Method for optimizing rapid composting of municipal sludge through combination of enzymolysis pretreatment and biological enhancement

A technology that combines biological and municipal sludge, applied in the field of solid waste recycling, to achieve the effect of quick start-up of the reactor and obvious effect of nitrogen retention

Pending Publication Date: 2022-01-14
成庆利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Enzymatic hydrolysis pretreatment combined with bioaugmentation to optimize sludge composting can more easily promote compost maturity and nitrogen sequestration, and reduce the release of ammonia and hydrogen sulfide. There is no research yet

Method used

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  • Method for optimizing rapid composting of municipal sludge through combination of enzymolysis pretreatment and biological enhancement
  • Method for optimizing rapid composting of municipal sludge through combination of enzymolysis pretreatment and biological enhancement
  • Method for optimizing rapid composting of municipal sludge through combination of enzymolysis pretreatment and biological enhancement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Compound enzyme hydrolysis pretreatment sludge process:

[0042] Place the remaining sludge of urban sewage treatment plants in a fermentation device for compound enzyme hydrolysis. The compound enzymes include lysozyme: protease: amylase: cellulase in a ratio of 1:1:1:1, and the addition ratio is 3%, 4%. and 5%. Insulate at 45°C, seal and let stand for hydrolysis for 4-8 hours. According to SCOD and pH, the added amount of compound enzyme was determined to be 4%, and the hydrolysis time was 6 hours. Under the same conditions, municipal sludge was anaerobically hydrolyzed as a control.

[0043] Biofortified and mixed material aerobic composting:

[0044] Mix 300mL HS-DO per kg reed stalk powder.

[0045] The pretreated municipal sludge and (reed stalk powder+HS-DO) are mixed according to the mass ratio of wet basis 2kg:500g to obtain the mixed material. The moisture content of the material is 65-70%, and the carbon-nitrogen ratio is 21-25. In the control, reed sta...

Embodiment 2

[0050] Biofortified and mixed material aerobic composting:

[0051] Mix 150mL HS-DO and 150mL phosphate buffer (pH 6.61) per kg reed stalk powder.

[0052] The pretreated municipal sludge and (reed stalk powder+HS-DO) are mixed according to the mass ratio of wet basis 2kg:500g to obtain the mixed material. The moisture content of the material is 65-70%, and the carbon-nitrogen ratio is 21-25. In the control, reed stalk powder was mixed in the same proportion without bioaugmentation.

[0053] Aerobic composting includes three periods: start-up period for 1 day, heat preservation at 45°C; high temperature period for 6 days, temperature ≧50°C; natural decomposition for 6 days.

[0054] The total nitrogen content of the optimized compost product is 39.27mg·g -1 OM, increased by 33.46% compared with the initial stage, compared with the control (34.32mg·g -1 OM) increased by 14.41%, which has a certain nitrogen fixation effect. The cumulative release of ammonia and hydrogen su...

Embodiment 3

[0056] Biofortified and mixed material aerobic composting:

[0057] Mix the pretreated municipal sludge and reed stalk powder according to the wet basis mass ratio of 2kg:500g to obtain the mixed material. The moisture content of the material is 65-70%, and the carbon-nitrogen ratio is 21-25. In the control, reed stalk powder was mixed in the same proportion without bioaugmentation.

[0058] Aerobic composting includes three periods: start-up period for 1 day, heat preservation at 45°C; high temperature period for 6 days, temperature ≧50°C; natural decomposition for 6 days.

[0059] Spray the surface liquid after turning the pile every day. Mainly concentrated in the first four days.

[0060] The total nitrogen content of the optimized compost product is 39.11 mg·g -1 OM increased by 32.91% compared with the initial stage, and increased by 13.93% compared with the control (p-3 , respectively compared with the control 672.86mg·m -3 and 167.09 mg·m -3 A reduction of 22.83%...

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Abstract

The invention provides a method for optimizing rapid composting of municipal sludge through combination of enzymolysis pretreatment and biological enhancement, wherein the method optimizes the sludge composting process and effect by biological enzyme hydrolysis pretreatment of municipal sludge, conditioners such as straws and the like, biological enhancement and a micro-aeration system. The optimal enzymolysis pretreatment adopts lysozyme, protease, amylase and cellulase according to the mass ratio of 1:1:1:1, the enzyme dosage level is 4%, and hydrolysis is carried out for 6 hours at the temperature of 50 DEG C. The biological enhancement mode comprises uniform mixing, spraying and uniform mixing combined spraying. The optimal aerobic composting process period is shortened to 10 days and comprises that the temperature of 45 DEG C in the starting period is maintained for 1 day, the temperature of 50 DEG C in the high-temperature period is maintained for 6 days, and the decomposition is stable for 3 days. A pile is turned once every day, and a liquid is sprayed on the surface layer mainly in the first four days. The method combines enzymolysis pretreatment with biological enhancement to optimize sludge composting, has the characteristics of nitrogen conservation, deodorization, rapidness and the like, and is widely applied to actual treatment of municipal sludge composting.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling, in particular to an enzymatic hydrolysis pretreatment combined with bioaugmentation to optimize urban sludge rapid composting method, using compound enzyme hydrolysis pretreatment, conditioning agents such as straw, micro-aeration system and bioaugmentation bacterial agent Optimizing aerobic composting of municipal sludge. Background technique [0002] In recent years, with the improvement of my country's urbanization development level, the amount of sewage treatment has increased year by year. It is estimated that the amount of urban sludge generated will exceed 60 million m3 from 2020 to 2025. 3 / year (based on a moisture content of 80%). In 2025, the harmless disposal rate of urban sludge in my country will reach 90%, realizing harmless treatment and promoting resource utilization. Aerobic composting is an economical, environmentally friendly, and effective sludge stabilization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F17/20C05F17/50C05F17/70C05F15/00
CPCC05F17/20C05F17/50C05F17/70C05F7/00C05F11/00Y02W30/40
Inventor 成庆利张龙龙王大伟
Owner 成庆利
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