a kind of technology that reclaims electroplating waste to prepare pure water, and the pure water that reclaims through this technology is directly used in Electroplating Production, can realize the electroplating technology minimization of cost.

For solving above technical problem, the present invention takes following technical scheme:

A kind of technology that reclaims electroplating waste to prepare pure water, the electroplating wastewater that contains heavy metal ion successively through must produce after pre-treatment, sodium filter and the reverse osmosis isolation use pure water, pre-treatment be meant with electroplating wastewater successively by mechanical filter, activated charcoal filter and security personnel's strainer filter primary water; Described sodium filter is meant passes through the sodium filtering system with described primary water, comprises in the primary water that the impurity of heavy metal ion is held back by sodium filter membrane element, and the primary water more than 90% sees through sodium filter membrane element and gets highly purified secondary water; Described reverse osmosis isolation is meant, described secondary water must be produced after by the pollution-resistant membrane ro components and use pure water.

Primary water is after the sodium filter, and the heavy metal ion that comprises that sees through sodium filter membrane element concentrates recovery plating starting material in interior condensed water.

Because the enforcement of above technical scheme, the present invention compared with prior art has following advantage:

Reclaim technology by this, the waste water more than 90% is recovered as to produce uses pure water, can directly be used as electroplating water; In addition, after the sodium filter, be used for electroplate technology or recycle no matter contain the condensed water of heavy metal ion, significantly reduce with respect to wastewater flow rate owing to concentrate the water yield, processing cost all significantly reduces.Therefore, the technology of this recovery electroplating waste to prepare pure water can realize the electroplating technology minimization of cost.

Description of drawings

Fig. 1 is a process flow sheet of the present invention.

Embodiment

The present invention will be described in detail below in conjunction with specific embodiment:

Referring to accompanying drawing 1, a kind of technology that reclaims electroplating waste to prepare pure water, it in turn includes the following steps:

(1), pre-treatment, mainly be that electroplating wastewater is obtained primary water by mechanical filter, activated charcoal filter, security personnel's strainer successively.

Pretreated main purpose is to remove mechanical impurity in the former water, suspended substance, microorganism, colloid, dissolved gas (be primarily aimed in the water chlorine residue etc.) and other inorganic, organic pollutant, protection subsequent disposal unit.

(2), sodium filter, the main sodium filtering system that adopts with sodium filter membrane element, make primary water under mesolow, by sodium filter membrane element, the impurity that comprises heavy metal ion is trapped within the concentrated solution, seeing through liquid is the secondary water with higher degree, after the sodium filter, concentrated liquid measure is below 10% of electroplating wastewater amount, be mainly heavy metal ion and organism in the concentrated solution, can reclaim or handle qualified discharge, significantly reduce, can reduce the recycling cost or reduce the heavy metal ion amount of discharging significantly owing to concentrate the water yield.With every day 100 tons of copper-containing wastewaters be example, by the 1mg/l emission standard, traditional technology is handled qualified discharge, the cupric ion that enters environment is grams every days 100; If adopt the RO system, the cupric ion that enters environment is grams every days 30; The cupric ion that adopts our rule to enter environment is grams every days 10.

(3), reverse osmosis isolation, mainly adopted the pollution-resistant membrane ro components, allow water under the mesohigh situation, by this element, the univalent ion of trace obtains producing and uses pure water in dewatering, this pure water can be directly used in Electroplating Production.Because contain organic pollutant in the water, thus general reverse osmosis membrane can not be adopted, otherwise the very fast contaminated obstruction of film.

The above-mentioned concentrated solution that comprises heavy metal ion that obtains from step (2) reclaims electroplates starting material, thereby reclaims resource.

In sum, do not need in waste water, to add special-purpose Waste water treatment medicament (adjusting bronsted lowry acids and bases bronsted lowry, PAC, the PAM etc. of pH value), thereby reduce disposal cost; Independent collection is directly adopted sodium filter and counter-infiltration to combine and can be prepared into the pure water of need of production, the minimizing construction costs to suitable waste water; Adopt sodium filter and counter-infiltration to combine and replace traditional two-pass reverse osmosis processing method, can reduce the discharge capacity of dense water, greatly reduce total amount of pollutants discharged and ambient pollution burden; Dense water to sodium filter system and counter-infiltration system discharge concentrates, and can reclaim the plating raw material, thereby reclaims resource. In view of above advantage, the present invention can realize minimumization of electroplating technology cost.

Claims

1. technology that reclaims electroplating waste to prepare pure water, it is characterized in that: the electroplating wastewater that contains heavy metal ion is used pure water through producing after pre-treatment, nanofiltration and the reverse osmosis isolation successively, described pre-treatment be meant with electroplating wastewater successively by mechanical filter, charcoal filter and security personnel's strainer filter primary water; Described nanofiltration is meant passes through nanofiltration system with described primary water, comprises in the primary water that the impurity of heavy metal ion is held back by the nanofiltration membrane element, and the primary water more than 90% sees through the nanofiltration membrane element and gets highly purified secondary water; Described reverse osmosis isolation is meant described secondary water by the pollution-resistant membrane ro components, makes to produce to use pure water.

2. the technology of recovery electroplating waste to prepare pure water according to claim 1 is characterized in that: primary water is after nanofiltration, and the heavy metal ion that comprises that sees through the nanofiltration membrane element concentrates recovery plating starting material in interior condensed water.