Trickling filter

About: Trickling filter is a research topic. Over the lifetime, 1098 publications have been published within this topic receiving 20219 citations.

A Multi-Parameter Sensitivity Analysis of a Model Describing the Fate of Volatile Organic Compounds in Trickling Filters.

Abstract: A frequency array technique was employed to assess the impact of process operating and design conditions, biofilm, and compound-specific properties on the fate of volatile organic compounds (VOCs) in trickling filter processes. The objective of the study was to identify the ranges of parameters over which model predictions of biodegradation, volatilization, and overall removal are particularly sensitive. The model was found to be most sensitive to liquid loading rates less than 20 m3/m2-d and gas loading rates less than 200 m3/m2-d. The model predictions indicate that an effective method for controlling VOC emissions is through control of trickling filter ventilation rates. Effluent recycle had only marginal impact on model predictions. Model predictions were most sensitive to biofilm thickness less than 1 x 10-4 m, liquid-gas mass transfer coefficients less than 0.10 m/d, Henry's law coefficients less than 0.10, and biodegradation rate coefficients less than 20 m3/kg-d. When employing the model for predictive purposes, greater care should be taken in defining parameters for compounds that lie within these ranges.

Optimization of the performance of a thermophilic biotrickling filter for α-pinene removal from polluted air

Abstract: Biodegradation of α-pinene was investigated in a biological thermophilic trickling filter, using a lava rock and polymer beads mixture as packing material. Partition coefficient (PC) between α-pine...

Nitrification Kinetics and Its RBC Application

Abstract: The surface reaction model for the mechanism of mass transfer-metabolism in the fixed-film nitrification process is investigated and discussed for the design of trickling filter systems and rotating biological contactor (RBC) systems. Two experimental studies are performed. The first study, using a stationary fixed-film reactor to simulate the trickling filter process, reveals that the surface reaction kinetics follow a pseudo-homogeneous model. The second study, using a bench-scale RBC unit, indicates that the pseudo-homogeneous model is also applicable to the rotating fixed-film process. The effective slime thickness of an RBC system can be estimated from this model by locating the optimum NH3-N removal rotating speed and finding the corresponding liquid film thickness at that rotating speed.

Efficiency of wastewater treatment plants at removing Giardia sp. cysts in southern France.

Abstract: A study was conducted to evaluate the removal efficiency for Giardia sp. cysts of a number of wastewater treatment plants in France. Of these, five were activated sludge systems, three were trickling filters and three were waste stabilisation pond systems. In addition, the effect upon cyst removal of disinfecting effluents prior to discharge into controlled waters by UV and chlorination was evaluated. Cysts were detected in raw wastewater at all 11 treatment plants in concentrations ranging from 130 to 41,270 cysts/litre. The removal of cysts by sewage treatment was found to range between 99.5 and 99.8% for activated sludge, 99.9 and 100% for waste stabilisation ponds, and for the trickling filter plants up to 98.3%. Despite the high removal efficiencies recorded in this study the range of cysts detected in final effluents discharged into controlled waters ranged from < 1 to 66 cysts/litre. This is undoubtedly an underestimate of actual occurrence and concentration in wastewater, given the limitations of the methods currently employed by investigators. Cysts were detected in final effluents which had been disinfected by both UV and chlorination (range 0.3-19 cysts/litre), however, it is not known whether such cysts were viable or non-viable.