Application Research Of The Novel Combined Ic-sbbr Process In Treatment Of Swine Wastewater

Large-scale farming can greatly improve production efficiency and raise conversion rates, reduce costs and increase economic efficiency; with the rapid development of large-scale farming, also cause a new series of environmental problems also, especially swine wastewater contain high nitrogen and organic, the traditional method of anaerobic digestion can not have the ability of biological nitrogen removal, and often cause the low C/N ratio of the anaerobic digesting fluid and the difference of biochemistry degradation.Based on the latest research findings on swine wastewater biological treatment in both domestic and abroad, the article proposed that adopt the new combine IC-SBBR process to treat swine wastewater, that the full advantages of the combine process can realize biological nitrogen and phosphorus removal efficiently; the system start-up conditions optimization and the feasibility engineering applications were detailed studied.The laboratory test result indicated that with the vaccination of some anaerobic sludge, the IOC reactor through 62d domestication, the volume load promotion to 6kg COD/(m3·d), COD removal rate achieved 81.5%, anaerobic granular sludge size increases, but under the anaerobic environment, some organic nitrogen converted to the inorganic nitrogen, caused the effluent NH4+-N concentration of IOC reactor was higher than the influent, the SBBR vaccination originated from the Municipal Sewage Treatment Plants oxidation ditch's active sludge, through 24d domestication, COD, NH4+-N and the TP removal rate could achieve 85%,90%and 87%separately, and the SBBR operation steady, the SBBR appropriate operating condition was enter 0.25h, anaerobic 3h, aerobic 7h, precipitation 0.5h, drain 0.25h, idle 1h and arranged putty time 7d.In the laboratory research, the process had the high ability on removal of COD and NH4+-N, but the total nitrogen (TN) average removal rate only reached 28.5%; The optimization of SBBR operation mode to increase the oxygen-anoxic alternating frequency and increases 30%raw swine wastewater could promotion COD, NH4+-N and specially TN removal rate, increased the oxygen-anoxic alternating frequency caused the TN removal rate achieved 78.6%. Increases 30%raw wastewater made the TN removal rate promotion to above 50%, for reducing the nitrite disturbance on the phosphorus, TP removal rate also achieved above 80%, the system's stability obtains the enhancement.At the same time, the article also discussed the possibility of simultaneous methanogenesis with denitrification and anaerobic ammonium oxidation process realize on the IOC-SBBR system, the laboratory findings indicated anaerobic ammonia oxidation activeness was 4.12 mg NH4+-N/(gVSS-h) or 6.65 mgNO2--N/(gVSS-h) after the process start-up successfully, the anaerobic granule sludge assumed the sorrel, the pellet assumed the spherical anomalous ellipse, the anomalous short pole small spherical bacterium stayed in the sludge, which is the character of anaerobic ammonia oxidation bacterium, the nitrite removal rate was always higher than the nitrate in IOC reactor, the NO2-N/NH4+-N removal ratio was about 1.44, which was higher than anaerobic ammonia oxidation theoretical values 1.32, this can be explained in addition to the dominant anaerobic ammonium oxidation reactions, denitrification was also achieved on partial NO2-N and NO3-N removal in the IOC reactor.Based on the laboratory research foundation, further project's application research also achieved, the demonstration engineering research indicated:through increases 30%raw swine wastewater in the SBBR reactor to strengthen the biochemistry ofthe anaerobic digesting fluid, COD, NH4+-N and the TP removal rate obtained the obvious promotion, which enhanced 38.9%,12.15%and 7.2% respectively. The constructed wetlands was auxiliary the IOC-SBBR process to further denitrogenation of the nitrogen and phosphorus removal, the combined process had the high ability removal on swine wastewater, through 16 month steady operations, the combined process had the average removeal rate on COD 96.5%, NH4+-N 89%, SS 96.2%, TP 86%. The effluent quality of the combined process achieved GB 18596-2001 "Poultry Fish breeding and poultry raising Pollutant discharge Standard", equivalent tons of waste water treatment costed of 1.27 yuan, the combined processs achieved a good ecological and social benefits.