Method and system for treatment and recycling of feces and waste from livestock and poultry culture

Abstract

The invention provides a method and a system for treatment and recycling of feces and waste from livestock and poultry culture. The system comprises a waste water organic matter accumulating system, an anaerobic fermentation system, a sludge return system and a waste water recycling system. The method comprises the following steps: based on the characteristic that active sludge can highly absorb organic matters in waste water, accumulating the organic matters in the waste water from livestock and poultry culture; generating methane by anaerobic fermentation of sludge enriched with high-concentration organic matters together with dried feces so as to realize the recycling of biomass energy; and further treating low-concentration waste water after enrichment of organic matters by using constructed wetland and a sterilization method to meet water quality standards and to realize zero discharge of waste water. In addition, part of sludge in a sedimentation tank and biogas residues generated by anaerobic fermentation are returned and aerated in a regeneration tank to recover the high absorption activity so as to circularly absorb the organic matters in the waste water, thereby realizing recycling of the sludge and the biogas residues. The method and the system realize the treatment and recycling of feces and waste from livestock and poultry culture as well as recycling of biomass in the waste water and zero discharge of the waste water, and have the advantages of simple structure, low investment and operation cost, high treatment efficiency and the like.

Description

technical field [0001] The invention designs a livestock and poultry breeding manure conversion energy and recycling method and system, belonging to the field of sewage treatment. technical background [0002] At present, the number and scale of large-scale pig farms are increasing year by year. The existing manure treatment processes include: anaerobic-aerobic-oxidative pond process, hydrolysis-SBR process, internal circulation anaerobic reactor (IC process), Combined stable pond. Among them, the hydrolysis-SBR process is to purify the sewage through the two-step procedure of the hydrolysis reactor and the SBR reactor to degrade the concentration of organic matter. This process has a good removal effect on organic pollutants in the hydrolysis effluent, but there are still residual A considerable amount of refractory COD is beyond the reach of biochemical treatment, and physical and chemical treatment must be carried out. The hydraulic retention time of the hydrolysis ...

AI Technical Summary

Problems solved by technology

Using IC reactor to treat pig farm wastewater, its efficiency has been greatly improved, but it is difficult to increase the volume load of pig farm wastewater treated by IC, and the hydraulic retention time is long. At the same time, the removal rate of SS by IC is slightly poor, and the removal rate is 78.15%, mainly due to the increase in load Afterwards, due to sludge loss

The combined stabilization pond is a new type of anaerobic-facultative combined method, which mainly uses the aerobic treatment process. The overall engineering investment of this process is small, the management is convenient, and the operating cost is low, but the process is greatly affected by the climate. , and occupies a large area, and the processing cycle is long

[0003] In view of the above research, we propose a sludge adsorption anaerobic fermentation technology based on sludge adsorption that can solve the problems of long hydraulic retention time and low biodegradability, realize zero discharge of sewage reuse, simple process, and convenient operation. Farm sewage conversion and reuse system

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