Study On Treating Livestock And Poultry Breeding Wasterwater By Aerobic-ecological Tank Technique

Livestock and Poultry Breeding anaerobic digestion wastewate（biogas slurry） is the result of anaerobic fermentation of the residual liquid, The main components are produced during the fermentation of soluble substances, Rich in nutrients and mi^cronutrients, Also rich in amino acids, B vitamins, Various hydrolytic enzymes, Certain plant hormones as well as inhibit pests such substances or factors. The wastewater through anaerobic digestion, However, the COD^cr biogas slurry can reach 600²000mg/L, Ammonia 600¹200mg/L, TN1000～1800mg/L, Turbidity 150³00NTU and Conductivity> 6000μS/cm, Still a high concentration organic wastewater. In order to protect the environment, Improvement of ecological environment and sustainable development strategies, The need for post processing of the slurry.For this thesis, technology and efficient R & D eco-aerobic combined treatment with biogas slurry tank technology. First of all, to improve aerobic process, for The new technology to reach the water after treatment with biogas slurry”Discharge Standard of Pollutants for Livestock and Poultry Breeding”（GB1859622001）. And then this water tank for efficient handling of ecological, The treated effluent meeting to“Integrated Wastewater Discharge Standard”（GB8978-1996） secondary standards.Study concluded:（1） Based on the moving bed biofilm reactor （MBBR） technology, To reduce the amount of suspended packing, for the focus on Reducing energy consumption, combined integration Aerobic moving bed and fixed bed biofilm reactor, R & D Mobile - Fixed integration aerobic biofilm reactor （MFBBR）, and dexamine the technical performance of the process. Biogas slurry with MFBBR Process, When the water of COD^cr and NH₃-N concentrations in 1150mg/L and 500mg/L, HRT in the range of 6 ²4h, the COD^cr and NH₃-N effluent concentrations were 342mg/L and 70mg/L,Achieve "Emission Standards for Livestock and Poultry Breeding Industry"（GB18596-2001）.（2）Study slurry processing technology eco-tank through the four elements of the system（such as Plants, packing, shellfish and fish）, And the use of orthogonal to construction of ecological treatment system unit slot and biomass of species, Based on the above design on the slurry tank and run eco-debug. Through the study found: System affect the treatment effect of biogas slurry is the most important factor in plant, Followed by packing, Then followed by fish and shellfish. When the concentration of slurry liquid water: pool stream = 1: （2 to 4）, Flow rate of 14L/h 23L/h, Single tank capacity of 0.7t 0.8t;Oxygen tank and water hyacinth plant （coverage of 70% to 80%）, Aerobic tank and fill additional aeration equipment （packing density of 1.5m²/t）, And Raise mussels （put amount 3.0kg/t 3.4kg/t）), Fish tank stocking eating algae and fish （tilapia, stocking density was 14tail/t 16 tail/t）, Clarify the nature of gravity sedimentation tank or add flocculant precipitate, Purification period of 6 days to 8 days, Through the system of processing effluent water to achieve "Integrated Wastewater Discharge Standard" （GB8978-1996） secondary standards.（3）Aerobic-Ecological Tank Technique based on the united R & D through to the MFBBR and Ecological Tank Technology. Use Aerobic-Ecological Tank Technique process to deal with biogas slurry, Known by experiment:System start-up time is 12 days, effective water and stable,System C:N relatively modest in the 6.5-8.1 range, COD^cr stable effluent quality in 75mg/L-120 mg / L, Ammonia at 9.95mg/L-17.32mg/L, Water line "Integrated Wastewater Discharge Standard" （GB8978-1996） a standard.