Treatment method for excess sludge

A technology for excess sludge and treatment methods, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve problems such as high cost and easy secondary pollution, and achieve cost The effect of low cost and simple processing technology

Inactive Publication Date: 2012-06-13
BEIJING YIPU INT WATER AFFAIRS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The embodiment of the present invention provides a treatment method of excess sludge, which can solve the problems of high cost and easy secondary pollution in the current

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  • Treatment method for excess sludge
  • Treatment method for excess sludge

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Embodiment

[0046] This embodiment provides a method for treating surplus sludge. The detection indicators of the surplus sludge processed are as follows: sludge moisture content=99.3%, SV 30 =98%, MLSS=5650mg / L, MLVSS=3616mg / L; sludge supernatant COD=22.1mg / L, BOD 5 = 13.48 mg / L.

[0047] The specific processing steps are as follows:

[0048] (1) Pretreatment: send the remaining sludge to the sludge thickening tank for gravity concentration, reducing the moisture content of the sludge to about 98.7%;

[0049] (2) Hydrolysis treatment: the sludge pretreated in step (1) is sent to a closed reaction vessel, and the sludge is hydrolyzed under 4MPa pressure and 200 degrees Celsius to transfer most of the organic matter in the sludge to In the sludge water, the quality of the sludge solids is greatly reduced, and the pathogens in the sludge are killed under the reaction conditions;

[0050] (3) Sedimentation treatment: After the sludge in step (2) is precipitated for 30 minutes, the supernatant liquid...

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Abstract

The invention discloses a treatment method for excess sludge, which belongs to the field of sludge treatment, and includes the steps of pre-treating; feeding the excess sludge to a sludge concentration tank for concentration; feeding the sludge subjected to the pre-treating steps into a closed reaction container and hydrolyzing the sludge at a certain pressure and at a certain temperature; and enabling the sludge subjected to hydrolytic treatment to be quickly deposited, and removing supernatant liquid on the sludge prior to drying the sludge, so that the dried sludge can be directly used as soil. The treatment method is simple in treatment technology, low in cost and capable of effectively treating the sludge which is harmful or easy to cause secondary pollution, so that harmlessness and reduction of the sludge are realized, and the sludge is kept stable.

Description

Technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for treating surplus sludge. Background technique [0002] With the continuous improvement of urban sewage treatment infrastructure, the problem of sludge treatment and disposal in sewage treatment plants in various places is becoming more and more urgent. The amount of sludge produced by the sewage plant is about 0.15% to 1% of the volume of the treated water, and generally every 1kg of BOD is removed 5 Produce 15-100L of activated sludge (moisture content> 95%), the remaining sludge treatment cost is high, accounting for about 25% to 65% of the operating cost of the sewage plant, and the treated sludge accounts for 20% to 50% of the total construction cost. Even 70%. Obviously, any measures that are conducive to reducing excess sludge will bring huge economic benefits. [0003] It is understood that my country’s urban sewage treatment plants basically do not have a strict...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12
Inventor 王俊安刘金泉靳志军李爱华王凯
Owner BEIJING YIPU INT WATER AFFAIRS
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