A novel treating technology for nitrogen removal from soybean wastewater was studied. The process for nitrogen removal was achieved by alternating aeration and mixing, combined with real\|time control strategies. Resu...A novel treating technology for nitrogen removal from soybean wastewater was studied. The process for nitrogen removal was achieved by alternating aeration and mixing, combined with real\|time control strategies. Results showed that the COD and total nitrogen removal rates are more than 90% and 92% at COD and total nitrogen loads of 1\^0-1\^2 kg COD/(kgMLSS·d) and 0\^20-0\^27 kg TN/(kgMLSS·d), respectively. In addition, it could improve sludge settling property. SVI value is less than 70 g/ml during the whole cycles. The method not only may be adapted to treat soybean wastewater with high nitrogen, but also may be applied to treat other high nitrogen wastewater.展开更多
An innovative shortcut biological nitrogen removal system, consisting of an aerobic submerged membrane bioreactor （MBR） and an anaerobic packed-bed biofilm reactor （PBBR）, was evaluated for treating high strength ...An innovative shortcut biological nitrogen removal system, consisting of an aerobic submerged membrane bioreactor （MBR） and an anaerobic packed-bed biofilm reactor （PBBR）, was evaluated for treating high strength ammonium-bearing wastewater. The system was seeded with enriched ammonia-oxidizing bacteria （AOB） and operated without sludge purge with a decreased hydraulic retention time （HRT） through three phases. MBR was successful in both maintaining nitrite ratio over 0.95 and nitrification efficiency higher than 98% at HRT of 24 h, and PBBR showed satisfactory denitrification efficiency with very low effluent nitrite and nitrate concentration （both below 3 mg/L）. By examining the nitrification activity of microorganism, it was found that the specifc ammonium oxidization rate （SAOR） increased from 0.17 to 0.51 g N/（g VSS.d） and then decreased to 0.22 g N/（g VSS.d） at the last phase, which resulted from the accumulation of extracellular polymers substances （EPS） and inert matters enwrapping around the zoogloea. In contrast, the average specific nitrite oxidization rate （SNOR） is 0.002 g N/（g VSS.d）, only 1% of SAOR. Because very little Nitrobactor has been detected by fluorescence in situ hybridization （FISH）, it is confirmed that the stability of high nitrite accumulation in MBR is caused by a large amount of AOB.展开更多
为建立城市污水主流厌氧氨氧化脱氮系统并研究其温室气体N2O排放特征,采用低氧SBBR处理模拟生活污水并获得了94.1%的TN去除率。连续试验及批量试验结果表明,高效脱氮是部分硝化-短程反硝化耦合厌氧氨氧化共同耦合作用结果。典型周期内N2...为建立城市污水主流厌氧氨氧化脱氮系统并研究其温室气体N2O排放特征,采用低氧SBBR处理模拟生活污水并获得了94.1%的TN去除率。连续试验及批量试验结果表明,高效脱氮是部分硝化-短程反硝化耦合厌氧氨氧化共同耦合作用结果。典型周期内N2O排放呈快速上升、波动式快速下降、缓慢消失的规律,其中第75 min N2O排放速率最高,达6.7μg/(L·min),推测是由于低氧硝化过程中羟胺氧化作用所致。高通量测序揭示了体系内同时存在着厌氧氨氧化、好氧异养、反硝化、硝化等功能菌属,与系统脱氮和N2O产生密切相关。展开更多
文摘A novel treating technology for nitrogen removal from soybean wastewater was studied. The process for nitrogen removal was achieved by alternating aeration and mixing, combined with real\|time control strategies. Results showed that the COD and total nitrogen removal rates are more than 90% and 92% at COD and total nitrogen loads of 1\^0-1\^2 kg COD/(kgMLSS·d) and 0\^20-0\^27 kg TN/(kgMLSS·d), respectively. In addition, it could improve sludge settling property. SVI value is less than 70 g/ml during the whole cycles. The method not only may be adapted to treat soybean wastewater with high nitrogen, but also may be applied to treat other high nitrogen wastewater.
文摘An innovative shortcut biological nitrogen removal system, consisting of an aerobic submerged membrane bioreactor （MBR） and an anaerobic packed-bed biofilm reactor （PBBR）, was evaluated for treating high strength ammonium-bearing wastewater. The system was seeded with enriched ammonia-oxidizing bacteria （AOB） and operated without sludge purge with a decreased hydraulic retention time （HRT） through three phases. MBR was successful in both maintaining nitrite ratio over 0.95 and nitrification efficiency higher than 98% at HRT of 24 h, and PBBR showed satisfactory denitrification efficiency with very low effluent nitrite and nitrate concentration （both below 3 mg/L）. By examining the nitrification activity of microorganism, it was found that the specifc ammonium oxidization rate （SAOR） increased from 0.17 to 0.51 g N/（g VSS.d） and then decreased to 0.22 g N/（g VSS.d） at the last phase, which resulted from the accumulation of extracellular polymers substances （EPS） and inert matters enwrapping around the zoogloea. In contrast, the average specific nitrite oxidization rate （SNOR） is 0.002 g N/（g VSS.d）, only 1% of SAOR. Because very little Nitrobactor has been detected by fluorescence in situ hybridization （FISH）, it is confirmed that the stability of high nitrite accumulation in MBR is caused by a large amount of AOB.
文摘为建立城市污水主流厌氧氨氧化脱氮系统并研究其温室气体N2O排放特征,采用低氧SBBR处理模拟生活污水并获得了94.1%的TN去除率。连续试验及批量试验结果表明,高效脱氮是部分硝化-短程反硝化耦合厌氧氨氧化共同耦合作用结果。典型周期内N2O排放呈快速上升、波动式快速下降、缓慢消失的规律,其中第75 min N2O排放速率最高,达6.7μg/(L·min),推测是由于低氧硝化过程中羟胺氧化作用所致。高通量测序揭示了体系内同时存在着厌氧氨氧化、好氧异养、反硝化、硝化等功能菌属,与系统脱氮和N2O产生密切相关。
