Surplus biochemical sludge reduction treatment system and treatment method

Abstract

The invention relates to the application field of solid waste reduction and resource utilization, and discloses a residual biochemical sludge reduction treatment system and a treatment method, wherein the treatment system includes: a feeding system, a reaction system and a separation system, and the The reaction system includes: a reactor and a pressure reducer; the reactor includes: a pressure reducing device, a partition plate and an internal mixer which are sequentially arranged from bottom to top along its height direction, and the partition plate divides the reactor into two upper and lower parts The reaction zone, the internal mixer communicates with the lower reaction zone of the reactor through the partition plate, and the internal mixer is also provided with a reaction product outlet communicated with the upper reaction zone of the reactor; the reactor is also provided with an external circulation device. Using the treatment system of the present invention to perform hydrothermal treatment on the surplus activated sludge can effectively remove the organic matter in the sludge, obtain the surplus sludge with greatly reduced water content, and realize the reduction of sludge discharge.

Description

technical field [0001] The invention relates to solid waste reduction and resource utilization, and more specifically, to a residual biochemical sludge reduction treatment system and treatment method. Background technique [0002] In recent years, my country's environmental protection industry has developed rapidly, and the sewage treatment capacity and treatment rate have increased rapidly. As of the end of September 2016, a total of 3,976 sewage treatment plants have been built nationwide, with a daily sewage treatment capacity of 170 million cubic meters. It plays a big role. But at the same time, the sewage treatment process produces a large amount of excess activated sludge. Based on the amount of excess activated sludge produced by the current sewage treatment, 1.3 million cubic meters of excess activated sludge with a water content of 98% by weight will be produced every day, with an annual output of excess activated sludge. Sludge will reach 475 million cubic meters,...

AI Technical Summary

Problems solved by technology

These technologies have a certain effect on the reduction of excess activated sludge, but they all have obvious shortcomings. For example, the dry landfill technology not only occupies a large amount of land, but also has the risk of polluting groundwater, and the composting technology will cause heavy metals in the soil during use. Pollution and biological pollution, incineration technology not only requires high equipment and high processing costs, but also produces harmful gases that pollute the atmosphere

[0004] For example, CN105859088A discloses a supercritical sludge treatment system and method, which makes the sludge slurry undergo a combustion reaction in the reactor of the supercritical sludge treatment device by adding oxidant and carbon-containing organic powder, but the reaction conditions are very harsh

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