Biogas slurry efficient solid-liquid separation treatment method for inducing protein salting-out precipitation

Abstract

The invention relates to an efficient biogas slurry solid-liquid separation treatment method for inducing protein salting-out precipitation, which comprises the following steps: firstly, mixing biogas slurry with an acid solution to obtain acid treated biogas slurry; adding a salting-out agent into the acid-treated biogas slurry, and stirring and mixing to obtain salting-out treated biogas slurry; and finally, centrifugally treating the salting-out treated biogas slurry to obtain supernate containing the salting-out agent and biogas residues. Compared with the prior art, the method has the advantages that cells in the biogas slurry are cracked by the strong acid, proton binding sites of proteins are neutralized, and the salting-out agent is added to capture hydrated layers of acidified proteins to aggregate and precipitate, so that the solid-liquid separation performance of the biogas slurry is improved, the moisture content of obtained biogas residue mud cakes is lower than 60%, the SS (suspended solids) of effluent is lower than 2000mg / L, and the pH value of the biogas residue mud cakes is higher than 7. The moisture content of the biogas residues is efficiently reduced, and the water treatment amount of effluent is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to a biogas slurry high-efficiency solid-liquid separation treatment method for inducing protein salting out and precipitation. Background technique [0002] With the improvement of people's living standards and the vigorous promotion of the national waste resource policy, the huge amount of organic kitchen waste in daily life has been collected separately. The characteristics of easy corruption and high water content make it impossible to be directly landfilled or incinerated. . Therefore, the treatment of organic food waste poses a serious challenge to the prevention and control of environmental pollution and the sustainable utilization of social resources in my country, and fermentation technology can achieve the degradation of perishable substances and the reduction of high water content substances. [0003] After anaerobic digestion of organic food waste, anaerobic micro...

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Problems solved by technology

Furthermore, incineration has gradually become the development direction of solid waste final disposal in my country due to its significant benefits of reduction, stabilization, and energy conversion, but the addition of polyaluminum chloride (PAC) A large amount of chloride ions were introduced into the mud, which aggravated the risk of dioxin formation in the biogas residue incineration process, Fe 3+ The introduction of biogas slurry treatment equipment will cause corrosion. The above defects seriously limit the sustainable application of traditional mixing / flocculation conditioners in biogas slurry solid-liquid separation + incineration process

In addition, for the biogas slurry solid-liquid separation process, quicklime is widely used as a coagulation conditioning agent, but the dosage usually reaches 10-15wt.% of the wet weight of the sludge, and the dosage is high, the capacity increase ratio is large, Adjusting the pH value of biogas slurry to alkaline constitutes the main factor that traditional coagulation conditioners restrict the subsequent resource utilization and treatment efficiency of biogas slurry

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