Water Pollution and Control: Trickling Filter

 Trickling Filter


A trickling filter is a bioreactor system that removes organic matter from wastewater. It is a secondary treatment process that uses microorganisms to break down organic compounds in liquid waste. 

How it works

·         Wastewater is distributed over a bed of packed media, such as gravel, rock, or plastic 

·         Microorganisms attach to the media and form a biofilm 

·         The microorganisms metabolize the organic matter in the wastewater 

·         The biofilm grows thicker as the organic matter is converted into new cellular material 

A trickling filter is a wastewater treatment system that uses a bed of material to remove organic matter from wastewater. The filter bed is made of a material with a large surface area, such as gravel, rocks, or plastic. Wastewater is sprayed onto the bed, where it trickles down and comes into contact with microorganisms that grow on the material. The microorganisms remove organic matter from the wastewater, producing water and carbon dioxide. Parts of a trickling filter 

·         Filter medium: A bed of material, such as gravel, rock, or plastic, that the microorganisms attach to

·         Enclosure: A container that houses the filter medium

·         Wastewater distribution system: A system that distributes wastewater over the filter medium

Benefits

·         Trickling filters are used to treat municipal and hazardous wastes 

·         They are an aerobic treatment system that promotes aerobic microbial growth in the upper layers and anaerobic growth in the lower regions

Working

1.      Wastewater is sprayed onto the filter bed. 

2.      The wastewater trickles down and comes into contact with microorganisms that grow on the material. 

3.      The microorganisms remove organic matter from the wastewater. 

4.      The biological film grows in thickness as it absorbs organic matter from the wastewater. 

5.      When the film becomes too thick, it breaks off and washes down through the bed. 

6.      The treated wastewater is collected and sent to a settling tank. Trickling filters are also called biofilters or biological filters. 


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