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RO dense water standard discharge technology in reclaimed water reuse

A concentrated water and reclaimed water technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc., can solve reverse osmosis membrane non-fouling clogging, reclaimed water reuse concentrated water can not meet the discharge standard , reverse osmosis can not run for a long time and other problems, to achieve the effect of solving the fouling of reverse osmosis membrane and solving the effect of reverse osmosis not being able to run for a long time

Inactive Publication Date: 2011-09-21
上海瑞勇实业有限公司
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, and provide a RO concentrated water up-to-standard discharge process for reclaimed water reuse, which solves the problem that the reclaimed water cannot be discharged up to the standard, and also solves the problem of non-fouling and clogging of reverse osmosis membranes. and the problem that reverse osmosis cannot run for a long time

Method used

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  • RO dense water standard discharge technology in reclaimed water reuse
  • RO dense water standard discharge technology in reclaimed water reuse
  • RO dense water standard discharge technology in reclaimed water reuse

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 2 As shown, a process for reusing RO concentrated water up to the standard for reclaimed water includes the following processing steps: a) adding high-concentration concentrated water into the electrolytic cell, and using electrolysis to remove part of the metal ions; b) electrolytically treated Adjust the pH value of the wastewater to 8-9 to make metal ions form hydroxide precipitates, then add flocculant to make hydroxide precipitates form larger alum flower precipitates, the precipitates are collected by pressure filtration, and the precipitated supernatant enters the next treatment Step; c) adding the precipitated supernatant after precipitation treatment to a quartz sand filter for filtration to remove suspended matter and large particles in the water; the quartz sand filter uses quartz sand with a particle size of φ...

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Abstract

The invention discloses an RO dense water standard discharge technology in reclaimed water reuse. The technology comprises the following processing steps: electrolysis, flocculation precipitation, quartz sand filtration, bag filtration, active carbon filtration, heavy metal capture, filtration with fine filter and the like, making high density dense water to reach discharge standard and discharge. The technology solves the problem that 35% of dense water produced by reclaimed water reuse equipment can not reach the discharge standard. Waste water processed with the technology goes through a reverse osmosis treatment and reaches the recycle utilization standard. Simultaneous, the problems of severe blocking of reverse osmosis membrane and breakdown of equipment are solved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a standard-reaching RO concentrated water discharge process for reclaiming middle water. Background technique [0002] The composition of electroplating wastewater is very complex. In addition to cyanide-containing wastewater and acid-base wastewater, heavy metal wastewater is a potentially harmful category of wastewater in the electroplating industry. Therefore, the discharge of electroplating wastewater must be strictly controlled, properly treated and disposed of, otherwise the consequences will be serious. [0003] Such as figure 1 As shown, it is a kind of electroplating waste water recycling treatment process in the prior art, which includes (1) adjusting the pH value to 2 to 3 and adding pyro-sub-reductant to reduce hexavalent chromium to low-toxic trivalent chromium; 2) Adjust the pH value to 8.5-9.5 to make the trivalent chromium form hydroxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/461C02F1/28C02F1/52C02F1/62C02F1/44
Inventor 张勇安
Owner 上海瑞勇实业有限公司
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