Trickling filter

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

Trickling filter for biological treatment of waste water or sewage

Abstract: The present invention relates to a trickling filter for biological treatment of waste water or sewage, and it is characterized by that the upper portion of said trickling filter is equipped with seawge inlet line, washing water line and air discharging line, the lower portion of the equipment is equipped with air inlet line and water outlet line, and the interior of said equipment is equipped with a horizontal water-collecting plate with drain gully, said equipment is divided into upper and lower two portions by said water-collecting plate, the upper portion of the water-collecting plate is biological filter, and the lower portion is contact oxidation tank in which the ceramic soft filler is held. Said invention can implement second-level biological treatment of sewage, do not discharge excess sludge and waste gas and can reduce secondary pollution.

Effect of distribution nozzles on trickling filter performance

Abstract: The present study is an attempt to improve the tric kling filter performance by enhancing both the oxygen transfer rate and wetting percent of the media surface this was achieved using radial jet nozzle configuration instead of the conventional circular nozzle. The distributor-offset distance from the b ed was taken into consideration as a geometric variable parameter. Two pilot-scale tric kling filters were constructed on field to evaluate the effect of radial jet nozzle a nd offset distance on the trickling filter performance. Results indicated that the distributi on system has major effects on the trickling filter performance, and that radial jet n ozzle increased BOD removal ratio by approximately 10% higher than the conventional nozzle for fixed distributor and by approximately 7% for rotating distributor, radial j et nozzle also enhanced DO% on the filter effluent for fixed distributor but not for t he rotating one. The offset distance has approximately no effect on trickling filter perform ance. Increasing hydraulic loading rate reduced trickling filter efficiency, as the hy draulic retention time reduced.

Water Treatment and Related Technologies

Abstract: This chapter explores the techniques of water treatment. It illustrates a schematic representation of a general municipal water treatment plant. A combination of biological, chemical, and physical treatment processes allow treatment plants the ability to make available a sufficient supply of clean water for domestic, agricultural, and industrial use is employed. Such processes also help keep surrounding surface waterways uncontaminated as the result of regulated water discharge. The initial stage in the treatment of domestic wastewater is termed primary treatment. During this stage, physical processes such as screening and shredding in the bar rack remove debris (e.g., sticks and rags) and a portion of the contaminants that settle or float. Following this, secondary treatment begins with biological oxidation through activated sludge, trickling filters, or stabilization pond processes (or a combination of all of these). Finally, after the secondary treatment, the clarified effluent may require additional aeration and other chemical treatment (tertiary treatment) to destroy bacteria remaining from the secondary treating stage and to increase the content of dissolved oxygen (DO) needed for oxidation of the residual biological oxygen demand (BOD).

A biological trickling filter variable in filler volume and having a rollover-preventing upper pore plate

Abstract: The invention relates to a biological trickling filter variable in filler volume and having a rollover-preventing upper pore plate, and belongs to the technical field of biological desulphurization The biological trickling filter is provided to overcome a problem that fixed type upper pore plates in present trickling filters cannot be adjusted along with the volume or weight of fillers and non-fixed type upper pore plates are liable to roll over A gas feeding pipe is communicated with a gas inlet in the external wall of the trickling filter A lower pore plate and the upper pore plate are disposed in the trickling filter in order from bottom to top The lower pore plate is fixed to the inner wall of the trickling filter, and is above the gas inlet The upper pore plate is connected to acover plate at the top of the trickling filter through a plurality of elastic bars The bottom of the trickling filter is provided with a liquid outlet One end of a liquid conveying pipe is communicated with the liquid outlet, and the other end is provided with a liquid inlet The liquid conveying pipe is also provided with a branch pipe The tail end of the branch pipe is provided with a spraying head The spraying head is above the upper pore plate in the trickling filter The filler space in the trickling filter can be adjusted by itself, and rollover of the upper pore plate is prevented

Design of 90-mgd wastewater reclamation plant

Abstract: Ninety MGD of municipal secondary effluent is to be reclaimed for use as cooling water in the Palo Verde Nuclear Generating Station in Arizona. The water reclamation plant design criteria are presented for nitrification, lime-soda softening, filtration, and sludge processing. In-pipe storage is used for flow equalization. Forced air down-draft trickling filters with computer-controlled recycle are used for nitrification. Effluent recirculation is used to maintain constant sludge blanket dept in the upflow solids contact clarifier softening units. An influent flow-splitting, gravity-backwash, dual-media filter is used for final suspended solids removal. Rheological data was used in the hydraulic design of sludge piping. Computerized automatic flushing also aids in preventing sludge pumping problems. Reclamation plant design and construction are integrated in one Engineering-Procurement-Construction project conducted by a single company.