The process of wastewater is generally conducted using the Biological method. This method is the most effective method compared to chemical and physical methods. The process of waste processing using biological method is a method-using microorganism as a catalyst to decompose material containing in wastewater. The microorganism self-decomposes and erase material contents and also to make the material decomposing into the place for the breeding of microorganism. The method of activated sludge is a process of wastewater process that utilizes these microorganism processes.
Today activated sludge is a method of the most usage of wastewater process included in Indonesia, it considers as this activated sludge can be used to process waste water from any kinds of industries such as food industry, hotel, housing, school, plant and so on. By implementing this system, it can be obtained pure water, which no longer contains poisonous organic compounds and dangerous bacteria for health. This water can be used again as water source for further industry activities. The recycling water we conducted can be usage safely for the need of water consumption such as cooling tower, boiler laundry, toilet flusher, watering plants, general cleaning, fish pond, car wash and so on.