Sludge tempering pre-treatment method

A sludge conditioning and sludge technology, which is applied in water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, special treatment targets, etc., can solve the problems of long concentration time, high conditioning cost, and volume reduction Less obvious problems, to achieve the effect of improving dehydration effect and efficiency

Inactive Publication Date: 2015-05-13
DONGGUAN DONGYUAN ENVIRONMENTAL TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Most domestic sewage treatment plants use lime as the sludge conditioner. The activated sludge discharged from the secondary settling tank is concentrated and then conditioned. The traditional lime method and other conditioning treatments reduce the volume of sludge, but its reduction In order to achieve the ideal effect of sludge dewatering, the concentration time is often longer and the conditioning cost is higher; and, it only changes the polarity of the sludge particles, and does not harm the sludge. Hazardous substances such as pathogens and microorganisms in the sludge still exist in the wet sludge after dehydration and conditioning

Method used

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Embodiment Construction

[0017] In the embodiment of the present invention, before the conditioning of the sludge, the sludge is pretreated with ozone and PAM flocculant. The specific treatment method is as follows:

[0018] First, the sludge from the secondary sedimentation tank is transported to the ozone contactor through the sludge pump, and the ozone is generated by the ozone generator, and the ozone is passed into the ozone contactor through the aeration pipe. In this embodiment, the addition amount of the ozone is 10kg to 15kg / T, of course, it can also be set according to the type of sludge actually treated; ozone aeration makes the sludge fully contact with ozone, and uses the strong oxidative property of ozone to destroy the cell wall and cell membrane in the sludge that are not easily biodegradable. , leading to cell death, making cellular substances dissolve in water quickly, and killing pathogens and bacteria in sludge at the same time. Therefore, ozone has a strong killing effect on tenaci...

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Abstract

The invention discloses a sludge tempering pre-treatment method which comprises the following steps: (1) conveying sludge of a secondary sedimentation tank to an ozone contactor; (2) introducing ozone to the ozone contactor by virtue of an aerating pipe for ozone aeration to realize full contact of sludge and ozone, destroying cell walls and cell membranes which are hardly biodegraded in sludge by virtue of strong oxidizing property of ozone to relatively quickly dissolving cell matters in water and killing pathogens and bacteria in sludge at the same time so as to carry out preliminary harmless and reduction treatment of the sludge; (3) then adding a PAM flocculant into the ozone contactor for colloidal flocculation so as to greatly reduce the volume of the sludge. Therefore, the reduction effect is obvious by using ozone and the PAM flocculant and the harmless treatment is carried out on the sludge.

Description

technical field [0001] The invention relates to the technology in the field of sludge treatment, in particular to a pretreatment method for sludge conditioning. Background technique [0002] The water content of sludge produced in sewage treatment plants is generally very high, so sludge dehydration is required to achieve reduction treatment, and the fluid sludge (with or without concentration) is converted into solid wet sludge. Conditioner for sludge dehydration and conditioning. Most domestic sewage treatment plants use lime as the sludge conditioner. The activated sludge discharged from the secondary settling tank is concentrated and then conditioned. The traditional lime method and other conditioning treatments reduce the volume of sludge, but its reduction In order to achieve the ideal effect of sludge dewatering, the concentration time is often longer and the conditioning cost is higher; and, it only changes the polarity of the sludge particles, and does not harm the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C02F11/14
CPCC02F11/06C02F11/14C02F2303/06
Inventor 肖应东
Owner DONGGUAN DONGYUAN ENVIRONMENTAL TECH CO LTD
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