What is low rate trickling filter?

1. Low Rate Filters. They are also known as standard rate or conventional rate filters. The settled sewage is applied to the filter bed and after trickling through it, passes through the final sedimentation tank for removal of most of the stabilized solids.

What are the disadvantages of trickling filter?

Limited flexibility and control in comparison with activated sludge processes. They require high maintenance costs of rotary distributor center mechanisms. Any maintenance service for the rotary distribution mechanism would require a crane and complete removal of the rotary distributor mechanism, guy rods, and arms.

How do you increase the efficiency of a trickling filter?

The performance of some trickling filter plants can be improved with minor additions or revisions, e.g.: 1. Additional recirculation pumping capacity may be provided by installing larger pump impellers with higher horsepower motors. Plant performance will be improved.

What is the typical organic loading rate for a low rate trickling filter?

Low-rate filters are commonly used for loadings of less than 40 kilograms five day biochemical oxygen demand (BOD5)/100 meters cubed per day (25 lb BOD5/1000cu ft/day). These systems have fewer problems than other filters with regards to filter flies, odors, and medium plugging because of the lower loading rate.

How do trickling filters work?

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 necessary to trickling filter?

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.

What is the working of trickling filter?

What are the advantages of trickling filter?

Advantages

Because of their large air-water interface can remove co2,h2s, n2 & other gases.
A portion of liquid in underdrain system is recycled:
It improves the treatment efficiency.
To dilute strength of incoming wastewater.
To maintain enough wetting of slime layer.
Prevents ponding in filter.
Suitable for shock loads.