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Method for resource utilization of sludge compost

A technology of recycling and sludge, applied in the direction of sewage/sludge fertilizer, application, organic fertilizer, etc.

Inactive Publication Date: 2016-08-17
WUXI GUOLIAN ENVIRONMENTAL SCI & TECH
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Problems solved by technology

[0006] The sludge composting resource utilization method of the present invention discloses a new scheme, which adopts a pretreatment scheme of aerobic fermentation combined with adding bio-based auxiliary material pyrolysis sludge, and adopts a process method of anaerobic digestion filtrate recovery of biogas and biogas slurry, and solves the problem of Solved the problems caused by the anaerobic treatment of sludge, and enabled the sludge to be used in depth as a resource

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  • Method for resource utilization of sludge compost

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[0019] The concentrated sludge of an urban sewage treatment plant has a moisture content of 84.1%, a pH value of 7.3, an organic matter of 51%, a bio-based auxiliary material with a moisture content of 38.3%, a pH value of 2.6, an organic matter of 82%, and a blending ratio of 30% (sludge dry basis). The material is subjected to pyrolysis treatment at a high temperature of 190°C, the pressure is 1.2MPa, and the pyrolysis time is 60min. The material after pyrolysis contains 64% of organic matter, the temperature of the material after pyrolysis treatment is cooled to 70°C, and it is directly pumped into the plate and frame filter press (2×800m 2 ) dehydration, feeding time 30min, pressure 0.4MPa, pressing pressure 0.6MPa, production cycle 1.5h, mud cake contains 62% organic matter, about 1.7% total nitrogen, about 2.7% total phosphorus, about 0.5% total potassium, sludge and The organic nutrients of the auxiliary materials enter the filtrate, and the sludge is reduced. The mud ...

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Abstract

The invention relates to a method for resource utilization of a sludge compost. The method comprises a sludge and biological accessory mixing pyrolysis pre-treatment process, a pretreatment material strengthen dehydration process, a press-filtration mud cake enclosed aerobic compost fermentation process and a sludge filtrate anaerobic gas production process. The method solves the problems of unreasonable nutritive proportion, difficult release of endogenous substances, low gas productivity and biogas quality, difficult dehydration of the terminal sludge, low fertilizer efficiency of the compost, long aerobic compost period, and high operation cost, has the advantages of short aerobic compost period, low energy consumption, low charging water content, good raw material mud quality and good heavy metal stabilization effect, various added agents in the prior art can be saved, sludge quantitative reduction and resource effect are obvious, the prepared organic fertilizer is safe and reliable, and the sludge quantitative reduction and deep resource utilization can be simultaneously realized.

Description

technical field [0001] The invention relates to a method for resource utilization of domestic sludge, in particular to a method for resource utilization of domestic sludge composting, belonging to the field of domestic sludge treatment. Background technique [0002] Domestic sludge is a dark brown aqueous mixture composed of various microbial flora, organic matter and inorganic matter. Domestic sludge not only has high water content, is easy to rot, and has a strong unpleasant smell, but also contains organic nutrients. And heavy metals and other substances will cause serious pollution if they are directly discharged into the outside world without treatment. In recent years, with the promotion of biotechnology, the discharge of sewage sludge has increased significantly, and the harmless resource treatment of sewage sludge is an urgent problem to be solved. The sludge treatment methods of sewage plants mainly include landfill, incineration and direct land use, etc. These met...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/00
CPCY02A40/20Y02E50/30Y02W30/40
Inventor 杨叙军宋联朱葛王红军何艳华
Owner WUXI GUOLIAN ENVIRONMENTAL SCI & TECH
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