Sludge treatment method for biological treatment of wastewater

Abstract

The invention discloses a sludge treatment method for the biological treatment of wastewater and in particular relates to the field of sludge treatment. The sludge treatment method specifically comprises the following steps: I, sludge-water separation; II, sand separation; III, fermentation; IV, performing mixing; V, dehydration and compacting; VI, drying and hardening; and VII, crushing and use.Through the step of stone separation, influence of sundries or rubbles in sludge upon the appearance of mud cakes prepared later can be ensured, the completeness of the appearance of molded mud cakescan be ensured, and deficiency of compactness of the mud cakes, which is caused by mixing of hard impurities and can affect molding or transportation of the mud cakes later, can be avoided; and through the step of mixing, quick lime can be reacted with water reaction and can be also reacted with a hydrogen sulfide gas, fetid odor in the sludge can be removed, the mud cakes mixed with the quick lime are good in overall performance after being hardened, chippings are not easily generated, and convenience can be brought to storage and transportation.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, and more specifically, the invention relates to a sludge treatment method for biological wastewater treatment. Background technique [0002] Wastewater biochemical treatment is a wastewater treatment method that converts organic pollutants in solution, colloid, and finely suspended state in wastewater into stable and harmless substances through the metabolism of microorganisms. According to the different microorganisms, biological treatment can be divided into two types: aerobic biological treatment and anaerobic biological treatment. The aerobic biological treatment method is widely used in the biological treatment of wastewater. According to the tradition, the aerobic biological treatment method is divided into two types: activated sludge method and biofilm method. Activated sludge process itself is a treatment unit, it has a variety of operating modes. The treatment equipment belong...

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Problems solved by technology

[0003] For the management and operators in the waste water treatment process, the sludge treatment problem in the waste water is a very troublesome problem, although there are the following ways in the prior art: one is landfill; the other is fertilizer, in In the case of complying with the agricultural limit of sludge stipulated by the state, it is necessary to dehydrate and dry the sludge, add certain nutrients, and package it for sale; the third is used for incineration mixed with coal in power plants; the fourth is used for sea reclamation; due to landfill needs A large amount of mechanical transportation, landfill, and because it is not easy to be dehydrated, compacted, and cannot produce economic benefits, this method is not widely popularized; power plant coal-mixed incineration is a relatively environmentally friendly treatment method, but the disadvantage is that it is not cost-effective; pollution Mud reclamation is likely to cause secondary pollution of seawater, so it is not advocated

[0004] Sludge fertilizer is a common method of sludge treatment, but there are still many disadvantages, such as hydrogen sulfide and other odorous gases will be produced during the sludge digestion process, polluting the air environment of the processing site, and the sludge still has a foul smell after digestion , it is inconvenient to store; and the digested sludge has poor integrity and insufficient hardness after pressing the mud cake, which often occurs in the transportation process when the mud cake is broken or the shape of the mud cake is different, which is very unfavorable for the mud cake storage or transport

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