Method for treating sludge of urban sewage treatment plants in controllable composting mode

Abstract

The invention relates to a method for treating sludge of urban sewage treatment plants, in particular to the method for treating the sludge of the urban sewage treatment plants in a controllable composting mode. The method is characterized by comprising the following steps of: a, preparing organic fertilizer auxiliary materials; b, placing the sludge into a conventional stirring machine at the normal temperature, mixing the sludge and the organic fertilizer auxiliary materials to obtain a mixture, and fully stirring the mixture to form high-temperature compost; c, placing the high-temperature compost in ventilated and rain sheltering environment for high-temperature composting, regulating and controlling the internal temperature of the high-temperature compost by using an air blower during the process of the high-temperature composting, controlling the internal temperature to quickly rise and keeping the temperature about 75 DEG C to perform rapid fermentation on organic matters, and keeping for 15 to 20 days to form organic fertilizer primary products; and d, screening the decomposed and dehydrated organic fertilizer primary products, stabilizing the organic fertilizer at the normal temperature for 10 to 15 days to form organic fertilizer finished products, and finally bagging the organic fertilizer finished products to obtain the fertilizer products.

Description

technical field [0001] The invention relates to a method for treating sludge in urban sewage treatment plants, in particular to a method for treating sludge in urban sewage treatment plants in a controllable composting manner. Background technique [0002] With the advancement of science and technology and the improvement of people's requirements for environmental protection, the sewage generated in people's lives needs to be treated before being discharged into the natural environment. The existing sewage treatment is carried out through the sewage treatment plant (station) for activated sludge method and biofilm method. Sediment or filter the sewage to remove impurities and sludge, and then discharge the water that meets the environmental protection requirements to the natural environment. It is the process of purifying sewage to meet the water quality requirements of a certain water body for drainage or reuse. During the sewage treatment process, the sewage treatment pla...

AI Technical Summary

Problems solved by technology

Another problem with the landfill method is that since most of the landfills are open air, the sludge that returns to its original shape after a few rains poses a serious hazard to the safety of the site.

Not only does the sludge spread everywhere, but the corrosion and penetration of the sludge to the protective facilities of the landfill is also very serious, and the life of many landfills is greatly shortened

And toxic and harmful substances may seep into the ground, polluting groundwater and the surrounding ecological environment

Sludge landfill is also limited by land use, and the cost of sludge transportation is also high

2. The existing sludge is used as organic fertilizer (land utilization). Although it contains some organic matter, the heavy metals, pathogenic bacteria and other long-lasting organic pollutants contained in it will cause harm to the soil and seriously affect the quality of crops; The sludge produced in the sewage treatment process has a high content of organic matter and is not stable, easy to rot, and contains parasite eggs. If it is not treated properly, it will cause secondary pollution, so it must be properly disposed of

The random application of sludge fertilizer in some places has caused problems such as land salt damage, burning seedlings, pests and diseases, etc.

3. The sludge used for incineration consumes a lot of energy, and the equipment is complex, energy-consuming, high-investment, and can produce toxic and harmful gases such as dioxin

[0005] However, the above-mentioned existing sludge composting methods are all extensive, that is, the process of sludge decomposing at high temperature completely depends on the temperature generated by the natural decomposition of the bacteria in the sludge, and the temperature is random. In the stacking (stacking) step, use this to adjust the internal temperature of the stack. The stack turning machine used consumes a lot of energy and is inefficient, and it is not easy to keep the temperature of the high-temperature compost constant

Correspondingly, the time and quality of sludge conversion into organic fertilizer cannot be controlled, so that the sludge treatment process cannot be effectively controlled, and a large amount of sludge cannot be treated.

The above disadvantages are technical problems that have been difficult to solve for a long time in the existing sludge composting treatment methods