| The continuous prosperity of today's social economy has greatly improved people's quality of life,and it has also triggered more and more environmental problems,among which stench is one of the typical environmental pollution.H2S is a relatively common malodorous gas,which has the characteristics of colorless,toxic,flammable,etc.,and has great harm to human health and ecological environment.The biological deodorization method is one of the main methods for controlling malodorous pollution.The biological trickling method has the advantages of small reactor volume,high purification efficiency,convenient operation,small pressure drop,easy control of reaction conditions,etc.,and is widely used in removing malodorous gasesIn order to effectively control the emission of H2S,this paper used the self-made biological deodorization trickling filter to study the rapid domestication and enrichment of sulphur bacteria,the rapid biofilm culturing and start-up of the reactor,and the efficient and stable operation conditions of the reactor.The results showed that1.The rapid enrichment of sulphur bacteria is of great significance for the effective treatment of malodorous gases containing H2S and the rapid start-up of bio-trickling filter.Based on the comparative analysis of various cultures of sulphur bacteria,this paper independently developed a culture solution that rapidly domesticated and enriched sulphur bacteria:Na2S2O3 5H2O,1.0%;K2HPO4,0.3%;NH4C1.0.2%;MgCl2,0.05%;CaCl2 6H2O,0.02%;Sublimation sulfur powder,0.2%.Using the culture solution,the sulphur bacteria were domesticated in a subculture manner at an optimum initial pH of about 6.0,dissolved oxygen DO?5mg/l,and an average room temperature of 25?.By the third generation(after 7 days),enriched with a large number of sulphur bacteria2.The initial start-up of the trickling filter.The domesticated and enriched sulphur bacteria were used as strains to compare the effects of different membrane inoculation methods on the start-up of the reactor.The results showed that:The method of injecting membrane in the tower was more conducive to the start-up of the trickling tower.The trickling tower started until day 6 at 25? when the volume load was 11g/(m3·h),the H2S removal rate reached 100%and remained stable.In this experiment the in-line packing membrane inoculation and the gas-liquid phase reverse circulation membrane starting method could realized the quick start-up of the trickling tower reactor,and the loading of the packing membrane and the start-up of reactor could be completed in a total of 9 days3.The start-up again of the trickling filter.The 40-day idle trickling filter was restarted under the volume load of 10.4g/(m3·h)and the low temperature conditions of 8?15?.The results showed that:The trickling filter reactor had a high level of impact load resistance and a quick restart-up function,and the removal rate reached 99%on the sixth day of restart-up,and then remained 100%stably.4.The trickling filter reactor was operated stably,and the effects of various process conditions on H2S removal efficiency were studied.The results showed that:(1)The trickling filter reactor has the ability to efficiently and stably remove H2S gas,under the conditions that the H2S inlet concentration was 45?135mg/m3,the intake air amount was 0.4?1.6m3/h,the shortest empty bed residence time was 10.8s.and the maximum volume load was 45g/(m3·h),the removal rate of H2S was stable to 98%and above.(2)In this experiment,The gas-liquid ratio means the ratio of the optimum intake air volume to the circulating fluid volume of the trickling filter reactor using ceramsite and charcoal as the filler is 167.(3)The trickling filter reactor has strong resistance to low pH.The pH of the circulating fluid dropped from 3.1 to 1.26 over 21 days,and the H2S removal rate of the reactor was always maintained above 98.6%.(4)When the volume load of the trickling filter reactor was 28g/(m3·h),the removal rate of H2S could reached more than 99.2%in the temperature range of 26?34?;When the temperature was lower than 10?,the trickling filter removal efficiency rapidly dropped below 90.9%.5.The trickling filter reactor has high removal capacity for NH3.When the NH3 inlet concentration was in the range of 10mg/m3?121 mg/m3,the trickling filter stabilized the removal rate of 98.7%and above,and the outlet gas concentration was up to 0.6mg/m3,Which is stable to meet the first-level plant boundary emission standards. |
PDF Full Text Request