A trickling filter uses filtration, adsorption, and assimilation for removal of contaminants from wastewater. Wastewater should flow in a thin film over the media to allow time for treatment. The media serves as a substrate where a biological film grows and is fed by the nutrients contained in the wastewater.
What is biological treatment How is trickling filter used in waste water treatment?
Biological Trickling filters are an aerobic treatment device that removes organic material from wastewater by using microorganisms attached to a media. This mechanism is employed in many different technologies, including rotating biological contactors and packed bed reactors.
What is trickling filter explain with diagram?
A trickling filter is a type of wastewater treatment system. It consists of a fixed bed of rocks, coke, gravel, slag, polyurethane foam, sphagnum peat moss, ceramic, or plastic media over which sewage or other wastewater flows downward and causes a layer of microbial slime (biofilm) to grow, covering the bed of media.
How do trickling filters and activated sludge methods help in sewage water treatment?
- Trickling filters are intended to treat particularly strong or variable organic loads.
- The activated sludge process (ASP) is an aerobic biological wastewater treatment process that uses microorganisms, including bacteria, fungi, and protozoa, to speed up decomposition of organic matter requiring oxygen for treatment.
What is the purpose of the under drain system in a trickling filter?
The underdrain system provides a space below the trickling filter for the collection of treated wastewater and also allows for ventilation, to supply air to the biofilm. Ventilation can be achieved naturally as a result of the temperature gradient between ambient air and air in the trickling filter.
What bacteria is used in trickling filters?
Explanation: Facultative bacteria are used in trickling filters. Pseudomonas and Alcaligenes are some of the strains used in these filters. Also, Flavobacterium and Achromobacter are also used in this type of treatment.
Which process is used in trickling filter?
Trickling filters use aerobic processes for treatment while anaerobic filters operate under strictly anaerobic conditions. TFs enable organic material in the wastewater to be absorbed by a population of microorganisms attached to the medium as a slime layer.
How many types of trickling filters are used in sewage treatment?
4. How many types of trickling filters are used in sewage treatment? Explanation: The trickling filters are divided into conventional and high rate trickling filters.
Is trickling filter primary or secondary?
secondary treatment
Trickling filters are a secondary treatment after a primary setting process (see also septic tanks or pre treatment). The trickling filter consists of a cylindrical tank and is filled with a high specific surface area material, such as rocks, gravel, shredded PVC bottles, or special pre-formed plastic filter media.
Is trickling filter activated sludge process?
Activated sludge is a suspended culture system in which the biomass is mixed with the sewage. In contrast, trickling filter is an attached culture system in which the biomass is grown on media, and the sewage passes over its surface. This is the key difference between activated sludge and trickling filter.
Which is better activated sludge or trickling filter?
Furthermore, in comparison with similar methods, such as activated sludge, trickling filters are significantly more cost-effective as they don’t require artificial aeration and have a smaller demand for operational space resulting in cost reduction.
What are the 4 steps of sewage treatment?
Treatment Steps
- Step 1: Screening and Pumping.
- Step 2: Grit Removal.
- Step 3: Primary Settling.
- Step 4: Aeration / Activated Sludge.
- Step 5: Secondary Settling.
- Step 8: Oxygen Uptake.
- Sludge Treatment.
Which phase of sewage treatment are trickling filters sometimes used?
The secondary stage of treatment removes about 85 percent of the organic matter in sewage by making use of the bacteria in it. The principal secondary treatment techniques used in secondary treatment are the trickling filter and the activated sludge process.
What are the problems associated with the operation of trickling filter?
Following are the various types of troubles which occasionally occur at the site and operation of trickling filters: 1. Odour Nuisance 2. Ponding Nuisance 3. The Fly Nuisance.
Which of the following is a disadvantage of a trickling filter in waste water treatment?
- Requires regular operator attention.
- Possible accumulation of excess biomass that cannot retain an aerobic condition and can impair Trickling Filter performance.
- Additional treatment may be needed to meet more stringent discharge standards.
- Odor problems.
- The cost of construction is high.
What causes ponding in a trickling filter?
A condition occurring on trickling filters when the hollow spaces (voids) become plugged to the extent that water passage through the filter is inadequate. Ponding may be the result of excessive slime growths, trash, or media breakdown.
How do trickling filters clean wastewater?
A trickling filter uses filtration, adsorption, and assimilation for removal of contaminants from wastewater. Wastewater should flow in a thin film over the media to allow time for treatment. The media serves as a substrate where a biological film grows and is fed by the nutrients contained in the wastewater.
What is the percentage of water in trickling filter?
Explanation: For plastic type high filtration rate trickling filters, the BOD removal efficiency is 60-90%. This is lower than rock type low filtration rate trickling filters. The BOD removal efficiency rate is highest only when low filtration rate type trickling filters are used.
Which of the following impurities are removed in trickling filter process?
The microorganisms absorb the organic matter in the sewage and stabilize it by aerobic metabolism, thereby removing oxygen-demanding substances from the sewage. Trickling filters remove up to 85 percent of organic pollutant from sewage.
What are the 3 types of filtering processes?
There are several filtration methods : simple or gravity, hot and vacuum filtrations. The selection of the appropriate method is typically dictated by the nature of the experimental situation. The answers to each these questions help dictate what type of set up is required.
Which of the following is the advantage of trickling filter?
The main benefits of a biological trickling filter include a simple design, small footprint, good organics removal, and energy efficiency.