Sludge anaerobic treatment system and method

Abstract

The invention provides a sludge anaerobic treatment system and method, and relates to the field of sludge treatment.The sludge anaerobic treatment system comprises a hardening and tempering tank, a sterilization tank, an alkali washing tank, a neutralizing tank and an anaerobic fermentation tank, sludge enters the hardening and tempering tank, and the hardening and tempering tank adjusts the water content of the sludge; inlets of the sterilization tank and the alkali washing pool are connected in parallel to an outlet of the conditioning pool, and outlets of the sterilization tank and the alkali washing pool are connected in parallel to an inlet of the neutralization pool; the inlet of the anaerobic fermentation tank is connected with the outlet of the neutralization tank, the system can improve the sterilization rate of sludge to 90-100% through flow design, the biogas residue after anaerobic treatment is high in stabilization degree, good in dehydration effect and high in subsequent resource utilization rate; the COD content of the treated sludge solution is increased, the anaerobic digestion and decomposition rate is high, and the organic matter degradability is high.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge anaerobic treatment system and method. Background technique [0002] As a by-product of sewage treatment, sludge is enriched with rich pollutants, including heavy metals, refractory organic matter, parasite eggs and virus microorganisms. The national "Water Ten Measures" clearly stipulates that sludge should be treated and disposed of in a stabilized, harmless and resourceful manner, so as not to cause secondary pollution to the environment. [0003] At present, my country's main sludge stabilization treatment includes sludge drying and incineration, high-temperature aerobic fermentation technology and anaerobic digestion technology. Anaerobic digestion of sludge includes high-temperature anaerobic digestion process and medium-temperature anaerobic digestion process. Considering energy consumption and other issues, medium-temperature anaerobic digestion technology is wid...

AI Technical Summary

Problems solved by technology

The main reason is that the anaerobic digestion of sludge is faced with a series of problems such as high operating costs, low biogas yield, and difficult biogas residue treatment, which has led to the failure of many anaerobic digestion sludge plants to operate normally.

[0005] The above problems are determined by the quality of sludge in our country. Compared with the sludge treatment in developed countries, urban sludge in my country has the characteristics of low organic matter content, large sand content, and high sludge production, which limits the sludge production in my country. Stabilization Treatment and Disposal Routes

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