Method for processing domestic sewage through diatomite biological system

Abstract

The invention relates to a method for processing domestic sewage through a diatomite biological system. The method for processing the domestic sewage through the diatomite biological system comprises the steps that primary treatment is conducted on the domestic sewage, the domestic sewage is led into an anoxic pool of a biological reaction pool after primary treatment, the domestic sewage enters an aerobiotic pool after being processed, and the domestic sewage is processed in the aerobiotic pool; inner back flow is conducted in the aerobiotic pool and in the anoxic pool, the sewage coming out of the aerobiotic pool passes through a feeding chamber and a water collection chamber, addition and mixture of diatomite are conducted on the sewage, the sewage enters an efficient diatomite reactor through a pressure pump, sludge-water separation is conducted on the sewage, clear water separated from the efficient diatomite reactor enters a contact pool, the clear water is sterilized and then discharged, part of the clear water flows back to an anoxic zone of the biological reaction pool and then enters an aerobiotic zone, the reflux ratio is 0-100%, remaining sludge passes through a sludge storage pool, sludge dewatering and filter pressing are conducted on the remaining sludge, and the sludge is conveyed out in a sludge cake mode. The method for processing the domestic sewage through the diatomite biological system is small in technological cost, good in quality of the discharged water, free of odors, capable of enabling the remaining sludge to be used repeatedly, and free of secondary pollution.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for treating domestic sewage by using diatom concentrate biological system. Background technique [0002] During the "Twelfth Five-Year Plan" period, the country put forward new requirements for the discharge of urban sewage, and the discharge standard was raised from the GB18918-2002 Grade B standard to the GB18918-2002 Grade A standard. There are also new requirements for disposal, and it has risen to the stage of strict legal control. Therefore, we must develop a set of new technologies and new processes that can save resources to treat sewage and solve the current problems in sewage treatment. [0003] At present, domestic and foreign methods of sewage treatment mainly include: chemical coagulation method, that is, the simple process of grid->sand settling->flocculation->sedimentation->water discharge. The advantages are small investment, le...

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Problems solved by technology

[0004] The existing patented technology ZL200810022599.3 mainly solves the removal of phosphorus and nitrogen in sewage, but the above two methods cannot recover all the pollutants at one time, let alone the reuse of sludge, and the seriousness of various processes Disadvantages, sludge will also cause secondary pollution

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