Study On Elimination Of Sulfur Hydrogen Odor At Middle And Low Concentration By Using A Bio-Membrane

The odor from sulfur hydrogen (H2S) is extensive and toxic even at low concentrations. Sulfur hydrogen could also damage the health of human being and corrode equipments. In addition, it can be oxidized to SO2 by oxygen and ozone, resulting in acidic rain and destroy our environment. Therefore, decreasing H2S concentration and its odor is in great demand in both environmental and economic aspects. Biological method, among many available ones, has great advantages to eliminate odor from H2S because it needs simple equipment, is easy to be operated and economical without secondary pollution. In the experiment, the biological membrane system was used to decrease the H2S concentration and its odor and results of the experiment were achieved as follows:1. Suitable resources and media were selected for the growth of microbes used to decrease the H2S concentration. After domestication of the microbes, the cleaning efficiency of H2S could be up to 90℅and the elimination capability could be up to 1290mg/L. 2. It was recognized that the main microbes used in the experiment are FeSO4 bacillus,sulfur bacteria,and amoebae, among which the FeSO4 bacillus was dominant.3. The ranking of the efficiency from high to low are: Activated carbon (zeolite (Raschig ring; mix filling ( pure filling; three layers ( two layers ( one layer.4. The suitable ecological conditions for microbial degradation of sulfur compounds are: temperature at 30℃, the nutrient sprinkling rate at 10L/h, aeration rate at 0.16m3/h with incoming H2S concentration at 20mg/L, pH at 2.0, under which, the cleaning efficiency of H2S could be up to 99.5℅. When the incoming H2S concentration was increased to 60mg/L, the efficiency could still reach 90℅. 5. The suitable incoming H2S concentration for zeolite,Raschig ring are low 20mg/L apart; two layers pure and mix fillings are low 40mg/L and 60mg/L apart; then three layers mix fillings is low 80mg/L.6. Under three layers filling and incoming H2S concentration between 60 and 80mg/L, the cleaning efficiency on H2S of the bio-membrane system could be 95℅. When the incoming H2S concentration was reduced to 60.0 mg/L, the efficiency could be up to 100℅. The operating time of biological filling tower system could last as long as19d. So to sum up, Under three layers filling, the cleaning efficiency of the microbes which cultivated and domesticated from sludge to H2S is best. It provides a aavailable method to solve the pollution issue of H2S of middle concentration. Appliant:Wang Fan Major:Ecology Supervisor: Prof.Li Shuqin...