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Electroplating wastewater reusing technology combined with seawater desalination technology

A kind of electroplating wastewater and technology, which is applied in the field of water treatment, can solve the problems of high operating cost, short membrane life, and difficult cleaning, and achieve the effects of avoiding secondary pollution, high utilization rate, improving water production efficiency and service life

Inactive Publication Date: 2019-03-26
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the application of membrane treatment technology can realize the reuse of wastewater and heavy metals, it has the problem of high operating cost due to the short life of the membrane, easy pollution, and difficult cleaning.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] In this embodiment, the following steps are adopted to treat electroplating wastewater.

[0029] Step 1-1. After the electroplating wastewater is settled in the primary sedimentation tank, the supernatant wastewater is injected into the adjustment tank, and inorganic alkali agents such as NaOH and KOH or inorganic acid agents such as HCl and sulfuric acid are added to adjust the pH to 9-10. Adjust according to the pH of the wastewater.

[0030] Step 1-2, pump the wastewater whose pH has been adjusted by the adjustment tank into the coagulation reaction tank, add coagulant (coagulant such as PAM) and coagulant (coagulant such as PAC) to carry out coagulation and sedimentation.

[0031] Step 1-3, the effluent from the coagulation tank is then adjusted with HCl, sulfuric acid and other inorganic acid agents, and the pH is adjusted back to 6-8 for further processing.

[0032] Step 2, filter the water treated in steps 1-3 through quartz sand and precision filter, pump bacte...

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Abstract

The invention provides an electroplating wastewater reusing technology combined with a seawater desalination technology. The electroplating wastewater reusing technology is characterized by comprisingthe following processing steps: pretreatment process, reverse osmosis treatment process and concentrated water treatment process, wherein the electroplating wastewater is subjected to repeated precipitation and coagulation treatment in the pretreatment process, and the electroplating wastewater after reaching the standard is treated in the reverse osmosis treatment process; a brackish water reverse osmosis membrane is adopted in the reverse osmosis treatment process, and the recovery rate is preset within 50-65%; the concentrated water treated in the reverse osmosis treatment process is treated in the concentrated water treatment process; a sea water desalination reverse osmosis membrane is adopted in the concentrated water treatment process, and the reused water treated under the pressure at 3-4MPa is directly discharged. The invention provides a method for efficiently treating wastewater to the electroplating industry; the method is capable of achieving the purpose of deeply reusingthe electroplating wastewater; the method is economical and practical.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a recycling process of electroplating wastewater combined with seawater desalination technology. Background technique [0002] my country's water resource shortage and water pollution problems are becoming more and more serious. From the perspective of development, reclaimed water reuse is one of the effective ways to improve the utilization rate of water resources. Reclaimed water mainly refers to non-potable water that can be reused within a certain range after sewage treatment reaches a certain water quality standard. Reuse of reclaimed water can save water resources, improve the comprehensive utilization rate of water resources, prevent pollution, and is conducive to the sustainable development of social economy. With the development of modern industry, the problem of a large amount of sewage discharge has become increasingly prominent. Electroplating is one of the three majo...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/001C02F1/441C02F1/50C02F1/52C02F1/66C02F5/08C02F5/14C02F9/00C02F2001/007C02F2103/16Y02A20/131
Inventor 张金山夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH