Method for producing feed additive from livestock and poultry breeding wastewater and purifying breeding wastewater to reclaimed water

Abstract

The invention relates to the fields of environmental technology and the breeding and processing of microalgae, in particular to a method for producing feed additive from livestock and poultry breeding wastewater and purifying breeding wastewater to reclaimed water. The method is characterized by comprising the following steps that: wastewater enters an acidification adjusting tank through a grille, and the acidified wastewater enters an anaerobic biochemical reactor for treatment and then enters an aerobic biochemical reactor; after the aerobic biochemical treatment, the obtained biogas slurry enters a settling tank for settling, the supernatant enters a membrane bioreactor for further aerobic treatment and is filtered by an ultrafiltration membrane, the generated ultrafiltration clear liquid is sterilized and neutralized and then enters a photobioreactor, algae are added into the photobioreactor to perform microalgae cultivation, and the algae liquid is discharged from the photobioreactor and then enters a flocculation and settling tank; and after flocculation and settling, the supernatant is used for water recycling, the concentrated algae liquid at the bottom enters a filter, and the separated microalgae slurry enters a fermentation / enzymolysis pot (tank) to perform fermentation / enzymolysis to be used as the feed additive. The invention has the advantages of high economic adaptability, zero discharge and the like.

Description

[technical field] [0001] The invention relates to the fields of environmental protection technology, microalgae breeding and processing, and in particular relates to a method for producing feed additives and purifying wastewater from livestock and poultry breeding into reclaimed water. [Background technique] [0002] Eutrophication refers to the phenomenon of water pollution caused by excessive plant nutrients such as nitrogen and phosphorus. Eutrophication restricts the sustainable economic and social development of lake basins, and has become one of the most serious ecological and environmental problems in the world. The discharge of livestock and poultry manure and flushing sewage is one of the main causes of eutrophication in water bodies. According to statistics, the chemical oxygen demand (COD) discharge of livestock and poultry manure reached 12.683 million tons in 2007, accounting for 41.9% of the total COD discharge in the country. Most of the large amount of wast...

AI Technical Summary

Problems solved by technology

However, most of the heavy metals in high-dose heavy metal feed additives will be excreted with the excrement of livestock and poultry, for example, 90% of copper and 90% to 95% of zinc entering the livestock and poultry body will be excreted from the feces, directly causing livestock and poultry manure and farms The heavy metal content in sewage seriously exceeds the standard

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