Dynamic operation method of sludge advanced anaerobic digestion system based on argillaceous characteristics

An anaerobic digestion system, dynamic operation technology, applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve the problems of low organic matter degradation rate, low organic matter content, long residence time, etc., and achieve operability Strong, extensive engineering application value, the effect of improving performance and stability

Active Publication Date: 2022-03-04
NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sludge from urban sewage treatment plants in my country has the characteristics of low organic matter content and low C / N, which lead to problems such as long residence time and low organic matter degradation rate in traditional anaerobic digestion. Technical measures such as collaborative digestion of organic waste such as garbage to improve the efficiency of sludge anaerobic digestion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The organic content of dewatered sludge from an urban sewage treatment plant is 59.34-60%, C / N is about 7.3, and pH is 6.31-6.86. When sludge is used for anaerobic digestion alone, the water content, temperature and digestion time of the sludge are controlled to 88 ~90%, 35±0.5℃, and 19.8d, the organic matter degradation rate, unit sludge gas production, and unit organic matter removal gas yield of the digestive system were 19.3~20.9% (average 20.1%), 6.6~9.3 (average 7.6m 3 / m 3 ), 0.60~0.77 (mean 0.66m 3 / kgVS); using alkali thermal hydrolysis pretreatment, pressure, temperature, digestion time and alkali dosage are 0.14Mpa, 124℃, 45min and 0.04gNaOH / gVS respectively, the parameters of the anaerobic digestion unit are the same, the organic matter in the digestion system The degradation rate, gas production per unit of sludge, and gas production per unit of removal of organic matter were 23.8 to 26.3% (average 24.8%), 12.1 to 17.0 (average 13.7 m 3 / m 3 ), 0.75~1.04...

Embodiment 2

[0029] The organic content of sludge in an urban sewage treatment plant is 66.26-67.44%, C / N 5.6, and pH is 6.01-6.77. When sludge is used for separate anaerobic digestion, the water content, temperature and digestion time of the sludge are controlled to be 88-88 90%, 35±0.5℃, 20d, the organic matter degradation rate of the digestion system, the unit gas production of sludge, and the gas production per unit of removal of organic matter are 24.0~30.7% (average 27.6%), 10.03~12.2m 3 / m 3 (11.6m 3 / m 3 ), 0.58~0.72m 3 / kgVS (mean 0.66m 3 / kgVS); using alkaline thermal hydrolysis pretreatment, pressure, temperature, digestion time, alkali dosage were 0.14Mpa, 124℃, 40min, 0.02gNaOH / gVS, the parameters of the anaerobic digestion unit were the same, the organic matter in the digestion system was The degradation rate, gas production per unit of organic matter, and gas production per unit of organic matter removed are 34.2 to 41.8% (average 37.6%), 16.0 to 19.2 m 3 / m 3 (17.3m 3...

Embodiment 3

[0031] The dewatered sludge of an urban sewage treatment plant is treated with alkaline thermal hydrolysis pretreatment-advanced anaerobic digestion system. The processing performance of synergistic anaerobic digestion, sludge pretreatment alone and mixed with kitchen waste for synergistic digestion.

[0032] The pH of the dewatered sludge cake is 7.10-7.15, the moisture content is 81.89%-82.02%, the organic matter content is 57.53%-57.60%, the C / N is 7.27-7.32, the pH of the kitchen waste is 5.60-6.60, and the moisture content is 84.03 %~88.02%, organic matter content is 86.22%~88.92%, C / N is 22.12~23.10.

[0033] Sludge pretreatment was carried out by anaerobic digestion alone, and the pressure, temperature, residence time and alkali dosage of the alkaline thermal hydrolysis pretreatment unit were controlled to be 0.14MPa, 124℃, 45min, 0.02gNaOH / gVS, respectively, and the anaerobic digestion unit was fed into the sludge. The solid content, temperature, and digestion time ar...

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Abstract

The invention discloses a dynamic operation method of a sludge advanced anaerobic digestion system based on argillaceous characteristics, and belongs to the technical field of environmental protection. According to the method, sludge of a municipal sewage treatment plant is taken as a treatment object, and according to seasonal fluctuation characteristics of sludge quality, key control parameters of a pretreatment unit and an anaerobic digestion unit of a sludge advanced anaerobic digestion system and a feeding ratio of kitchen waste and other organic substrates to sludge cooperative treatment are optimized and regulated; a sludge advanced anaerobic digestion system dynamic operation method based on mud characteristics is constructed, and the purpose of synergistic interaction of sludge treatment, pollution reduction and carbon reduction is achieved. The operation efficiency and stability of a sludge advanced anaerobic digestion system can be remarkably improved, the sludge energy regeneration efficiency is improved, and meanwhile cooperative treatment and energy regeneration recycling of organic matrixes such as kitchen waste, excrement and agricultural waste can be achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for dynamic operation of a sludge advanced anaerobic digestion system based on mud characteristics. Background technique [0002] In recent years, with the continuous improvement of my country's urbanization level, the construction of urban sewage treatment plants has developed rapidly, the sewage treatment rate has increased significantly, and the amount of sludge generated has increased significantly. As of the end of 2019, urban sewage treatment plants have The amount of dry sludge produced reached about 12.32 million tons. Sludge, as the carrier of most pollutants in sewage, will cause secondary pollution to the environment and a large amount of energy waste if it cannot be properly treated and disposed of. [0003] Anaerobic digestion of sludge uses facultative anaerobic bacteria and obligate anaerobic bacteria to carry out biochemical r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/00
CPCC02F11/04C02F11/00
Inventor 申世峰郭兴芳李劢顾淼熊会斌陶润先
Owner NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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