Thermal hydrolysis pretreatment device and process for sludge with high solid content based on anaerobic digestion
A pretreatment device, anaerobic digestion technology, applied in the direction of sludge treatment, biological sludge treatment, pyrolysis treatment of sludge, etc., can solve the problems of long sludge residence time, low treatment efficiency, long residence time, etc., to achieve Good heating effect, high solid content rate of incoming mud and low construction cost
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[0062] Application case 1:
[0063] A sewage treatment plant in a certain city has a treatment scale of 100,000 t / d, a sludge (solid content of 20%) production rate of 50 t / d, and a dry sludge organic matter content of about 40%. If anaerobic digestion is carried out directly, according to the relevant domestic engineering examples, the gas production is almost 0; if the high-efficiency thermal hydrolysis pretreatment process of the present invention is used for anaerobic digestion pretreatment, the entire hydrolysis process and subsequent anaerobic insulation will consume 170℃ steam in total About 10000t / d, equivalent to biogas (CH 4 Content 60~65%) The demand is about 1300m 3 / d, and the gas production of anaerobic digestion after hydrolysis is expected to be 1700m 3 / d, the biogas supply-demand ratio is 1.31, and the remaining biogas product volume is 400m 3 / d.
Example
[0064] Application case 2:
[0065] A sewage treatment plant in a city has a treatment scale of 200,000 t / d, a sludge (solid content of 20%) yield of 100 t / d, and a dry sludge organic matter content of about 50%. If anaerobic digestion is carried out directly, according to the relevant domestic engineering examples, the gas output is about 1000m 3 / d; If the high-efficiency thermal hydrolysis pretreatment process of the present invention is used for anaerobic digestion pretreatment, the entire hydrolysis process and subsequent anaerobic heat preservation will consume 170°C steam totaling about 18,000t / d, which is equivalent to biogas (CH 4 Content 60~65%) The demand is about 2000m 3 / d, and the gas output of anaerobic digestion after hydrolysis is expected to be 5000m 3 / d, the biogas supply-demand ratio is 2.5, and the remaining biogas product volume is 3000m 3 / d.
Example
[0066] Application case 3:
[0067] A sewage treatment plant in a city has a processing scale of 400,000 t / d, a sludge (solid content of 20%) yield rate of 200 t / d, and a dry sludge organic matter content of about 60%. If anaerobic digestion is carried out directly, according to the relevant domestic engineering examples, the gas output is about 5500m 3 / d; If the high-efficiency thermal hydrolysis pretreatment process of the present invention is used for anaerobic digestion pretreatment, the entire hydrolysis process and subsequent anaerobic heat preservation will consume 170°C steam totaling about 32000t / d, which is equivalent to biogas (CH 4 Content 60~65%) The demand is about 3200m 3 / d, and the gas production of anaerobic digestion after hydrolysis is estimated to be 12000m 3 / d, the biogas supply-demand ratio is 3.75, and the remaining biogas product volume is 8800m 3 / d.
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