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BOD and COD measurement for WTP : Week 8/17/2011

Dear Readers,

We have always been a knowledge driven company and believe in sharing our experience and knowledge with our customers. We do this through various publications including our recent studies on energy benchmarking. We successfully launched the Encon tips program last year. These tips are a series of carefully selected, simple yet effective measures that lead to quantum energy savings.

These Energy Conservation tips have received a very encouraging feedback from Industry.

We are now launching the 'Process Instrumentation Ideas'- a novel concept that is aimed at giving ideas in process instrumentation that are easy to work on, can be advantageous to the user and are aimed at benefiting society as well as Industry.

These will be sent to you fortnightly. Here is the first 'Process Instrumentation Idea' which is about energy conservation in Waste Water Treatment.

- Forbes Marshall

Can Waste Water treatment Waste your Energy?

In today's energy conscious world, industries look for innovative solutions for conservation. In a waste water treatment plant, a large share of energy consumption goes towards operation of mechanical systems designed to introduce oxygen into the waste water.

Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) are two ways of measuring the oxygen, which the effluent will consume, once it has been emptied into the receiving water body. In both situations, the consumption of oxygen is mainly caused by organic substances that have not been entirely decomposed by the effluent treatment system. It is important for the environment to continually lower levels of these parameters in order to preserve the receiving water bodies and their aquatic life. Current legislation also demands it.

There are many ways to control the Dissolved Oxygen (DO) levels in the effluent. Most of the systems that are used to do this are mechanical systems, that introduce oxygen into the waste water. Improper and inefficient utilization of these systems leads to not just fluctuating DO levels, but also inflated electricity costs. Moreover, it also has negative impacts on biological treatment, nitrification and other anaerobic and facultative processes.

The good news is, there are ways to achieve this objective by saving consumption of electrical energy.

Read more about it in our next article.