Method for treating livestock farm wastewater through biological flocculation-electrodialysis and application of method
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A technology of biological flocculation and electrodialysis, applied in biological water/sewage treatment, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve problems such as secondary pollution of the atmospheric environment, achieve good flocculation effect, and promote solidification The effect of liquid separation
Pending Publication Date: 2022-04-22
NANJING AGRICULTURAL UNIVERSITY
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[0008] CH 4 , CO 2 Greenhouse gas, causing secondary pollution of the atmospheric environment, etc., provides a method of bioflocculation-electrodialysis treatment of farm wastewater and its application, including bioflocculation treatment process and electrodialysis treatment process, the method first propagates and cultivates The specific microbial bacterial liquid is used as a bioflocculation agent to perform bioflocculation treatment on wastewater. Through the combined effects of adsorption bridging, electrical neutralization, and net capture, the SS in wastewater is quickly gathered together and turned into large particle agglomerations. At the same time, COD, TP, etc. in the wastewater are reduced. After deep solid-liquid separation, the COD, TP, and other substances in the original wastewater are recycled into the solid residue, and the obtained clear wastewater is treated by electrodialysis treatment process to further efficiently recover Nitrogen, potassium and other substances are added to the concentrated water, and finally the fresh water discharged by electrodialysis reaches the standard. This method not only has the advantages of efficient nutrient recovery, carbon reduction and pollution reduction, but also can avoid the generation of CH in the existing water treatment process. 4 , CO 2 The problem of secondary pollution of the atmospheric environment caused by greenhouse gases
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Embodiment 1
[0067] This embodiment provides an application of a bioflocculation-electrodialysis method for treating farm wastewater in the treatment of thick slurry wastewater from pig farms.
[0068] The concentration of each pollutant in the concentrated slurry wastewater produced by primary solid-liquid separation after the collection of pig farm manure is as follows: COD5756mg / L, SS 6623mg / L, total nitrogen 551mg / L, ammonia nitrogen 477mg / L, TP 236mg / L, K+ 308 mg / L, pH 8.21.
[0069] The application process flow chart is as follows figure 1 As shown, the infrastructure includes a bioflocculation system and an electrodialysis system. The bioflocculation system includes a microbial culture tank, a flocculation tank, a plate and frame filter press and a water collection tank; the electrodialysis system includes a complete set of electrodialysis equipment, as follows:
[0070] Preparation of microbial bacterial liquid:
[0071] In 2 8m each with adjustable speed mixer and aeration and o...
Embodiment 2
[0083] This embodiment provides an application of a bioflocculation-electrodialysis method for treating farm wastewater in the treatment of thick slurry wastewater from dairy farms.
[0084] The concentrations of pollutants in the concentrated slurry wastewater produced by primary solid-liquid separation after the collection of dairy farm manure are as follows: COD21252mg / L, SS 10347mg / L, total nitrogen 2298mg / L, ammonia nitrogen 1699mg / L, TP 322mg / L, K + 401mg / L, pH8.25. The application process flow chart is as follows figure 1 As shown, the infrastructure includes a bioflocculation system and an electrodialysis system. The bioflocculation system includes a microbial culture tank, a flocculation tank, a plate and frame filter press and a water collection tank; the electrodialysis system includes a complete set of electrodialysis equipment, as follows:
[0085] Preparation of microbial bacterial liquid:
[0086] In 2 10m each with adjustable speed mixer and aeration and oxy...
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Abstract
The invention discloses a method for treating livestock farm wastewater through biological flocculation-electrodialysis and application of the method, and belongs to the field of wastewater treatment. The method comprises biological flocculation treatment and electrodialysis treatment, specifically, firstly, livestock and poultry breeding wastewater is used as a culture medium, bacterial liquid of specific thiobacillus ferrooxidans and aspergillus niger which are subjected to propagation culture is used as a biological flocculation bacterial agent, the wastewater is subjected to biological flocculation treatment, and through the combined action of adsorption bridging, electric neutralization, net capturing and the like, the wastewater is subjected to electrodialysis treatment. SS in the wastewater is rapidly gathered together to become large-particle aggregates, COD, TP and the like in the wastewater are reduced, after deep solid-liquid separation, COD, TP and other substances in the original wastewater are recycled into solid residues, the obtained clear wastewater is treated through an electrodialysis treatment process, nitrogen, potassium and other substances are further efficiently recycled into concentrated water, finally, fresh water reaches the standard, and the wastewater is recycled. The method not only has the advantages of efficiently recovering nutrients and reducing carbon and pollution, but also can avoid the problem of secondary pollution to the atmospheric environment caused by greenhouse gases such as CH4 and CO2 generated in the existing water treatment process.
Description
technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a biological flocculation-electrodialysis method for treating farm wastewater and its application. Background technique [0002] Pig farms and cattle farms are the most typical farms, which produce large amounts of wastewater and are difficult to treat. During the breeding process of pigs, cattle and other livestock animals, the feces formed by drinking drip water, housing flushing water, excrement, etc. are transported to the manure collection tank through the sewage ditch. After the primary solid-liquid separation, the separated solid manure can be As a raw material for the preparation of organic fertilizers, it also produces a thick slurry of suspended particles (SS), carbon-containing pollutants (chemical oxygen demand, COD) and plant nutrients such as nitrogen, phosphorus, and potassium that are difficult to settle naturally. waste water. The thick slurry wa...
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