Trickling filter

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

Preparing fermentation residue, useful in e.g. fish culture, comprises separating solid, post-fermenting, treating anaerobic discharge, separating biomass, post-purifying, adding mineral salt, concentrating and producing carbon dioxide

Abstract: Preparing fermentation residue, as a complex system for e.g. energy, comprises separating solids from fermentation residue; post-fermenting the residue; treating the anaerobic filter discharge; degrading N-substrates; separating the biomass remainder and low-molecular components; post-purifying water, ion exchanger and/or zeolites; adding mineral salt solutions through a mineral mixture; disinfecting water; concentrating the algal culture and producing the carbon dioxide for algal culture from the flue-gas wash of the combined heat and power plant (CHP) and/or from biogas cleaning. Preparation of fermentation residue, as a complex system for energy, water and nutrients, comprises separating solids (raw fibers) from the fermentation residues by means of decanters, separators or other suitable filter mechanisms; post-fermenting the fermentation residue in anaerobic fixed bed reactors for further biogas production and for C-decomposition; subsequently treating the discharge of the anaerobic filters by means of aerobic trickling filter for further C-decomposition; subsequently degrading N-substrates over a combined anaerobic/aerobic-step; separating the biomass remainder over external or immersed ultra-filtration modules; separating the low-molecular components by single- or multi-stage reverse osmosis; post-purifying water by combined cascade for the retention of residual impurities like organic compounds, ammonium or sulfide by means of activated charcoal, ion exchanger and/or zeolites; adding suitable mineral salt solutions over or through a mineral mixture for mineralizing the water for rearing fish or cattle watering tanks; disinfecting water with UV, ozone or other disinfection systems such as tetrachlorodecaoxide additives; concentrating the algal culture to algal concentrates by ultrafiltration as base for fish fodder; and producing the necessary carbon dioxide for algal culture from the flue-gas wash of the combined heat and power plant (CHP) and/or from biogas cleaning, where the low-temperature waste heat from CHP is transformed to current; the waste heat of the membrane filtration procedures (ultra-filtration and reverse osmosis) is useful for aquaculture in the produced water; and reverse osmosis concentrate is useful for algal cultures as fodder base for aquaculture.

Trickling filter mythology

Abstract: Engineering practice in trickling filter design has been influenced by the propagation of myths as much as by the analysis of data and factual determinations. In this paper, several common myths encountered by the writer in his engineering practice are examined. The myths are tied to source(s) where possible, and then the factual underpinnings (if any) are examined. Common myths include the following: (1) Trickling filter processes are less reliable than activated sludge processes; (2) trickling filters are poor performers in cold weather; (3) trickling filters are more expensive; (4) motorized distributor speed control is always needed; (5) cross-flow media should not be used at total organic loadings exceeding 1.6 kg BOD5/m3⋅d and (6) all media are created equal.

Experimental Study on Maize Cob TricklingFilter-Based Wastewater Treatment System:Design, Development,and Performance Evaluation

Abstract: In developing countries, good-quality water is contaminated due to the disposal of untreated municipal and industrial wastewater (WW) into natural water reservoirs. Most of the wastewater is not treated properly according to international standards, and usually is disposed of and/or utilized for irrigation without appropriate treatment. The main hurdles in providing wastewater treatment (WWT) in developing countries include high costs, and the poor design, installation, and operation of conventional WWT systems. Therefore, the present study explores the maize cobs trickling filter-based (MCTF) low-cost WWT option for developing countries like Pakistan, India, and Bangladesh. In this regard, indigenous media trickling filter was designed and developed using maize cobs as packing material for biofilm growth. The MCTFWWT system was continually operated and monitored for six months at constant hydraulic wastewater loading of about 113±2 m3 per m2 per day. The experimental data covers winter and summer seasons with temperature variations from 23oC to 43oC. System performance was evaluated by means of various WWT parameters, including biological and chemical oxygen demands (BOD5 and COD), total suspended and dissolved solids (TSS and TDS), turbidity, and color – before and after WWT. Experimental results showed that the MCTF-WWT system successfully removed about 79% BOD and 75% COD on average. The key reason for effective BOD and COD removal was rapid development of microbial film (within the first two *e-mail: muhammadsultan@bzu.edu.pk DOI: 10.15244/pjoes/63657 2266 Imran A., et al.

Wastewater treatment in trickling filters using luffa cyllindrica as biofilm supporting medium

Abstract: Domestic sewage treatment experiments were conducted in trickling filters in laboratory pilot plants in which the peeled dehydrated fruits of Luffa cyllindrica were used as a support medium for microbiological growth, in order to verify its capacity to remove organic matter, measured in terms of Biochemical Oxygen Demand (BOD5,20) and Chemical Oxygen Demand (COD). Other parameters such as suspended and settleable solids were also measured. The results obtained, when compared to results from similar pilot plant using stones as supporting medium, and with the removals predicted by classic formulas used for trickling filters design, indicated that this support medium may substitute with advantages, under specific conditions, the traditional support media. Further studies are recommended.