摘要
压力曝气反应器采用压力曝气提高混合液的溶解氧及有机物降解速度，曝气压力为0．05～0．25MPa；密闭塔式结构，设备最佳高度与直径比为3：1．以乙醛废水为试验介质，在曝气压力分别为0．10，0．15，0．20MPa时，反应器中混合液溶解氧（DO）质量浓度达到5．0，7．5，10．0mg·L^-1；有机物降解速度（以化学耗氧量COD计）分别为5．80，7．20和9．50kg·m^-3·d^-1，为常压曝气的2．5～4．0倍．在曝气压力为0．15～0．20MPfl时，污泥表观产率为常压曝气的1／2～1／3左右，混合液微生物脱氢酶活性指示物（TF）质量浓度达到80μg·mL^-1．应用该反应器处理味精废水，污泥龄为5～8d，污泥质量浓度为3500-5000mg．L^-1，水力停留时间为7h，曝气压力0．10MPa，曝气量为处理水量的20-30倍，COD去除率达到97．7％，NH3-N去除率达到96．0％，处理出水达到国家一级排放标准．
The pressurized aeration bioreactor increases the concentration of dissolved oxygen（DO） in mixed-liquor in reactor and speeds up the biodegradation rate of organic matter in wastewater by pressurized aeration. The aeration pressure is within the range of 0.05 to 0.25 MPa. The bioreactor＇ s structure is hermetic tower, the optimum ratio of its height to diameter is 3 ： 1. To examine the reactor＇ s performance using aldehyde wastewater, when aeration pressure is 0.10, 0.15, 0.20 MPa, Do concentration in mixed-liquor is 5.0, 7.5, 10.0 mg·L^- 1 respectively and the biodegradation rate of organic matter is 5.80, 7.20, 9.50 kg· m^-3· d^-1 respectively. The data above is 2.5 -4.0 times of the value under traditional activated sludge process. The biomass yield rate descends about 2/3, and the indicating matter concentration （TF） of sludge dehydrogenase activity in bioreactor is up to 80 μg·mL^-1 under the pressure of 0.15-0.20 MPa. Using the reactor to treat monosodium glutamate wastewater, the COD removal rate of 97.7 % and NH3 - N removal rate of 96.0 % can be obtained when biosolids retention time is 5- 8 d, MLSS is 3 500 ～ 5 000 mg· L^- 1, hydraulic retention time is 7 h, aeration pressure is 0.10 MPa, air flow rate is 20-30 times of wastewater flow rate. This can certainly reach the national grade 1 of discharge standards.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第9期1219-1224,共6页
Journal of Tongji University:Natural Science
关键词
压力曝气
生物反应器
味精废水
设计参数
pressurized aeration
bioreactor
monosodium glutamate wastewater
design parameter.
