EM applications

Microbes require some time to act upon waste and wastewater, hence the retention time of effluents or sewage in the tank(s) of a treatment plant is an important factor. Treatment plants with a retention time of a few hours have little chance to improve performance without enlarging their overall tank volume.
Microbes in general can break down bio-degradable waste much easier than chemical and synthetic effluents. The addition of animal dung (or human waste) can enhance the microbial activity for the breakdown of other waste.  
Biocidal agents such as chlorine, disinfectants, detergents and other hygiene inputs should be minimized in all cases of biological (microbial) treatment or completely eliminated, independent of EM input in particular.

Recommended initial dosage should be activated EM solution (AEM) 1 liter in 500 liters wastewater to be applied daily for the first 10 days. Subsequently frequency of application can be decreased to once every second day or every third day. Once the objectives of EM application have been achieved, frequency of application can be further reduced to once a week.

Go by the targets to be achieved, e.g. to eliminate odours, to reduce COD and BOD levels etc., and measure the impact of EM. Please note that EM will mobilize (and subsequently break down) sludge and scaling which might result in increased turbidity (increased TSS). This phenomenon might reach its maximum after about one month, and subsequently will decrease and change into an improving curve. Odour control in general can be achieved even when other parameters such as, for example, COD, BOD, TSS, etc. are still high. Both, a rise in TSS and control of bad odours, will be good signs that EM "works".

Once the optimum impact has been established, decrease the dosage of EM input (increase dilution) to the most cost-efficient level.
Under EM use over several months, generation of sludge will be decreased and hence sludge removal operations will be less frequently required. Further, aeration time can possibly be decreased – as EM works under anaerobic conditions – and electricity expenses be saved.

Users are advised to get technical guidance for the use of EM in a domestic sewage treatment system, to define the optimal site of introduction of EM, the most cost-efficient dosage, and parameters for the assessment of success.
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