In recent years, the demand for clean water has increased due to the rapid growth of urbanization and industrialization. To meet this demand, the wastewater treatment industry has been using various techniques to remove pollutants from wastewater. One such technique is the use of effective microorganisms (EM) to generate more microorganisms in the MBBR tank and aeration tank, which helps to reduce the BOD and COD in wastewater.
Here we will discuss what EM means, how to prepare EM solution for STP commissioning, and how it helps in wastewater treatment.
What are Effective Microorganisms?
Effective microorganisms are a combination of naturally occurring beneficial microorganisms that can enhance the performance of wastewater treatment systems. These microorganisms include lactic acid bacteria, yeasts, and photosynthetic bacteria, among others. They are typically found in soil, water, and plants.
How to prepare EM (Effective microorganisms) Solution for STP?
The EM solution can be prepared by fermenting a mixture of molasses, water, and EM inoculant. The fermentation process takes around one week and is typically carried out at a temperature of around 25-30°C. The EM solution is then ready to be added to the STP commissioning process.
EM can help restore the microbial balance in the wastewater treatment process by breaking down the organic matter and reducing the BOD and COD. To prepare EM solution for STP commissioning, one method is as follows:
· One litre of ‘instant solution’ is made by mixing 10 ml of EM, 40 ml of molasses and 950 ml of water and leaving it for five to seven days, depending on temperature.
· The solution is then added to 1 litre of molasses and 98 litres of water to obtain 100 litres of ready-to-use EM solution. This amount is enough for three pits.
· The EM solution is introduced into the STP system in a controlled manner, depending on the size and capacity of the STP, as well as the specific conditions of the wastewater.
How EM helps to generate more Microorganisms in the MBBR Tank and Aeration Tank?
The addition of EM to the MBBR tank and aeration tank helps to create a more diverse and robust microbial community. The microorganisms in the EM solution provide a food source for the existing microorganisms in the tank, leading to the growth of more microorganisms. This increase in microbial activity helps to reduce the BOD and COD in wastewater.
EM also helps to improve the efficiency of the wastewater treatment process. The microorganisms in the EM solution can break down complex organic compounds that are difficult to degrade by conventional treatment methods. Additionally, EM can help to reduce the amount of sludge produced during the treatment process, which reduces the need for sludge disposal.
Summary:
Effective microorganisms are a valuable addition to wastewater treatment systems. They can help to improve the efficiency of the treatment process by generating more microorganisms in the MBBR tank and aeration tank, which in turn helps to reduce the BOD and COD in wastewater. The preparation of EM solution for STP commissioning is relatively simple and involves fermenting a mixture of molasses, water, and EM inoculant. By using EM, wastewater treatment facilities can achieve better treatment performance, reduce sludge production, and ultimately provide cleaner water to the community.
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