Efficient anaerobic sludge backflow wastewater treatment system, process and application

Abstract

The invention relates to the technical field of sewage treatment, in particular to an efficient anaerobic sludge backflow wastewater treatment system, process and application, which comprises a grating tank, a primary sedimentation tank, a hydrolysis acidification tank, an anaerobic IC reactor and a sludge backflow system. The grid tank is connected with the primary sedimentation tank through the adjusting pre-aeration tank, the primary sedimentation tank is connected with the intermediate sedimentation tank through the hydrolysis acidification tank, the intermediate sedimentation tank is connected with the efficient sedimentation tower through the anaerobic IC reactor, and the sludge backflow system comprises a first backflow pipe, a second backflow pipe and a third backflow pipe. The hydrolysis acidification pool and the middle sedimentation pool enhance the pollutant removal capacity of the hydrolysis acidification pool, the sludge backflow system enables sludge of the middle sedimentation pool, flocculent sludge of the efficient sedimentation tower and granular sludge to flow back to the hydrolysis acidification pool and the anaerobic IC reactor respectively, and the pollutant removal capacity of the hydrolysis acidification pool is improved; propagation of granular sludge in the anaerobic IC reactor is guaranteed, the effect of activated sludge is exerted, the problem of sludge leakage of an anaerobic system is effectively solved, and powerful guarantee is provided for process operation.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a waste water treatment system, process and application of high-efficiency anaerobic sludge return. Background technique [0002] In the prior art, the anaerobic treatment technology is a commonly used process in the sewage treatment process, mainly based on the existing up-flow anaerobic sludge bed reaction technology and internal circulation anaerobic reaction technology. figure 2 shown: [0003] The industrial wastewater enters the wastewater collection tank, and after collection, it is sent to the primary sedimentation tank for precipitation. The sludge material with a larger specific gravity settles to the bottom of the tank and enters the sludge thickening tank to be recovered. The upper wastewater after removing the sludge flows out and enters the pre-acidification. Pool treatment, because the acidification effect of the pre-acidification pool is relatively low, ...

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Problems solved by technology

[0004] This traditional process mainly has the following deficiencies in the actual operation process: ①. The process does not completely remove the sediment, large particle pollutants, and water-insoluble organic matter in the wastewater, which has a great impact on the subsequent system operation, resulting in subsequent Anaerobic system does not work as expected

②. Since the anaerobic reactor has high requirements on the concentration of suspended solids in the influent, the concentration of suspended solids in the anaerobic influent must be less than 500mg / L to ensure the normal operation of the anaerobic reactor, while the traditional acidification tank does not have sedimentation separation function, these substances cannot be separated by gravity sedimentation

③. When the content of soluble lignin, sugar and fine suspended matter in the wastewater is high, the removal rate of such substances in the pre-acidification tank is very low. In the case of incomplete acidification, large molecules cannot be hydrolyzed into small molecule pollution will affect the subsequent operation of the anaerobic system

④. The existing design is unreasonable and the parameters are not perfect. The phenomenon of sludge running out of the IC anaerobic reactor is relatively common during operation, and the sludge grows slowly, resulting in serious loss of anaerobic granular sludge. The efficiency of the entire wastewater treatment system is low, and the treatment capacity cannot Meet the needs of industrial production

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