High recovery sulfate removal process

A high-recovery, sulfate-based technology, applied in chemical instruments and methods, water treatment parameter control, water/sludge/sewage treatment, etc., can solve problems such as low material supply, high cost, and excessive fouling

Inactive Publication Date: 2011-10-12
EVOQUA WATER TECH PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microporous or ultrafiltration membranes are high cost processes and are prone to excessive fouling and loss of capacity with high solids content sediment
Also, ion exchange softeners are a high cost method for treating low value feeds such as acid mine drainage and would be ineffective due to the low pH of the feed

Method used

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Examples

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Embodiment Construction

[0018] The high recovery process for sulfate removal involves treating a feed water stream from a source with a reverse osmosis membrane system to produce a purified water permeate stream and a waste stream containing trapped or rejected ions and organic matter. This waste stream is further processed to remove dissolved and suspended species. Water from this waste stream is blended with the feed water stream after treatment. The removed solids are collected as a slurry or slurry and disposed of in a manner consistent with applicable regulations.

[0019] The goal of the method described here is to run with high recovery. Recovery is defined as the ratio of the flow rate of the permeate to the flow rate of the input feed stream.

[0020] figure 1 A simplified diagram of the method is shown. Water from the source enters the feed collection tank (100) at flow F, where it is mixed with reverse osmosis antiscalant (which is of small volume and not considered in the discussion ...

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Abstract

A high recovery sulfate removal process comprises treating a feed water stream conditioned with antiscalant from a source with a reverse osmosis membrane system to produce a purified water permeate stream and a reject stream containing the retained or rejected ions and organic matter. The reject stream is further treated to remove dissolved and suspended species. The reject stream flows to a desaturation / clarification process. A preferred process includes a constant stirred tank reactor (CSTR) where co - precipitation agent is added followed by a clarifier. Water recycled from the clarifier overflow is blended with feed water stream. The removed solids are collected as sludge or a slurry and disposed of in a manner consistent with applicable regulations.

Description

field of invention [0001] The present invention relates to a method of removing sulfate from water sources, and more particularly, to a high recovery method utilizing reverse osmosis to remove sulfate from water sources. Background of the invention [0002] High levels of sulfate in water sources can cause problems for wetlands and the wildlife that inhabits them. An example of high concern is the high levels of sulfate entering the Everglades, which are reported to be 60-100 times the normal background. Sulfate stimulates microbial sulfate reduction (MSR), in which sulfate-reducing bacteria (SRB) produce sulfide from sulfate during the degradation of inorganic substances, and it controls the release of neurotoxic methylmercury (MeHg) in the Everglades Methylation and bioaccumulation. MeHg is a potent neurotoxin that accumulates in fish and other wildlife. Other toxic effects of high levels of sulphate are the generation of hydrogen sulphide and accelerated release of nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44
CPCC02F1/441C02F1/5236C02F1/66C02F5/08C02F9/00C02F2001/007C02F2101/101C02F2103/10C02F2209/06
Inventor G·亚历山大S·R·卡斯R·伍德林K·萨思鲁南
Owner EVOQUA WATER TECH PTE LTD
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