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Resource utilization method of sludge biogas residue

A technology for recycling and biogas residues, applied in the field of resource utilization of sludge and biogas residues, can solve the problems of high treatment and disposal technology, high energy consumption, complex process routes, etc., to improve decomposition efficiency, reduce sludge energy consumption, The effect of reducing the volume

Inactive Publication Date: 2019-10-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a resource utilization method of sludge and biogas residues. The method utilizes the charcoal produced by pyrolysis of sludge and biogas residues to be reused in the sludge anaerobic digestion treatment system, which can not only improve anaerobic The effect of oxygen digestion treatment of sludge can also solve the problems of high cost, high energy consumption, easy to produce secondary pollution, complex process route and other problems in the existing sludge biogas residue treatment and disposal technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for resource utilization of sludge and biogas residues, the specific steps are as follows:

[0020] (1) Add flocculant polyacrylamide to the raw mud from the sewage plant for dehydration, the volume ratio of flocculant polyacrylamide to raw mud is 8:100, and obtain dewatered sludge with a solid content rate of 20%;

[0021] (2) Anaerobic digestion treatment is performed on the dewatered sludge obtained in step (1), and the anaerobic digestion treatment is under anaerobic conditions at 37° C. for 20 days to obtain digested sludge and generate biogas;

[0022] (3) Drying the digested sludge obtained in step (2), drying at 105°C until the water content is lower than 10%, obtaining solid sludge biogas residue for low-temperature pyrolysis, low-temperature pyrolysis In a nitrogen environment, heat up to 300°C within 45 minutes and heat-preserve and pyrolyze for 3 hours to obtain pyrolytic charcoal;

[0023] (4) The sludge biogas residue pyrolysis carbon in step (3)...

Embodiment 2

[0026] A method for resource utilization of sludge and biogas residues, the specific steps are as follows:

[0027] (1) Add flocculant polyaluminum sulfate to the raw mud from the sewage plant for dehydration, the volume ratio of flocculant polyaluminum sulfate to raw mud is 9:100, and obtain dewatered sludge with a solid content rate of 10%;

[0028] (2) Anaerobic digestion treatment is performed on the dewatered sludge obtained in step (1), the anaerobic digestion treatment is under anaerobic conditions, 38 ° C for 25 days, to obtain digested sludge and generate biogas;

[0029] (3) The digested sludge obtained in step (2) is subjected to drying treatment. The drying treatment is to dry at 60° C. until the water content is lower than 10%, and to obtain solid sludge biogas residue for low-temperature pyrolysis. In a nitrogen environment, heat up to 500°C within 60 minutes and heat-preserve and pyrolyze for 1 hour to obtain pyrolytic charcoal;

[0030] (4) return the sludge b...

Embodiment 3

[0033] A method for resource utilization of sludge and biogas residues, the specific steps are as follows:

[0034] (1) Add flocculant polyferric chloride to the raw mud from the sewage plant for dehydration, the volume ratio of flocculant polyferric chloride to raw mud is 10:100, and obtain a solid content rate of 8% dewatered sludge;

[0035] (2) Anaerobic digestion treatment is performed on the dewatered sludge obtained in step (1), and the anaerobic digestion treatment is under anaerobic conditions at 30° C. for 30 days to obtain digested sludge and generate biogas;

[0036] (3) Drying the digested sludge obtained in step (2), drying at 100°C until the water content is lower than 10%, obtaining solid sludge biogas residue for low-temperature pyrolysis, low-temperature pyrolysis is In a nitrogen environment, heat up to 400°C within 50 minutes and heat-preserve and pyrolyze for 2 hours to obtain pyrolytic charcoal;

[0037] (4) return the sludge biogas residue pyrolytic car...

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Abstract

The invention discloses a resource utilization method of sludge biogas residue. The resource utilization method comprises the steps that a flocculating agent is added to raw sludge from a sewage plantfor dehydration to obtain dehydrated sludge; the obtained dehydrated sludge is subjected to anaerobic digestion treatment to obtain digested sludge and generate biogas; the obtained digested sludge is dried, and obtained solid sludge biogas residue is subjected to low-temperature pyrolysis to obtain pyrolytic carbon; and the sludge biogas residue pyrolytic carbon is added to the dehydrated sludgefor anaerobic digestion treatment. According to the resource utilization method of the sludge biogas residue, the dehydrated sludge is subjected to anaerobic digestion treatment, so that centralizedtreatment of municipal sludge is facilitated, reduction of the sludge is realized, problems of existing anaerobic digestion sludge treatment are solved, and a new method is created; and by optimizingan anaerobic digestion treatment process of a sewage treatment plant, a novel treatment method for sludge treatment stabilization and reduction is provided, the effect of anaerobic digestion treatmentof the sludge is improved, the degree of stability of heavy metal pollutants is improved, "pollution control by pollution" cyclic utilization of resources is achieved, and the sludge production rateis reduced.

Description

technical field [0001] The invention relates to the field of sludge treatment and disposal, in particular to a resource utilization method of sludge and biogas residues Background technique [0002] With the continuous improvement of my country's urbanization level, the construction of sewage treatment facilities has developed rapidly. At the same time, the output of excess sludge has increased sharply, and the situation of municipal sludge treatment and disposal has become increasingly severe. Among the numerous sludge treatment methods, the sludge anaerobic digestion process has the characteristics of high energy recovery and low environmental impact, and is considered an important part of modern sewage treatment plants. The high-solid sludge anaerobic digestion process can directly process dewatered sludge, and has the advantages of small reactor volume, less heat demand, and low operating costs, making the sludge anaerobic digestion process more competitive. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148C02F11/04C02F11/10
CPCC02F11/04C02F11/10C02F11/148Y02W10/40
Inventor 纪艳艳侯艳春陈璐蓓朱晓磊
Owner SHANGHAI UNIV
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