Comprehensive treatment method for wastewater from production of water-soluble fertilizer from poultry manure fermentation liquid

Abstract

The invention belongs to the field of wastewater treatment, and provides a comprehensive treatment method of wastewater generated in production of water-soluble fertilizer from bird guano fermentation liquor. The method comprises the steps as follows: firstly, blowing air into wastewater produced during the preparation of water-soluble fertilizer from bird guano fermentation liquor, removing ammonia nitrogen gas in an air stripping mode; secondly, absorbing the removed ammonia nitrogen gas through a sulfuric acid solution; thirdly, adjusting the pH value of the wastewater subjected to air stripping; fourthly, inoculating the wastewater with adjusted pH value with chlorella at the logarithmic phase, feeding CO2 and air mixed gas into the wastewater, and culturing microalgae. The comprehensive treatment method can not only realize wastewater up-to-standard discharge, but also recycle ammonia nitrogen and produce biomass material, and has double effects of environment protection and resource production. The air blowing and microalgae culture system can simultaneously realize air stripping of ammonia nitrogen and wastewater culture of microalgae, respectively combines four reactors which can be separated independently into two reactors, reduces the occupied area, and saves the economic cost.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a waste water treatment method and equipment using microorganisms. Background technique [0002] Poultry manure fermentation liquid wastewater is the residue after anaerobic fermentation of poultry manure, rich in nutrients, not only contains nitrogen, phosphorus, potassium and other macro elements, but also contains a variety of trace elements, hydrolytic enzymes, amino acids, organic acids, auxin and other biological active substance. All these prove that the fermented liquid of poultry manure can be used as an excellent fertilizer. Although the concentration of nutrients in the fermented liquid of poultry manure is low, the content is greatly increased after membrane concentration treatment. At present, it has become a trend to use membrane concentration to produce water-soluble fertilizer. However, in the process of using membrane concentration to produce wa...

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Problems solved by technology

Among them, the struvite precipitation method and the coagulation precipitation method consume a large amount of chemical reagents, which are likely to cause secondary pollution to the environment. The electrochemical chlorination breakpoint method has high investment costs and is easy to form carcinogens such as chloramine. Biochemical methods Nitrification and denitrification processes tolerate low initial organic pollutant loads and take longer to run

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