High-temperature aerobic fermentation method for sludge
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An aerobic fermentation and high temperature technology, applied in sewage/sludge fertilizers, botany equipment and methods, planting substrates, etc., can solve the problems of high moisture content of fermentation products, high operating costs, large initial investment, etc., and reach the fermentation temperature High, early investment savings, low operating costs
Inactive Publication Date: 2018-07-31
上海尚泥环境科技有限公司
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[0005] The object of the present invention is to overcome the problems existing in the existing sludge aerobic fermentation process, such as long fermentation period, large floor area, large fermentation odor, high moisture content of fermentation product
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[0051] Example 1
[0052] The dehydrated sludge produced by the sewage treatment station of a pharmaceutical factory in Shanghai has a production volume of 1t / d and a moisture content of 82%. The process of the present invention has been used for high-temperature aerobic fermentation, such as figure 1 As shown, it specifically includes the following steps:
[0053] (1) Mixed conditioning
[0054] The sludge, auxiliary materials (sawdust) and re-admixture (clinker) bins are conveyed by a screw conveyor with metering function, and the mass ratio is controlled to 1:0.4:1, using a mixing conditioner (screw conveying mixing mixer) Mix thoroughly to adjust the C / N ratio and moisture content of the mixture to 35:1 and 60% respectively. The moisture content of sludge, sawdust, and re-admixture were 82%, 15% and 20%, respectively.
[0055] (2) Thermophilic aerobic fermentation
[0056] The mixture and high-temperature aerobic fermentation compound strain enter the aerobic fermentation tank th...
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[0064] Example 2
[0065] The dehydrated sludge produced in the sewage treatment station of a paper mill in Hainan has an output of 400t / d and a moisture content of 80%. The process of the present invention has been used for high-temperature aerobic fermentation, such as figure 1 As shown, it specifically includes the following steps:
[0066] (1) Mixed conditioning
[0067] The sludge, auxiliary materials (straw), and remix (clinker) bins are conveyed by a screw conveyor with metering function, and the mass ratio is controlled to 1:0.4:1, using a mixing conditioner (screw conveying mixing mixer) Mix thoroughly to adjust the C / N ratio and moisture content of the mixture to 25:1 and 50%, respectively. The moisture content of sludge, straw, and remix is 82%, 15% and 20%, respectively.
[0068] (2) Thermophilic aerobic fermentation
[0069] The mixture and high-temperature aerobic fermentation compound strain enter the aerobic fermentation tank through the automatic cloth machine. Th...
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Abstract
The invention discloses a high-temperature aerobic fermentation method for sludge. The method includes the steps of blending sludge, auxiliary materials and remixed materials, and adjusting the C/N ratio and moisture content of the sludge to (25-35):1 and 50-60% respectively; blending a mixture formed after treatment in step A with a high-temperature aerobic composite microbial inoculant for fermentation; screening a fermented material after fermentation in step B is finished and then completing the whole process. According to the method, the auxiliary materials and the remixed materials are utilized to adjust the C/N ratio and moisture content of the sludge, automatic control over process parameters such as a material preparation proportion, pile overturning frequency, fermentation temperature and oxygen content is achieved, and a waste heat recovery device is utilized to achieve waste heat recovery and reutilization. The process has the advantages that the automation degree is high,the fermentation temperature is high, the fermentation cycle is short, the energy consumption and the running cost are low, slight odor is produced, and the moisture content of the fermented materialis low. By means of the process, fast harmlessness, stabilization and recycling of urban sludge can be achieved, a circular economy principle is satisfied, and the method has a broad application prospect.
Description
technical field [0001] The invention relates to the technical field of sludge aerobic fermentation, in particular to a sludge high-temperature aerobic fermentation method. Background technique [0002] With the rapid development of urbanization, the amount of urban domestic sewage and industrial wastewater treatment has increased rapidly, and the output of sewage treatment appendage sludge has greatly increased. How to treat and dispose of these sludge, make it harmless and make effective use is a common problem in all countries in the world. An issue that deserves attention. In my country, data show that more than 90% of the built sewage treatment plants do not have supporting facilities for sludge treatment; secondary pollution. [0003] At present, domestic sludge treatment methods mainly include aerobic fermentation, anaerobic digestion, incineration, and landfill. Most of the sludge from urban sewage treatment plants in my country is mainly piled up, and some of it en...
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