High-efficiency desalination treatment process of biogas slurry obtained after fermentation of cow breeding wastewater

Abstract

The invention discloses a high-efficiency desalination treatment process of biogas slurry obtained after fermentation of cow breeding wastewater. The process comprises the following steps: carrying out pretreatment, concretely filtering the biogas slurry by a grid to remove impurities, introducing the filtered biogas slurry into a sedimentation tank for sedimentation treatment, carrying out filtering after the sedimentation treatment is finished, and collecting the filtrate to obtain primary supernatant biogas slurry; carrying out flocculation and precipitation treatment, concretely adding a coagulant and a coagulant aid into the primary supernatant biogas slurry while stirring, and carrying out solid-liquid separation to obtain supernatant biogas slurry; and carrying out membrane separation treatment, concretely pumping the supernatant biogas slurry into a nanofiltration device for filtration to obtain a filter membrane dialysate, introducing the filter membrane dialysate into an electrodialyzer for desalination and concentration treatment to obtain electrodialysis desalted fresh water, and carrying out up-to-standard discharging. The process has the advantages of simple and convenient operation, wide raw material source, low energy consumption, reasonable utilization of resources, obvious economic benefits and wide application prospects.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a high-efficiency desalination treatment process for biogas slurry after fermentation of dairy cow breeding wastewater. Background technique [0002] The fermented biogas slurry from aquaculture wastewater is used for agricultural irrigation to effectively achieve the triple effects of water saving, pollution reduction, and efficiency enhancement. However, in the process of feeding dairy cows, in order to maintain the electrolyte balance of the cow body and improve feed remuneration, salt bricks need to be added. As an additive, the salt content of its breeding wastewater is higher than that of other livestock and poultry breeding wastewater. The high salt content in the breeding wastewater will bring heavy metals and salt into the soil with irrigation and accumulate year by year, resulting in the accumulation of salt on the soil surface and the reduction of land prod...

AI Technical Summary

Problems solved by technology

[0002] The fermented biogas slurry from aquaculture wastewater is used for agricultural irrigation to effectively achieve the triple effects of water saving, pollution reduction, and efficiency enhancement. However, in the process of feeding dairy cows, in order to maintain the electrolyte balance of the cow body and improve feed remuneration, salt bricks need to be added. As an additive, the salt content of its breeding wastewater is higher than that of other livestock and poultry breeding wastewater. The high salt content in the breeding wastewater will bring heavy metals and salt into the soil with irrigation and accumulate year by year, resulting in the accumulation of salt on the soil surface and the reduction of land production capacity. , causing great harm to agricultural production

Different from domestic sewage and industrial production, the standard discharge model widely used in the field of domestic sewage and industrial wastewater treatment is difficult to effectively promote and apply in the treatment of aquaculture wastewater