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Treatment method for recycled water and application thereof

A treatment method and technology for reclaimed water, applied in biological water/sewage treatment, water/sludge/sewage treatment, aerobic process treatment, etc. The effect of saving chemical costs, eliminating sludge treatment costs, and facilitating operation management

Active Publication Date: 2013-09-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the operation, the dosage is large, and more sedimentary sludge is generated, which requires subsequent treatment, and the operating cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This example is used to illustrate the treatment method for reclaimed water provided by the present invention.

[0036] Water quality of reclaimed water source: The effluent of a municipal sewage treatment plant in a certain city has a COD value of 70mg / L, BOD / COD=0.15, and a suspended matter content of 40-80mg / L.

[0037] At 25°C, under aeration conditions, the reclaimed water and biologically activated sludge are contacted in the reaction tank, the hydraulic retention time is 25 hours, and the ratio of aeration gas to water (0.5:1) makes the amount of dissolved oxygen in the water 4mg / L, the concentration of the biologically active sludge in water is 50mg / L;

[0038] Pass the above-mentioned reclaimed water through a double-layer filter material filter tank (the thickness of anthracite is 300mm, and the thickness of quartz sand is 500mm), and the filtration rate is 8m / h;

[0039] The COD of the effluent treated by the above-mentioned "active microbial flocculation-f...

Embodiment 2

[0041] This example is used to illustrate the treatment method for reclaimed water provided by the present invention.

[0042] Water quality of reclaimed water source: The effluent of a municipal sewage treatment plant in a certain city has a COD value of 80mg / L, BOD / COD=0.16, and a suspended matter content of 50-80mg / L.

[0043] At 30°C, under the condition of aeration, reclaimed water and biologically activated sludge are contacted in the reaction tank, the hydraulic retention time is 35 hours, and the ratio of aeration gas to water (0.4:1) makes the amount of dissolved oxygen in the water 3mg / L, the concentration of activated sludge in water is 60mg / L;

[0044] Pass the above-mentioned reclaimed water through a double-layer filter material filter tank (the thickness of anthracite is 300mm, and the thickness of quartz sand is 500mm), and the filtration rate is 8m / h;

[0045] The COD of the effluent treated by the above-mentioned "active microbial flocculation-filtration" c...

Embodiment 3

[0047] This example is used to illustrate the treatment method for reclaimed water provided by the present invention.

[0048] Water quality of reclaimed water source: the effluent of a municipal sewage treatment plant in a certain city has a COD value of 60mg / L, BOD / COD=0.11, and a suspended matter content of 40-60mg / L.

[0049] At 10°C, under the condition of aeration, reclaimed water and biologically activated sludge are contacted in the flocculation tank, the hydraulic retention time is 30 hours, and the ratio of aeration gas to water (0.5:1) makes the amount of dissolved oxygen in the water 3.5mg / L, the concentration of activated sludge in water is 45mg / L;

[0050] Pass the above-mentioned reclaimed water through a double-layer filter material filter tank (the thickness of anthracite is 300mm, and the thickness of quartz sand is 500mm), and the filtration rate is 8m / h;

[0051] The COD of the effluent treated by the above-mentioned "active microbial flocculation-filtrat...

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Abstract

The invention discloses a treatment method for recycled water and application thereof. The COD (Chemical Oxygen Demand) value of the recycled water is below 100 mg / L. The method comprises the following steps of: under an aeration condition, contacting the recycled water with active microorganisms, so that impurities in the recycled water are adsorbed and flocculated by the active microorganisms under a contacting condition; and separating floccules of the active microorganisms which adsorb the impurities from the recycled water, wherein relative to 1 liter of recycled water, the using quantity of the active microorganisms is 10-200mg. In the method disclosed by the invention, impurities in the recycled water can be effectively adsorbed, flocculated and separated out without adding a large quantity of chemical flocculating agents since the adsorption and flocculation functions of the active microorganisms on the impurities in water are fully utilized under a certain condition, so that the content of water suspended matters and the COD are effectively lowered, and the medicament cost of the conventional method is saved.

Description

technical field [0001] The invention relates to a method for treating reclaimed water and its application. Background technique [0002] As the second water source for cities, urban reclaimed water (hereinafter referred to as reclaimed water) has the characteristics of large water volume, stable water quality, reliable source and no need for long-distance water diversion. It is a renewable water resource for sustainable development in the future. Reuse of reclaimed water can effectively solve the shortage of water resources, improve the reuse rate of water resources and reduce sewage discharge, which has huge social benefits and good economic benefits. [0003] Although the concentration of pollutants in reclaimed water meets the national discharge standards and the water quality is better than industrial sewage, some indicators are still poor and cannot meet the water quality requirements of industrial production, such as COD, suspended solids and microorganisms. Therefore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/02C02F3/34
CPCY02W10/10
Inventor 桑军强马欣张利强李本高
Owner CHINA PETROLEUM & CHEM CORP
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