Livestock and poultry breeding biogas slurry treatment and resource utilization method

Abstract

The invention discloses a livestock and poultry breeding biogas slurry treatment and resource utilization method. The method comprises the following steps: (1) adjusting the pH value of raw biogas slurry to 9-11 in a first adjusting tank, and performing standing; (2) introducing supernate obtained by standing into an ammonia stripping system, and controlling the ammonia nitrogen concentration of effluent to be below 250mg / L; (3) introducing the effluent obtained in the step (2) into an ozone oxidation system for treatment; (4) feeding the effluent treated by the ozone oxidation system into a second regulating tank, regulating the pH value to 7-9, and performing standing; (5) introducing supernate obtained after standing into a phycomycete symbiotic system; (6) introducing the effluent from the phycomycetes symbiotic system into a solid-liquid separation system to obtain a phycomycetes concentrated solution; and (7) introducing the tail water treated by the solid-liquid separation system into an ecological filter, and directly discharging after the effluent passing through the ecological filter reaches the standard. The biogas slurry is treated and recycled by adopting a combined process of ammonia stripping, ozone oxidation, phycomycete symbiotic treatment and ecological filter tank treatment, and the method has the advantages of high removal rate of carbon, nitrogen and phosphorus and the like.

Description

Technical field: [0001] The invention relates to the technical field of sewage treatment methods, in particular to a method for the treatment and resource utilization of livestock and poultry breeding biogas slurry. Background technique: [0002] In recent years, with the rapid development of the livestock and poultry breeding industry, the discharge of livestock and poultry waste has also increased rapidly, and the pollution load is high, which has become the main source of agricultural non-point source pollution, seriously restricting the further development of my country's breeding industry. In order to resolve the contradiction between the development of livestock and poultry breeding and the ecological environment, the state encourages and supports livestock and poultry farms to produce biogas through biogas projects and other methods to comprehensively utilize livestock and poultry breeding waste. With the development of biogas projects, the amount of biogas slurry pro...

AI Technical Summary

Problems solved by technology

However, the high concentration of ammonia nitrogen and organic matter in the biogas slurry has a strong inhibitory effect on the growth of microalgae, so many researchers need to dilute the biogas slurry before using microalgae for pretreatment, although this method is conducive to the growth of microalgae And effectively remove nitrogen and phosphorus, but cannot effectively remove COD, and dilution will also lead to increased treatment capacity and reaction volume, resulting in waste of water resources and uneconomical

In addition, microalgae will release extracellular organic matter to the outside world during the growth process, so simply using microalgae to treat biogas slurry will easily lead to COD not only not being effectively removed but also likely to increase, failing to meet the requirements of carbon, nitrogen, and phosphorus. sync removal

The algae-bacteria symbiosis system has the characteristics of simultaneous removal of carbon, nitrogen, and phosphorus, and the symbiotic bacteria can decompose the extracellular organic matter released by the microalgae. COD cannot be effectively removed by the symbiotic system of algae and bacteria

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