Experimental Studies On The Purification Of Organic Sulfur Odors Compounds In The Bio-trickling Filters

Volatile organic sulfur compounds are the major class of chemicals associated with odor. There are challenges in the sampling, detection and removal of the trace level odor organic sulfur compounds due to their volatility and mutability. Currently, the testing method of their concentration is not perfect. The detection technology was established to detect the trace concentration of volatile organic sulfur compounds in the atmosphere, which included cryogenic trap adsorption, thermal desorption and gas chromatography. Series of adsorption–thermal desorption experiments were conducted to determine the effects of important operating parameters. The compounds studied were ethyl mercaptan and dimethyl sulfide. Ethyl mercaptan and dimethyl sulfide were effectively adsorbed by activated carbon in sampling tube which frozen by liquid nitrogen. The saturated adsorption capacity is 0.1 g/g – 0.3 g/g; the optimum desorption temperature was 230 ?and the time was 200 min with nitrogen volume flow rate 20 ml/min. The average relative standard deviations of the actual values and the measured values is less than 5 %, when the concentrations ranged from 50 ppb to 8 ppm. The detection limits the method in this paper were ppb concentration level.Biological trickling filter treat organic pollutants with various characteristics such as long service life, easy-controlled reaction and powerful resistance to impact load, has caused more and more attention. This paper studied the effects of different operation factors on the removal of dimethyl sulfide?DMS? in the biological trickling filter. The main data are shown as follows:The active sludge from the wastewater plant can get the advantage bacterial by inoculating and domesticating. The biological trickling filter is applied to remove dimethyl sulfide?DMS?, which used the domesticated active sludge to seed. The method in this paper can greatly shorten the form-film time by controlling the nutrient and inlet concentration in the bio-trickling filter.The effects of the inlet concentration of DMS, the gas flow rate, the sprinkling rate and the frequency on the biological trickling filter were studied. The removal efficiency of DMS decreased with the increase of the inlet concentration of DMS, but the biochemical removal quantity increase. When the gas flow rate increased, the removal efficiency of DMS decreased, while the removal quantity increased from 8mg/h to 50 mg/h. With the sprinkling rate increased from about 4 L/h to 6 L/h, the removal efficiency increased from 90 % to about 99%, and then reached a steady state. When the sprinkling rate exceeded 10L/h, the removal efficiency decreased with the increase of sprinkling rate.Michaelis–Menten equations are applied to describe the degradation reaction in the biological trickling filter, and get the concentration distribution in the filter and the model of biodegradation. This paper use the experimental results to verify the theory model, which can count the kinetic constants,K_m=18.7 ppm, ?_max=112.1g/m3 h. The model validation is utilized by experimental results, which showed that the correlation of simulation predicted values and experimental results on the removal efficiency and outlet concentrations were more than 90%, the correlations of the values of model and experiment are very good.