Heavy metal wastewater purificant

A purification agent and heavy metal technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as difficult control, difficult treatment of concentrated water, easy membrane pollution, etc., and achieve the effect of reducing pressure

Inactive Publication Date: 2009-02-04
SHENZHEN BANGYOUTONG TECH
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AI Technical Summary

Problems solved by technology

This method has simple process, easy operation, and low construction and operation costs, but the disadvantage is that the pH range of the optimal precipitation of various heavy metal ions is different, and it is necessary to add medicine to the precipitation in stages. If complex ions are mixed in the wastewater, some It is difficult to discharge ions
The ion exchange method is to use the exchange ions in the ion exchange resin to exchange some ions in the heavy metal wastewater to remove them, so that the wastewater can be purified. The disadvantage of this method is that the price of the resin is relatively expensive, and the operating cost is high. Difficult to regenerate, hard to handle concentrated water
Electrodialysis is an electrochemical separation process. It is a membrane process that uses potential difference as the driving force under the action of a direct current electric field to separate

Method used

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Embodiment Construction

[0011] The purifying agent for heavy metal wastewater provided by the present invention mainly consists of diatomaceous earth and metal sulfides, and simultaneously adds sulfites, carbonates and aluminum salts. The mass percentages of various components are 30%-35% of diatomite, 20%-30% of metal sulfide, 18%-23% of sulfite, 5%-10% of aluminum salt, and 2% of carbonate ~27%.

[0012] The present invention will be described in detail below by taking diatomaceous earth, calcium sulfide, sodium sulfite, calcium carbonate and aluminum chloride as specific examples.

[0013] --Sodium sulfite: Because some heavy metal wastewater contains chromium, but generally exists in the form of hexavalent chromium ions, which cannot be directly removed. It is necessary to convert the hexavalent chromium into trivalent chromium, so a certain amount of sodium sulfite is added in the medicament of the present invention. to restore hexavalent chromium. The specific reaction is as follows:

[0014...

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Abstract

The invention belongs to the technical field of industrial water treatment and relates to a wastewater purifying agent, in particular to the purifying agent for processing various industrial wastewater (in particular to electroplating wastewater) containing heavy metals. The active ingredients of the purifying agent comprise diatomaceous earth, metal sulfide, sulfite, carbonate and aluminium salt, the percentage contents by weight of various ingredients are as follows, the diatomaceous earth is 30 percent to 35 percent, the metal sulfide is 20 percent to 30 percent, the sulfite is 18 percent to 23 percent, the aluminium salt is 5 percent to 10 percent, and the rest is the carbonate. The wastewater purifying agent can effectively solve the problems of complicated technology, mixed and unclear water quality and complicated electroplating additive of the prior electroplating production technology, thereby leading the wastewater to stably achieve the standards for a long time after the treatment.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment and relates to a waste water purifying agent, in particular to a purifying agent for treating various industrial waste water (especially electroplating waste water) containing heavy metals. Background technique [0002] There are many methods for the treatment of heavy metal wastewater, such as alkaline precipitation, ion exchange, electrodialysis, reverse osmosis, electrocoagulation, etc. At present, the most widely used method is the alkaline precipitation method, which is a method of removing heavy metal ions by forming hydroxide precipitation only by adding alkali to adjust the pH value. This method has simple process, easy operation, and low construction and operation costs, but the disadvantage is that the pH range of the optimal precipitation of various heavy metal ions is different, and it is necessary to add drugs to the precipitation in stages. If complex ions are mixe...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/52C02F1/28C02F1/70
Inventor 王树新范林
Owner SHENZHEN BANGYOUTONG TECH
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