City-life-sludge resource utilization technology

A technology for urban domestic sludge and resource utilization, which is applied in the field of urban domestic sludge resource utilization technology, can solve the problems of secondary pollution, high energy consumption, poor economic benefits, etc., and achieves the effect of high stability

Inactive Publication Date: 2017-01-04
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the harmless disposal rate of sludge produced by sewage treatment plants across the country is less than 60%, and the remaining sludge is disposed of by "temporary means"
[0005] At present, there is no systematic disposal plan for sludge, which leads to high energy consumption, poor economic benefits, incomplete treatment, and secondary pollution problems in the sludge treatment process.

Method used

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  • City-life-sludge resource utilization technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The sludge resource utilization process of the present invention, such as figure 1 shown. Put the treated sludge of urban domestic sewage into the mixing tank, add ferric chloride and polyferric sulfate to it, and send it to filter plate for dehydration after stirring. After dehydration, the water content in the sludge is reduced to 50%. An air inlet is set above the stirring tank and the filter press plate, and the emitted odor is sent to the adsorption and deodorization device equipped with activated carbon. The adsorption device is set up with two towers, one tower for adsorption and the other tower for regeneration. After the adsorbent is saturated, it is used for subsequent pyrolysis flue gas regeneration, and then blows with air cold, and the two towers are alternately performed.

[0044] After chemical conditioning and dehydration, the sludge is sent to the fermenter for anaerobic fermentation through the conveying device. The fermentation temperature is 40°C, t...

Embodiment 2

[0050] The sludge resource utilization process of the present invention, such as figure 1 shown. Put the treated sludge of urban domestic sewage into the mixing tank, add polyacrylamide to it, and send it to filter plate for dehydration after stirring. After dehydration, the water content in the sludge is reduced to 60%. An air inlet is set above the filter plate to send the emitted odor to the adsorption deodorization device equipped with alumina. The adsorption device is set up with two towers, one tower for adsorption and the other tower for regeneration. After the adsorbent is saturated, it is used for subsequent pyrolysis flue gas regeneration, and then blows with air cold, and the two towers are alternately performed.

[0051] After chemical conditioning and dehydration, the sludge is sent to the fermenter for anaerobic fermentation through a conveying device. The fermentation temperature is 70°C, the fermentation time is 5 days, and the stirring frequency is 8h / time. T...

Embodiment 3

[0057] The sludge resource utilization process of the present invention, such as figure 1 shown. Put the treated sludge of urban domestic sewage in the mixing tank, add polyacrylamide to it, and send it to filter plate for dehydration after stirring. After dehydration, the water content in the sludge is reduced to 55%. An air inlet is set above the filter plate to send the emitted odor to the adsorption deodorization device equipped with silica gel and molecular sieve. The adsorption device is set up with two towers, one tower for adsorption and the other tower for regeneration. After the adsorbent is saturated, it is used for subsequent pyrolysis flue gas regeneration, and then blows with air cold, and the two towers are alternately performed.

[0058] After chemical conditioning and dehydration, the sludge is sent to the fermenter for anaerobic fermentation through the conveying device. The fermentation temperature is 60°C, the fermentation time is 4 days, and the stirring ...

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Abstract

The invention relates to a city-life-sludge resource utilization technology, and belongs to the technical field of sludge treating. The technology includes the steps of chemical conditioning and dewatering, tail gas adsorbing and deodorizing, sludge anaerobic fermenting, fermentation-biogas purifying, sludge drying, digested-sludge rotating-bed pyrolyzing, pyrolyzed oil-gas separating and purifying, fluidized-bed gasifying and sewage treating. By means of the city-life-sludge resource utilization technology, resource utilization of sludge is achieved, sewage, solid waste and waste gas are discharged in a standard-meeting mode, and meanwhile city gas or cement or common bricks with the high economic value is / are produced. Parts of unit technologies in the city-life-sludge resource utilization technology are current mature industrial technologies, and stability is high; combustible substances are concentrated to a pyrolysis bed to be used as fuel, and heat of all units is comprehensively used. The city-life-sludge resource utilization technology is high in sludge treatment capacity and stability, economical, environmentally friendly, capable of saving energy and high in resource utilization rate.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a resource utilization process of urban domestic sludge. Background technique [0002] With the continuous advancement of new urbanization, the number of urban sewage treatment plants has increased rapidly, and the centralized treatment of urban sewage has given birth to urban sludge, a product that cannot be ignored. On the one hand, the sludge precipitated after sewage treatment contains toxic substances such as pathogens, insect eggs, and heavy metals. Without effective treatment and disposal, it is easy to cause secondary pollution to groundwater and soil; Nutrients such as organic matter and trace elements can be properly handled to realize the recycling of resources. [0003] The sewage treatment capacity of cities and towns in my country has reached a capacity of 151 million tons per day, resulting in an annual output of more than 35 million tons of u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14C02F11/12C02F11/04C02F11/10B01D53/02C10L3/10C10J3/56C10J3/72C02F101/30
CPCB01D53/02B01D2253/10B01D2253/102B01D2253/104B01D2253/116C02F11/00C02F11/04C02F11/10C02F11/122C02F11/14C02F2101/30C02F2303/02C02F2303/10C10J3/56C10J3/72C10J2300/0946C10J2300/0956C10J2300/0976C10J2300/1207C10J2300/1606C10J2300/1628C10J2300/1807C10L3/103C10L3/104C10L3/106Y02E50/30Y02W10/20Y02W10/40
Inventor 陈耀壮欧阳李科李洁王磊乔莎张云贤许光文
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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