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Thursday, September 20, 2007

EM technology

EM Technology Of Waste Water Treatment :

EM - short for "Effective Micro-organisms.

EM is a liquid culture of aerobic and anaerobic micro-organisms mainly sourced from human food processing and from nature. It consists of lactobacilli, yeast, photosynthetic bacteria, ray fungi and filamentous fungi. It does not contain any genetically modified organisms, is safe and easy to handle, and harmless to human health even if accidentally ingested.

EM offers benefits in the following fields of activities: Solid waste management, sewage and effluent treatment, hazardous waste treatment, hygiene management, and environmental regeneration.

METHOD OF PREPARATION OF EM SOLUTION:

One liter of EM stock solution and 1 kg or 1 liter of organically grown jaggery (or of molasses) are to be mixed with 20 liters of water. The water has to be clean and free from chlorine. The container should be of food-grade plastic. (Glass or metal containers are not appropriate as the development of gas may cause the container to break or explode.). It should be clean, not contaminated with chemicals, and have an airtight lid. As little air as possible should be left in the container (between the liquid and the lid). As gas pressure will develop, the lid will have to be opened everyday for a second to release it.

For the period of activation, in tropical regions , the container has to be placed in shade at ambient temperatures (20-40 degrees Celsius) without exposure to strong temperature fluctuations. Depending on actual ambient temperatures, extended EM (abbreviated as EMe or EMa) will be ready after five to ten days: This is verified by a pH of or lower than 3.5 and a pleasant sweet-sour smell.

Thus from one liter of EM stock solution and one kg (or liter) of jaggery, 22 liters activated EM solution ready for use can be produced. In hygiene, EMa is being used full strength or in dilution with water up to 1:100, in farming in dilutions ranging from 1:200 to 1:1,000, and in wastewater treatment diluted (with effluent or sewage) up to several thousand times. With one liter of EM stock solution, 2,200 liters (if EMa is diluted 1:100) or 22,000 liters (if EMa is diluted 1:1,000) of solution can be produced, and even bigger volumes of effluents can be treated.

Package Treatment plant: Upflow aerobic Bio Reactor module

The module consists of  a) Bio Reactor with EM technology, b) Tube Settler

The effluent will be pumped at an average flow rate to the Biological reactor. .This is basically attached growth upflow aerobic bio reactor.The flow will be from the bottom of the reactor to the top overflow weir of the reactor.

The biological reactor is fed with 200 Liter of EM solution.

The clarified wastewater collected from the collection launder of reactor is sent to the tube settler.The clarified waste water is sent to the disinfection tank/ sewer.

Because of the new method, the size of the treatment plant reduces by 10 -15 % thereby reducing capital cost.

Also Maintenance cost is minimised .

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