Where does the Trickling filter come into play?
The trickling filter is an attached growth method, which means that the microorganisms responsible for treatment are connected to an inert packing material. Rock, gravel, slag, sand, redwood, and a variety of plastic and other synthetic materials are utilized as packing material in attachment growth techniques.
Working of Trickling Filters
1: In a trickling filter, wastewater is spread over the top of a tank holding non-submerged packing material.
2: Natural draft or blowers offer oxygen to the microorganisms developing as an adherent biofilm in the vacuum area.
3: During operation, the biomass connected to the medium metabolizes the organic material contained in the effluent. As organic materials extracted from running wastewater is synthesized into new cellular material, the biological slime thickens.
4: The depth of oxygen penetration into the microbial layer limits the thickness of the aerobic layer.
5: As the substrate is metabolized before it can reach the microorganisms at the medium face as a result of the increasing thickness of the slime layer, they lose their capacity to stick to the media surface and enter the endogenous phase. The liquid then washes the slime off the medium, allowing a fresh slime layer to form. Sloughing refers to the process of shedding the slime layer.
6: Sloughed-off film and treated wastewater are collected by an underdrainage system, which also allows air to circulate via a filter. The collected liquid is sent to a settling tank for solid-liquid separation.
7: Microorganisms linked to a large surface area medium are used in media filters to remove soluble organic materials assessed as biochemical oxygen demand or chemical oxygen demand from wastewater as it travels through the medium.
Anaerobic filters function under stringent anaerobic conditions, whereas trickling filters employ aerobic processes for treatment. Trickling filters and anaerobic filters are also known as biofilm reactors and attached-growth processes, and they include spinning biological contactors, submerged aerated biofilters, and a variety of new and unique technologies.
Filters for media of various types
Attached growth systems are successful when treatment filters use sand or peat as medium. They can be built as single-pass or recirculating filters, which means that the effluent is passed through the medium more than once. As the germs proliferate on the media, they are treated.
1: Filters made with sand
Sand filters are typically 2 to 3 feet deep beds of sand or other appropriate granular material.Typically, the media is kept within a liner consisting of concrete, plastic, or another impermeable substance. Partially treated wastewater is occasionally sprayed to the filter surface and treated as it gently trickles through the granules. Typically, wastewater is collected in an underdrain and flows to a treatment facility or disposal site.
2: Peat Filters
Peat filters purify wastewater using a two-foot covering of sphagnum peat moss. Unsterilized peat is home to a variety of microorganisms, including bacteria, fungus, and microscopic plants, making it a reactive and efficient filter.
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