Study On CS₂ And H₂S Removal In Compound Bio-filter

CS2 and H2 S are stimulating odour gases from industry,cellophane and traditional production process flow and fiber cotton viscose fiber industry produce a mixture of CS2 and H2 S gas.Causing great harm to environment and human health,the CS2 and H2 S arouse people’s attention.Sulfur gases governance is urgently needed.Due to its low energy consumption,less investment, simple equipment and less secondary pollution,biological method is more and more applied to the treatment of low concentration organic waste gases.The experiment is using the compound bio-filter to remove the CS2 and H2 S.The compound bio-filter is a combination of bio-trickling filter and bio-filtration reactor. The hollow ceramic balls are applied as packing material of bio-trickling filter and the wood chips and the polyhedral hollow balls are applied as packing material of bio-filtration reactor. CS2 is the source of sulfur in the experiment.The activated sludge which comes from Fulening chemical plant is cultured and domesticated.After that,the thiobacteria are inoculated on the surface of packing material to develop the bio-film.In the process of the experiment,the impacts of the gaseous flow rate,the inlet concentration and the recycle liquid flow rate need further study.The main experimental findings are as follows :(1)In the experiment of biological method to handles the CS2 alone,the inlet concentration and the gaseous flow rate have greater influence on the removal rate.Increasing of the influx concentration or the gaseous flow rate can make the removal rate reduced.When the gaseous flow rate increases from 0.1m3/h to 0.7m3/h, the removal rate of CS2 decreased from 74.01% to 52.16%.When the inlet concentration increases from 212.9mg/m3 to 929.3mg/m3,the CS2 removal rate decreases from73.82% to 43.54%.With the increasing of the recycle liquid flow rate,the CS2 removal rate increases at first and then deceases.When the recycle liquid flow rate reaches 15 m L/min, the highest removal rate reaches 79.72%.The removal load of the CS2 packing material can achieve to 6.58mg/(L·h);(2)With the experiment going on,the packing pressure rises with time,but the pressure of bio-trickling filter rises slowly, ultimately stays in about 310 Pa,the pressure of the bio-filtration reactor stays in about 634Pa;(4)In the experiment of biological method to handles the CS2 and H2 S simultaneity,various factors have the same influence on the removal rate.Due to the introduction of H2 S and CS2 into competition relations,the removal rate reduces.The removal load of the CS2 packing material can achieve to 4.25mg/(L·h),the removal load of the H2 S packing material can achieve to 5.92mg/(L·h);(5)According to the theory of adsorption-biofilm,the experiment value is close to the theoretical value.The corresponding related coefficient of CS2 are R=0.995,R=0.964,R=0.985;the corresponding related coefficient of H2 S are R=0.994、R=0.993、R=0.996.The results of the experiment show that it has higher removal rate by using compound bio-filter to get rid of the CS2 and H2 S.It provides basis data for the industrial generalization and application.