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Urban sludge treating method and equipment

A technology of municipal sludge and treatment methods, applied in the direction of sludge treatment, sludge treatment, biological sludge treatment, etc., can solve the problems of low sludge treatment efficiency and poor effect, shorten digestion time, simplify dehydration process, The effect of biogas yield improvement

Active Publication Date: 2013-06-12
CSD BEIJING E P DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the technical problem of low sludge treatment efficiency and poor effect in the municipal sludge treatment method, and simultaneously provides a kind of municipal sludge treatment equipment

Method used

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  • Urban sludge treating method and equipment

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Effect test

Embodiment 1

[0020] The primary sludge and excess sludge of the sewage treatment plant are mixed and thickened, and the sludge volume is 250 tons / day (water content 96%), and the dry solid content is 10,000 kg / day. Use municipal sludge treatment method of the present invention to process, comprises the steps:

[0021] In the first step, the sludge that needs to be treated, such as primary sludge and excess sludge, is first pretreated (pretreatment is the same as the prior art and includes homogeneity, etc.) to form concentrated sludge (about 92% moisture content), concentrated sludge The sludge is firstly heated by the heat exchanger 7 and the temperature rises to 55°C; then, the high-temperature concentrated sludge is pumped into the 3 In the cylindrical high-temperature hydrolysis acidification reactor 5, the high-temperature hydrolysis acidification reaction is carried out. During this process, the high-temperature hydrolysis acidification reactor 5 is heated and kept warm by the heater...

Embodiment 2

[0033] The primary sludge and excess sludge of the sewage treatment plant are mixed and concentrated, and the sludge volume is 75 tons / day (water content 80%), and the dry solid content is 15,000 kg / day. Use municipal sludge treatment method of the present invention to process, comprises the steps:

[0034] In the first step, the pretreated concentrated sludge (water content 92%) is first heated by the heat exchanger 7 and the temperature rises to 50°C; then, the high-temperature concentrated sludge is pumped into a cylindrical high-temperature hydrolysis tank with an effective volume of 965.6m3 In the acidification reactor 5, the high-temperature hydrolysis acidification reaction is carried out. During this process, the heater 6 heats and keeps the temperature of the high-temperature hydrolysis acidification reactor 5 at 45°C to provide the heat required for anaerobic digestion. The pH value of the sludge in the hydrolytic acidification reactor 5 is controlled at 6.5, and the...

Embodiment 3

[0040] The primary sludge and excess sludge of the sewage treatment plant are mixed and thickened, and the sludge volume is 500 tons / day (water content 94%), and the dry solid content is 30,000 kg / day. Use municipal sludge treatment method of the present invention to process, comprises the steps:

[0041] In the first step, the pretreated concentrated sludge (with a water content of 92%) is first heated by the heat exchanger 7 and the temperature rises to 45°C; then, the high-temperature concentrated sludge is pumped into an effective volume of 761.3m 3 In the cylindrical high-temperature hydrolysis acidification reactor 5, the high-temperature hydrolysis acidification reaction is carried out. During this process, the high-temperature hydrolysis acidification reactor 7 is heated and kept warm by the heater 6, so that its temperature is kept at 55° C. to provide anaerobic digestion. required heat, the pH value of the sludge in the high temperature hydrolysis acidification react...

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Abstract

The invention provides an urban sludge treating method, which comprises the following steps of: heating concentrated sludge to 45-55 DEG C, feeding into a high-temperature hydrolytic acidification reactor, and undergoing a high-temperature hydrolysis anaerobic digestion reaction at the pH 6.5-7.5 and at the temperature 40-55 DEG C for 2-5 days to obtain a hydrolytic acidification product; lowering the temperature of the hydrolytic acidification product to 35-40 DEG C, feeding into a medium-temperature methane producing digestion reactor, and undergoing a medium-temperature hydrolysis anaerobic digestion reaction at the temperature 35-38 DEG C for 10-17 days to obtain marsh gas and digested sludge; desulfurizing the marsh gas; and dehydrating the digested sludge to produce dehydrated sludge and digestive fluid. According to the method, resource, minimization and harmlessness of urban sludge treatment are fully realized. The invention further discloses urban sludge treating equipment, which comprises the medium-temperature methane producing digestion reactor, a dehydrator, a desulfurizing tower, a high-temperature hydrolytic acidification reactor and a heat exchanger, wherein a heater is arranged on the high-temperature hydrolytic acidification reactor. The equipment has a simple overall structure, and is easy to realize.

Description

technical field [0001] The invention relates to a method and equipment for treating urban sludge, in particular to a method for recycling, reducing and harmless treatment of primary sludge, excess sludge and chemical sludge in urban sewage treatment plants. Background technique [0002] With the increasing construction of urban sewage treatment plants in my country, the rate of urban sewage treatment has increased rapidly, the generation of urban sludge has increased sharply, and the problems of sludge treatment and disposal have become increasingly prominent. At present, most of the urban sewage treatment plants in our country use concentrated and dehydrated sludge to transport to landfill or use it as agricultural fertilizer. Biomass energy in municipal sludge has not been fully utilized, resulting in waste of resources and energy. Compared with other sludge treatment technologies, the use of anaerobic digestion technology can not only reduce and stabilize sludge, but als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04C02F11/12C10L3/10
CPCY02E50/30Y02W10/20
Inventor 李彩斌邵凯王立宁
Owner CSD BEIJING E P DEV CO LTD
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