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High-efficiency in situ biogas slurry denitrification method for anaerobic digestion of sludge

An anaerobic digestion and sludge technology, applied in anaerobic digestion treatment, chemical instruments and methods, sludge treatment and other directions, can solve problems such as no related reports, achieve high process stability, promote hydrolysis process, meet carbon The effect of the demand on the source

Inactive Publication Date: 2018-06-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the traditional low-solids anaerobic digestion process, the biogas slurry is usually denitrified and dephosphorized, and then returned to the sewage treatment plant for treatment; there is no relevant method or process for the in-situ denitrification method or process of the biogas slurry with high ammonia nitrogen concentration in the anaerobic digestion of sludge. to report

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  • High-efficiency in situ biogas slurry denitrification method for anaerobic digestion of sludge

Examples

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Effect test

Embodiment 1

[0036] The dewatered sludge of a sewage treatment plant has a solid content of 25% (moisture content of 75%) and is treated by anaerobic digestion process. After anaerobic digestion and dehydration, the ammonia nitrogen content in the biogas slurry is 3000mg / L, and the ammonia nitrogen nitrosation is realized under the conditions of 30°C, DO=0.3~0.8mg / L, HRT=24h using the original temperature of the biogas slurry. The conversion rate of ammonia nitrogen can reach 95%. The biogas slurry after nitrosation is mixed with fresh dewatered sludge (with a solid content of 25%), and the mixed sludge has a solid content of 15%, and enters the nitrous acid oxidative hydrolysis phase of the sludge anaerobic digestion system. The nitrous acid oxidative hydrolysis phase controls the temperature at 75°C and the residence time is 2 days. A large amount of sludge disintegrates and dissolves organic matter in this phase, and nitrite oxidizes macromolecular organic matter, which is reduced to ni...

Embodiment 2

[0038]The dewatered sludge of a sewage treatment plant has a solid content of 20% (moisture content of 80%) and is treated by anaerobic digestion process. After anaerobic digestion and dehydration, the ammonia nitrogen content in the biogas slurry is 2400mg / L. Using the original temperature of the biogas slurry, the ammonia nitrogen nitrosation is realized under the conditions of 30°C, DO=0.3~0.8mg / L, and HRT=20h. The conversion rate of ammonia nitrogen can reach 95%. The biogas slurry after nitrosation is mixed with fresh dewatered sludge (with a solid content of 20%), and the mixed sludge has a solid content of 13%, and enters the nitrous acid oxidative hydrolysis phase of the sludge anaerobic digestion system. The nitrous acid oxidative hydrolysis phase controls the temperature at 55°C, and the residence time is 3 days. A large amount of sludge disintegrates and dissolves organic matter in this phase, and nitrite oxidizes macromolecular organic matter, which is reduced to n...

Embodiment 3

[0040] The dewatered sludge of a sewage treatment plant has a solid content of 17% (moisture content of 83%) and is treated by anaerobic digestion process. After anaerobic digestion and sludge dehydration, the ammonia nitrogen content in the biogas slurry is 2000mg / L. Using the original temperature of the biogas slurry, the ammonia nitrogen nitrosation is realized under the conditions of 30°C, DO=0.3~0.8mg / L, and HRT=18h. The conversion rate of ammonia nitrogen can reach 95%. The biogas slurry after nitrosation is mixed with fresh dewatered sludge (17% solid content), and the mixed sludge has a solid content of 10%, and enters the nitrous acid oxidative hydrolysis phase of the sludge anaerobic digestion system. The nitrous acid oxidative hydrolysis phase controls the temperature at 35-37°C, and the residence time is 4 days. In this phase, a large amount of disintegration and dissolution of organic matter occurs in the sludge. The nitrite oxidizes the macromolecular organic mat...

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Abstract

The invention discloses a high-efficiency in situ biogas slurry denitrification method for anaerobic digestion of sludge. The method comprises the following steps: mixing and diluting dewatered sludgewith a nitrosated biogas slurry to obtain a sludge mixed solution with the solid content being 10-15%; conveying the sludge mixed solution to a nitrite oxidative lysing hydrolysis phase, and performing lysing pretreatment to complete the denitrification of nitrites; conveying the obtained pretreatment solution to anaerobic digestion to produce a gas phase in order to complete the degradation of organic matters and the preparation of biogas; and conveying the digested sludge to a dewatering machine, dewatering the digested sludge, post-treating stabilized biogas residues, nitrosating the high-ammonia nitrogen biogas slurry, and then returning the nitrosated biogas slurry to a mixing tank for the mixing and dilution with the dewatered sludge. The method has the advantages of concise denitrification flow, realization of in situ denitrification in the anaerobic digestion process, improvement of the sludge lysing hydrolysis effect by using nitrous acid, improvement of the anaerobic methanogenesis capability, minimization of the capital cost and the occupied land, and simplicity and easiness in operation.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment and resource utilization, in particular to a high-efficiency in-situ biogas slurry denitrification method for anaerobic digestion of sludge. Background technique [0002] With the rapid development of urbanization in my country and the continuous increase of sewage treatment scale, the problem of sludge treatment and disposal in sewage plants has become increasingly serious. Requirements for sludge recycling and energy utilization are gradually attracting attention. Sludge anaerobic digestion technology is the focus of future sludge recycling and energy utilization because it can recover biomass energy such as methane. [0003] The removal of high-concentration ammonia nitrogen contained in the biogas slurry discharged from the anaerobic digestion system is the bottleneck problem in the development of the sludge anaerobic digestion process. As the anaerobic digestion technology is be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/12C02F11/00C02F3/28C02F101/16
CPCC02F3/28C02F11/00C02F11/04C02F11/121C02F2101/16C02F2303/06
Inventor 董滨卢怡清邱瞧清王有晴陈思思戴晓虎
Owner TONGJI UNIV
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