Odor Removal Of Domestic Garbage Leachate By Bio-trickle Filter

This paper is based on the project of Beijing shougang biomass energy projects. The theme is the biological purification treatment to the leachate stench gas.The main pollutants are hydrogen sulfide and ammonia gas. The author use EM bacteria groups and activated sludge as bacteria sources. According to the micro strain nutritional requirements, gas-liquid joint method is carry out for domesticating strains. Spraying the Nutrient solution to membrane the biological filter. This article is based on the theory research and combined with the requirements of project management. The design and construction tasks Finally completed. After processing,the gases reached national emission standards.This paper mainly discusses some factors and parameters. Filter materials need large specific surface area, good surface properties, certain porosity, rigid and anticorrosion. Compared to modified PE packing, zeolite packing is easier to hang membrane. Influence of a variety of microbiota process is better than a single microbiota. The ways of gas-liquid contacting has different extents to the biological deodorization system. This project system is downstream- contact. The treatment effect is small. But it can reduce the mist link, save the investment and operation cost.Actual operation shows that when the gas concentration below 35mg/m~3, various process in series cost more, and couldn't show the superiority. When dealing with high level concentration of gas, various process play a positive role. Similarly, other process parameters, such as the whole tower material, piping system material, temperature, downtime is importantly influent biological deodorization system.Practice showed that when adopting the gas-liquid combined domestication method and disposable row of activated sludge,the reaction start time lasts 15 days(about two weeks).The response time of the biological filter is 40 s, and the nutrient solution spray quantity is 15m~3/h. When the concentration of hydrogen sulfide gas is 27mg/m~3, 20mg/m~3 and 10mg/m~3, the corresponding hydrogen sulfide reduction rate is 99%. When the ammonia concentration is 36mg/m~3, 27mg/m~3 and 13mg/m~3, the corresponding reduction rate of ammonia is 90% and 90%, 95%. Therefore, when the concentration of hydrogen sulfide in 30mg/m~3, the reduction rate can maintain a higher level. On the contrary the ammonia reduction rate decrease when the concentration increase. Keeping the amount of nutrient solution at 15 m~3/h, hydrogen sulfide concentration at 20 mg/m~3 and ammonia concentration at 35mg/m~3, change the reaction time From 40 s to 60 s and 80 s, the reduction rate increase.When the reaction time extended twice, the removal rate increases only 5%. It shows that when it at the pollutant concentration, 40s' reaction time can meet to the requirements of removal.Excessive nutrient solution makes a gas-bacilli eutrophic state,and biofilm growth too thick, that Leads to frequently backwashing. On the contrary, spray quantity remaining too less, can also affects microbial removal ability. Therefore, the best amount of nutrient solution is 15m~3/h, and the replacement of total nutrient solution is about 1/3 every week.This paper discusses larger process parameters whitch influent to biological filtration deodorization efficiency. Such as inlet concentration, reaction time, amount of nutrient solution, the drip deodorization tower performance, device structure, material and the project cost are also optimized. This article summarizes the problems existing in construction and operation of the biological filtration deodorization device, and gives the solutions. It can also provide designers with practical application experiences, reference of engineering and research.