Method for treating recycled livestock and poultry breeding wastewater by aid of forward osmosis membrane bioreactors

Abstract

The invention discloses a method for treating recycled livestock and poultry breeding wastewater by the aid of forward osmosis membrane bioreactors. The method includes steps of arranging the livestock and poultry breeding wastewater in the bioreactors and carrying out biodegradation reaction under the condition that the concentration of activated sludge is 3000-7000 mg/L; separating the sludge from water in biologically treated raw material solution by the aid of forward osmosis membrane assemblies; transforming the raw material solution into clear water under filter effects of forward osmosis membranes and osmotic pressure effects and allowing the clear water to flow into draw solution tanks. The COD (chemical oxygen demand) concentration of the livestock and poultry breeding wastewater is 1000-5000 mg/L, the content of TN (total nitrogen) in the livestock and poultry breeding wastewater is 500 mg/L, and the content of TP (total phosphorus) in the livestock and poultry breeding wastewater is 100 mg/L. The forward osmosis membrane assemblies run in such two modes that active layers face draw solution or the raw material solution. The method has the advantages that the method is high in nitrogen, phosphorus and organic matter treatment efficiency, and recycling standards can be met by outlet water; forward osmosis procedures are low in energy consumption and little in membrane pollution, and accordingly the method is high in market competitiveness in the aspect of technological running cost.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for treating reused livestock and poultry breeding wastewater by a forward osmosis membrane bioreactor. Background technique [0002] The livestock and poultry breeding industry is one of the leading agricultural industries in my country, and the pollution of livestock and poultry breeding wastewater has gradually become one of the main causes of rural pollution in my country. Livestock and poultry breeding wastewater mainly contains livestock and poultry manure and urine, and the concentration of suspended solids, organic matter, nitrogen, phosphorus and other pollutants in its components is very high, and its biochemical properties are good. At present, because the pollution problems caused by livestock and poultry farms have not attracted enough attention, the quantity and quality of feces and urine pollutants produced by them are no less than industrial pollutants. Un...

AI Technical Summary

Problems solved by technology

Untreated discharge of high-concentration organic wastewater will cause eutrophication of the water body, consume a large amount of dissolved oxygen in the water, or increase the concentration of nitrate nitrogen and nitrite nitrogen in the groundwater, causing the surrounding water body to stink. This not only seriously endangers the waters near the farm and the health of the surrounding residents, but also hinders the sustainable development of the farming industry itself.

[0003] Traditional livestock and poultry wastewater is mainly treated with anaerobic technology, but this method has high requirements on environmental factors such as temperature and pH, and a certain amount of biogas will be generated during the anaerobic process. The biogas collection system is expensive and requires high operation, which is not suitable for livestock farms use

In particular, due to the high concentration of ammonia nitrogen in livestock and poultry wastewater, it is easy to cause excessive acidification of the system in actual operation, which affects the subsequent aerobic treatment effect, and the actual treatment effect is not good.

Images