Method for treating comprehensive electroplating wastewater

A technology for electroplating wastewater and wastewater, which is applied in the fields of metallurgical wastewater treatment, water/sewage treatment, flotation water/sewage treatment, etc. It can solve problems such as difficult water discharge, difficult treatment of concentrated water, and difficult recovery of heavy metals, and reduce production costs. Effect

Inactive Publication Date: 2010-09-15
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems faced by the traditional chemical process, such as difficult to reach the standard of effluent, difficult to treat concentrated water in the reuse water system, and difficult to recycle heavy metals, the present in

Method used

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  • Method for treating comprehensive electroplating wastewater
  • Method for treating comprehensive electroplating wastewater
  • Method for treating comprehensive electroplating wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Embodiment 1 Inline method

[0046] An electroplating industrial park in Shenzhen City contains various types of electroplating, and its daily sewage discharge is 3,000 tons, and the influent water quality indicators are:

[0047] Table 1 Sewage water quality of five kinds of sewage Unit: mg / L

[0048]

[0049]

[0050] 1. Chromium-containing wastewater

[0051] Chromium-containing wastewater enters the pH value adjustment tank from the adjustment tank, and then enters the chromium reduction tank. A pH automatic control system and an ORP automatic control system are installed in the reduction tank. The pH control system automatically controls the amount of acid added to adjust the wastewater The pH is 2.5-3, and at the same time, the ORP value of the wastewater reaches 250-300mV by controlling the amount of reducing agent added through the ORP automatic control system. After reducing the chromium-containing wastewater, add alkali-dosing equipment, pH value adjus...

Embodiment 2

[0079] Embodiment 2: the method of reuse

[0080] An electroplating industrial park in Shenzhen City contains various types of electroplating, and its daily sewage discharge is 5,000 tons, and the influent water quality indicators are:

[0081] Table 1 Sewage water quality of five kinds of sewage Unit: mg / L

[0082]

[0083]

[0084] 7. Chromium-containing wastewater

[0085] Chromium-containing wastewater enters the pH value adjustment tank from the adjustment tank, and then enters the chromium reduction tank. A pH automatic control system and an ORP automatic control system are installed in the reduction tank. The pH control system automatically controls the amount of acid added to adjust the wastewater The pH is 2.5-3, and at the same time, the ORP value of the wastewater reaches 250-300mV by controlling the amount of reducing agent added through the ORP automatic control system. After reducing the chromium-containing wastewater, add alkali-dosing equipment, pH valu...

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Abstract

The invention relates to a method for treating comprehensive electroplating wastewater. The electroplating wastewater is separated and the recycling utilization rate of heavy metals resources can be improved by carrying out targeted treatment on each strand of separated water while improving the treatment efficiency. By using the micro-electrolysis function of iron and carbon, complex can be removed while removing COD (Chemical Oxygen Demand) and the biochemical property can be improved, which provides the guarantee for a subsequent biochemical reaction. By using the displacement action of the ion and the carbon, heavy metal ions in the water can be displaced and heavy metal resources can be recycled. Meanwhile, residual heavy metal ions in the water can be recycled by using the combining action of precipitating hydroxides and sulfides. On the basis, the water quality can meet the standard by using the ultrafiltration and reverse osmosis actions. The total hardness and the electric conductivity of the wastewater are superior to the water quality of tap water. Usable metal resources can be recycled, the economic benefit is obtained while achieving the aim of environmental protection and the production cost can be reduced.

Description

technical field [0001] The invention relates to a treatment method for comprehensive electroplating wastewater, in particular to using a process combining chemistry and biochemistry in the treatment of comprehensive electroplating wastewater, and using a stripping method to remove ammonia nitrogen that is difficult to reach the standard in the water. Background technique [0002] In the electroplating industry, commonly used plating types include nickel plating, copper plating, chrome plating, zinc plating, cadmium plating, etc. The sources of waste water are quite extensive, one is: ①Waste water from cleaning of plating parts; All kinds of tank fluids and drains that run, run, drip, and leak; ④ Equipment cooling water, except for cooling down during use, the cooling water of the equipment is not polluted by heavy metals. Among them, the plating cleaning water is the main source of electroplating wastewater, accounting for almost 80% of the workshop wastewater discharge. E...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/461C02F1/24C02F1/52C02F1/66C02F101/16C02F101/18C02F101/22C02F103/16
Inventor 孙宝盛周冬冬齐庚申刘然朱文亭阳习龙牟洁
Owner TIANJIN UNIV
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