A kind of treatment method of livestock and poultry breeding wastewater anaerobic fermentation liquid

Abstract

The invention discloses a treatment method of anaerobic fermentation liquid of livestock and poultry breeding wastewater. Based on the novel nitrogen and phosphorus removal theoretical technology, a cyclic autotrophic nitrogen removal coupled denitrifying phosphorus removal process, aiming at reducing the cost and realizing deep nitrogen and phosphorus removal, is developed. The treatment method comprises the following specific steps: firstly feeding raw livestock and poultry breeding wastewater into a denitrifying phosphorus removal SBR reactor, and removing COD and thoroughly releasing phosphorus by use of an anaerobic reaction; feeding the high-concentration phosphorus-containing anaerobic effluent into an MAP reaction tank for phosphate crystallization recovery; continuously feeding the wastewater anaerobic fermentation liquid and the MAP settling tank effluent into a semi-short range denitrifying reactor for decarburization and partial ammoniacal nitrogen transformation; feeding the effluent of the semi-short range denitrifying reactor into an anaerobic ammonia oxidation reactor for nitrogen removal; feeding the effluent of the anaerobic ammonia oxidation reactor into the denitrifying phosphorus removal SBR for deep nitrogen and phosphorus removal of the anoxic phase, and draining water and discharging mud after the reaction is terminated. The treatment method is efficient and stable in process and greatly reduced in operating cost, and has great popularization and application values.

Description

technical field [0001] The invention belongs to the field of biological wastewater treatment and relates to a method for treating livestock and poultry breeding wastewater with anaerobic fermentation liquid. Background technique [0002] Large-scale pig farms have a large amount of wastewater discharge and contain high concentrations of COD, TN (mainly NH 4 + -N form) and TP and other characteristics, if not effectively treated, it will directly threaten and harm my country's urban environment, drinking water sources, and agricultural ecology. BOD / COD in pig farm wastewater is generally between 0.4-0.7, which is easily degradable organic wastewater, so biochemical method is the preferred process for pig farm wastewater treatment. [0003] The wastewater from large-scale pig farms contains a high concentration of COD, which can be recovered by using anaerobic bio-fermentation to generate biogas. At present, biogas digesters have been popularized and applied in most pig far...

AI Technical Summary

Problems solved by technology

Although anaerobic biofermentation biogas can remove most of the COD in pig farm wastewater, the concentration of pollutants in the effluent is still high, especially NH 4 + -N and TP are basically not removed, which is a typical low-carbon-to-nitrogen ratio wastewater, and it is difficult to achieve standard discharge by using traditional nitrogen and phosphorus removal processes

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