Home Earth changes Earth changes Aerated Grit Chamber - Perfect Grit Chamber Design For Wastewater Treatment

Aerated Grit Chamber – Perfect Grit Chamber Design For Wastewater Treatment

An aerated grit chamber is an expanded channel or long basin in which the cross-section is increased to reduce the velocity of the flowing sewage adequately to cause heavy inorganic wastewater such as grit, sand and gravel of size 0.2 mm, and larger wastewater discharged solids to settle, while the lighter organic matter remains in suspension. This is used to remove solids having specific gravity greater than water.

This article takes a look at 4 important factors you must consider when you design a grit chamber:

(i) Velocity Of Flow

Velocity of wastewater flow must be 0.3 m / sec. This will permit the deposition of the bulk of heavier mineral solids in wastewater while most organic matter remains in suspension. A velocity of flow in the range 0.15 – 0.3m / sec. is generally recommended. In order to keep the velocity within the desirable limits, it is usually necessary to provide two or more channels to manage fluctuations in sewer flow.

(ii) Period Of Detention

One minute (volume of the grit chamber / flow rate) is the retention time normally employed. Since sedimentation of granular solids is dependent to a large extent upon the surface area of ​​the aerated grit chamber, their width could be kept large. A length to width ratio of 8 to 1 may be used limiting the effective depth to about 2 m.

(iii) Method Of Cleaning

Grit chambers are cleaned by hand, mechanically or hydraulically. Hand cleaning is done only in the case of smaller plants, is less hygienic and odor-free though somewhat easier for disposing off the removed material than in the case of mechanical cleaning.

(iv) Grit Storage

Storage space for grit may be provided through the length of the aerated grit chamber or by means of one or more pits deeper than the reminder of the basins. Concentration of grit is also useful for cleaning purposes. Channel may be provided with a frequency of cleaning of 15 days.



Source by Richard Runion

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Must Read

Why global leaders must address climate change now | Stories

Global leaders are now gathered in Poland for the United Nations-sponsored climate talks (COP24). The summit marks the most significant meeting on climate...

10 Ideas for Green Community Projects

Are you looking for a way to get your office or community group involved in "greening up" your city? There are plenty of great...

Monsoon Of The Province Of Punjab

In the Punjab province of Pakistan, the monsoon rain can be divided into three distinct regions according to the amount of rainfall and its...

Devastation, Earthquake

This most recent devastating earthquake that occurred in Nepal, Japan a few years ago, and the two that occurred in Chile and Haiti was...

Global Warming Defined

What is the definition of global warming? If the weather - related calamities happening all around you is not enough to...
Support