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Sulfate removal from aqueous waste streams with recycle

A sulfate and recycling technology, applied in energy wastewater treatment, mining wastewater treatment, water pollutants, etc., can solve the problem of no multi-media backwash water recovery, etc.

Inactive Publication Date: 2013-10-09
СИМЕНС УОТЕР ТЕКНОЛОДЖИЗ ПТЕ. ЛТД.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] U.S. Patent Application 13 / 119,275 describes a sulfate removal process using reverse osmosis and desaturation / clarification steps, but without recovery of multimedia backwash water

Method used

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  • Sulfate removal from aqueous waste streams with recycle
  • Sulfate removal from aqueous waste streams with recycle

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Embodiment Construction

[0021] The present inventors conceived and simplified the implementation of a sulfate removal water treatment process with substantially complete process recovery. Process recovery is defined as the ratio of membrane filtration permeate flow to raw water feed flow plus any recirculated water flow. Raw water feedwater is the portion of influent water that enters the process from the water source to be treated. The total body of water flowing into the water treatment process consists of raw water feedwater and recirculated water as will be described. In the described process, substantially all of the concentrated water and the water used to backwash the multimedia filter unit or other pretreatment filters after passing through the sulfate removal process is recycled and returned to the overall process influent.

[0022] "Essentially all" means that the process of the invention continuously recycles all of the water, with only minor losses during normal operation. As will be de...

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Abstract

This invention provides for sulfate removal from a water source by a reverse osmosis (RO) or nanofiltration (NF) process where the concentrate stream is treated to precipitate and remove reject sulfate and recycle the discharged concentrate water and any backwash water used to clean a filter used to prepare feed water for the RO or NF process.

Description

technical field [0001] The present invention provides a process for the removal of sulfate from a water source, and more particularly provides a process for the removal of sulfate by a membrane filtration process in which concentrate water and dirty media backwash water are substantially completely recirculated. Background technique [0002] Acid mine drainage (AMD), also sometimes referred to as acid rock drainage (Acid Rock Drainage), represents a large source of sulphate-laden water. AMD is a general term sometimes used to refer to any mine operation drainage, many of which are alkaline. The main source of AMD comes from the mining industry. Other sources include flue gas scrubbing at power stations, highway construction and other deep digging operations. AMD is derived from pyrite (FeS 2 ) and other sulfide minerals due to oxidation from exposure to water and oxygen. Pyrite is the most abundant sulfide mineral on earth, and many mineral sulfides are associated with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02
CPCC02F1/66C02F2101/101C02F9/00C02F1/5254C02F2103/10B01D61/145C02F1/001C02F1/441C02F1/442B01D61/02C02F1/444Y02W10/37
Inventor K·萨特鲁南L·A·雷耶斯
Owner СИМЕНС УОТЕР ТЕКНОЛОДЖИЗ ПТЕ. ЛТД.