High-temperature aerobic fermentation sludge treatment method and device

Abstract

The invention discloses a high-temperature aerobic fermentation sludge treatment method and device. The problems existing in the prior art such as high moisture content in treated sludge, great odor and the like are solved, and the method and the device have the effects that the process effect is excellent, the operating cost is low, any other pollutant is not produced in the sludge treatment process. According to the technical scheme, the method comprises the following six steps: performing high-temperature aerobic fermentation and strain activation, crushing and mixing materials, adding the materials, fermenting, discharging and performing waste gas treatment.

Description

technical field [0001] The invention relates to the technical field of resource utilization of organic solid waste, in particular to a high-temperature aerobic fermentation sludge treatment method and device. Background technique [0002] At present, my country's urban sewage plants have reached more than 3,000, and the total sludge production in the country has exceeded 30 million tons based on a moisture content of 80%. According to the forecast, by 2020, the sludge output will exceed 60 million tons per year. In Europe and the United States, the infrastructure cost of sludge treatment accounts for as high as 60% to 70% of the total infrastructure cost of sewage treatment plants. The treatment cost of excess sludge accounts for 25% to 40% of the operating cost of the sewage plant, even as high as 60%. In my country, sludge treatment can account for 25% to 65% of the investment and operating costs of the entire sewage plant. Sludge treatment has brought a heavy burden to...

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Problems solved by technology

However, direct incineration of sludge requires large investment and high treatment costs, and the combustion of organic matter is prone to produce highly toxic substances such as dioxins

(2) Landfill: The cost of the anti-seepage layer for sludge landfill treatment is relatively high. If the foundation is not properly treated, it will easily cause secondary pollution of soil and groundwater

The anaerobic fermentation of sludge cannot digest the sludge cleanly, and will produce secondary pollutants. In addition, anaerobic fermentation of sludge will produce about 50% biogas residue, which produces a large amount of biogas residue

(4) Production of cement raw materials: Sludge can replace some clay and limestone as raw materials for cement production, but it needs to be dried and crushed before batching before use, which consumes a lot of energy

Dry incineration and thermal drying of sludge consume high energy and are prone to air pollution; plate and frame filter press cannot fundamentally solve the problems of high moisture content and strong odor in sludge; the cycle of anaerobic composting is long and requires a large amount of Auxiliary raw materials, and the anaerobic composting process is difficult to control, and the process and equipment operation are difficult

[0006] In summary, the existing technology still lacks an effective solution to the problem of sludge treatment

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