Water is a renewable resource, but sometimes must be treated to make it back to use. The treatment is the conversion process used or contaminated water into something suitable for what should be used for the next, or even return to its natural state. Turning waste into something that can be reused is a complex process and can only be done well in an installation of a treatment plant wastewater. This type of treatment of all solids, bacteria, plants, inorganic compounds, organic compounds and algae in the water environment that can be used as drinking water, once it has been through all different levels of filtration. The pretreatment treatmentPre is the process that all easily removable remove large objects. The nature of the parts that are removed during treatment include fats, oils and fats, sand, gravel, stones, rags and feminine hygiene products and other larger particles that are easily filtered. Primary TreatmentIn first stage of processing, raw sewage flows through the primary clarifiers that large tanks. These tanks are large enough that the sludge can be resolved and all materials such as grease and oil floating on the surface where they can be skimmed. They are equipped with mechanical scrapers that sludge collected in a funnel ride. TreatmentThe secondary treatment where wastewater from human waste, food, soap and detergents will be demolished and turned into compost through aerobic biological process that accelerates the process. After payment, goes through a series of filters to clean all the other little things, like bacteria and algae. There are several types of filters, including a trickling filter and biological aerated filters. Twin fluid oxidation of solid waste is spread over the surface of a deep bed of carbonized coal, limestone chips or specially fabricated in plastic media that has a raised surface of the biofilm that liquid passes through the support form.The gradually purifying filter medium biofilm bacteria, protozoa and fungi. The final steps of the filtering process of sand filtration, which also eliminates the waste material and activated carbon filtration to remove any toxins still in DisinfectionWastewater liquid.Nutrient Extraction and contains high levels of nutrients like nitrogen and phosphorus can be very harmful in large doses. Nitrogen is removed by oxidation, which converts nitrate to nitrogen gas and then removed from the water by releasing into the air. Phosphorus is removed through the use of chemicals such as salts of iron or aluminum. The final step the water passes through the disinfection stage where chlorine or ultraviolet light is used to disinfect water and be ready for human consumption. This last step of water becomes contaminated liquids recovery and clean water.