Trickling filter

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

[Treatment of mix gas containing butyl acetate, n-butyl alcohol and phenylacetic acid from pharmaceutical factory by bio-trickling filter].

Abstract: The bio-trickling filter packed with ZX02 stuffing is used to treat the mix gases containing butyl acetate, n-butyl alcohol and phenylacetic acid(BBP), which are discharged from Penicillin workshop of Pharmaceutical Factory. The reactor was operated for 110 days to investigate the effect of influent load, retention time and spray water on the removal of BBP and the biodegradation characteristics. The reactor displayed preferential utilization of BBP, when the maximum influent load of BBP were 229.5g/(m3 x h), 275.4 g/(m3 x h) and 42.5g/(m3 x h), the removal efficiencies were 96%, 95% and 100% respectively. The results show that the bio-trickling filter can effectively treat the mix gases and the optimum parameters were as followed: retention time was 31.2 s, the volume of spray water was 4 L/(L x d). The bio- trickling reactor has strong ability to resist shock of high influent load and resistance is maintained at low value, what's more, it doesn't need to carry out back washing frequently. With all these advantages it can be operated steadily for long time.

Performance of a pilot-scale nitrifying trickling filter treating municipal aerated lagoon effluent.

Abstract: Colfax, WA, operates an aerated lagoon to achieve compliance with its National Pollutant Discharge Elimination System (NPDES) permit, which currently requires biochemical oxygen demand (BOD) and total suspended solids (TSS) removal. However, ammonia removal may soon be required, and Colfax is considering a nitrifying trickling filter (NTF) that would allow them to also maintain the lagoons. To obtain data from which to ultimately design a full-scale system, a four-year NTF pilot study was performed. Results demonstrated that an NTF would be an effective, reliable NH3 removal method and could produce effluent NH3 concentrations < 1.0 mg/L. NTF performance was characterized by zero- and first-order kinetics; zero-order rates correlated with influent NH3 concentrations and mass load. Utilizing data from these investigations it was determined that the pilot NTF could be reduced by 19%, which demonstrates the value of pilot testing. Finally, pilot data was evaluated to provide a data set that will be useful to engineers designing full-scale NTFs.

Transient modeling of trickling filters for biological ammonia removal

Abstract: A dynamic model for nitrifying trickling filters is developed, based on material balances in the biofilm and the bulk liquid. The model predicts the profile of ammonia as a function of the operating parameters (volumetric flow rate and feed ammonia concentration) and the biofilm thickness as a function of filter depth and time.

Mass transfer limitations on trickling filter design

Abstract: U. S. have exhibited severe oxygen transfer rate limitations. The growing use of trickling filters for the treatment of strong industrial wastes, both as "roughing filters" and as the terminal treatment process, increases the probability of de signing processes with built-in limitations. Examples already exist in which the neces sity of modifying standard municipal treat ment plant design criteria when industrial wastewaters are involved has been demon strated.1 Busch2 noted that oxygen transfer cannot exceed the rate of oxygen utilization and vice versa. This approach seems to be the simplest method of defining and estimating mass transfer limitations on trickling filters. By estimating the maximum possible rate of oxygen transfer, the maximum accept able rate of oxygen uptake is determined. Knowing the maximum oxygen uptake rate allows estimation of the maximum biochemical oxygen demand (bod) con centration in the waste water. Because the maximum bod concentration deter mined is that at the application point, a limitation on minimum recycle rate is also provided. This limitation is particularly useful for industrial wastewater treatment process design in which flow equalization is not a significant problem. The bod concentration specified will be the ultimate or total bod because this value reflects the reactive organic concentration. Oxygen Transfer Rate The description of liquid and air flow through a trickling filter and of the organic removal reactions is extremely difficult, and a number of approximations must be made. To begin with, flow is intermittent. Most trickling filters in use today have rotary distributors that provide a semi continuous liquid application. Once on the media, the flow would be expected to channelize; thus, conditions in small sec tions of the media are probably not homogeneous. In addition, two types of reaction systems may be described : quasi homogeneous systems resulting from cells suspended in the liquid and heterogeneous systems resulting from the uptake of organics by organisms in the slime. A schematic diagram of the flow and reaction system is given in Figure 1. The worst possible case would seem to occur when the liquid film entirely covers the media-slime surface. This is because oxygen transfer directly into the slime should be considerably faster than that through the liquid and into the slime. An estimate of the maximum rate of oxygen Liquid