Process and plant for treating a water stream

A water flow and pretreatment technology, applied in water/sewage treatment, sustainable biological treatment, chemical instruments and methods, etc., to achieve the effect of reducing the concentration and color of dissolved organic carbon

Inactive Publication Date: 2011-11-02
CENT GIPPSLAND REGION WATER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic contaminants removed by reverse osmosis have been found to be prone to several types of fouling, making them ineffective for organic removal
Further problems, as identified in US 5529697, include the fragility of the membranes, and possible problems arising from the costs associated with operating filtration systems capable of handling large volumes of water

Method used

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  • Process and plant for treating a water stream
  • Process and plant for treating a water stream
  • Process and plant for treating a water stream

Examples

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Embodiment Construction

[0025] Reference now figure 1 , Shows a water treatment plant 100, which includes two anaerobic reactors (AR1 and AR2) to produce treated water and biogas (biogas). AR1 and AR2 supply the pretreated influent water to the aeration tank and membrane bioreactor ("MBR") system (AB1 / MOS1 and AB2 / MOS2). The anaerobic reactor treats untreated influent as a combination of domestic sewage and industrial wastewater received from kraft pulp and paper mills through a special wastewater pipeline through a digestion process.

[0026] Anaerobic digestion by microorganisms is assisted by adding a nutrient mixture of microorganisms, such as a sludge stream from activated sludge or primary sludge. Sufficient nutrients should be provided in order to provide sound biomass and acceptable biological digestion, thereby reducing decomposable organic carbon (commonly also referred to as biochemical oxygen demand ("BOD")) to a satisfactory level. The total chemical oxygen demand ("COD") through the react...

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Abstract

A process for treating a water stream containing dissolved organic carbon and dissolved salts comprises subjecting the water stream to reverse osmosis after a pre-treatment step to reduce the amount of dissolved organic carbon directed in water to the reverse osmosis treatment step. The preferred pre-treatment step is a membrane treatment step such as nanofiltration. The process enables treatment of complex effluents including mixtures of domestic and industrial effluents. Treated water may be recycled and a treatment plant (100) employing the process forms another aspect of the invention.

Description

Technical field [0001] The present invention relates to a method (process) and equipment (plant or plant) for treating a water stream containing dissolved organic carbon (dissolved organic carbon) and dissolved salt (dissolved salt). Background technique [0002] Many water streams contain dissolved organic carbon in the form of compounds that can act as colorants, making the water unsuitable for use, recycling, or disposal. The water flow of major concern is effluent (effluent) from pulp and paper mills. The pulp and paper industry generates large amounts of waste water, which causes operating costs and potentially environmental costs if not properly treated. Therefore, the treatment of wastewater from this industry has received great attention and research. [0003] Generally, wastewater from pulp and paper mills is highly colored and usually brown colored. US Patent No. 6,896,806 states that brown wastewater is mainly organic in nature, which is mainly attributed to dissolved...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/56C02F101/30B01D61/00C02F9/00
CPCB01D61/025C02F1/441B01D61/022C02F2103/28B01D2311/2688C02F3/30C02F2103/30B01D61/027C02F9/00B01D2311/04B01D61/04C02F1/56C02F3/1273Y02W10/10B01D61/026B01D2311/2649
Inventor 戴维·埃文斯安德鲁·霍德金森
Owner CENT GIPPSLAND REGION WATER
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