Experimental Study Of High And Low Concentration Dairy Wastewater By Anaerobic And Aerobic

At present, the physical chemical processing, absolute aerobic processing and anaerobic- aerobic processing are used to most of dairy wastewater treatment in China, but the design parameters were adopted results of experiment and operation in other similar wastewater treatment. By analysis in water quality of dairy wastewater, basic on the characteristic of high and low concentration, respectively adopt on different treatment process. The low concentration dairy wastewater was treated by hydrolyze-acidification and aerobic processing; he high concentration dairy wastewater was treated by hydrolyze-UASB-SBR processing; and the hybrid biologic reactor and tradition anaerobic, aerobic processing was compared, for the optimization of treatment effect.The results of experiment were shown as follow:1 At contrastive experiment of hybrid and common in treatment of low concentration dairy wastewater, the hybrid hydrolyze- acidification has more effective in removal of CODcr than common hydrolyze- acidification, and can complete the process of hydrolyze- acidification in shorter remainder time, make the VFA reach the max. At the same raw water quality, the hybrid can increase treatment efficiency about 15% than common. The hybrid biologic reactor has heightened the removal of CODcr, controlled the sludge expand, it can increase treatment efficiency about 30%, and has more effect in removal of TN and NH4-N, it can increase removal of TN about 5～30%. The low concentration dairy wastewater was treatment by hybrid hydrolyze- acidification and hybrid biologic reactor, the effluent was conform to the Second Grade of the National Standard for Wastewater Discharge (GB 8978-1996).2 In the treatment of high concentration dairy wastewater with hydrolyze-UASB-SBR, the relation of OLR and CODcr removal, VFA and pH, alkalinity and NH4-N have been investigated, the product, settlement and active of granule sludge have been analyzed; In SBR, the corresponding relation of CODcr removal and DO, NH4-N have been described, the result indicated that SBR has more removal efficiency about CODcr, confirm the optimal reaction time and degradation velocity constant in SBR.The result show that: In the treatment of low concentration dairy wastewater with hybrid biologic reactor, the removal efficiency can be enhanced about 30%, and can reduce the concentration of contamination .The craftwork of hydrolyze-UASB-SBR for high concentration dairy wastewater is feasible; the effluent was conform to the First Grade of the National Standard for Wastewater Discharge (GB 8978-1996). And the craftwork is more adaptability for other high concentration organic wastewater; it has the good effect for removal of COD_cr, BOD₅ and SS and provided the reference for similar wastewater.