![]() ![]() Rotating Biological Contactor: It involves allowing the wastewater to come in contact with a biological medium in order to remove pollutants in the wastewater before discharge of the treated wastewater to the environment.ĭ. Trickling Filters: Trickling filters, also known as sprinkling filters, are commonly used for the biological treatment of domestic sewage and industrial waste water. In this step biological and chemical processes are involved.Īctivated Sludge Process: This is used for treating industrial waste water using air and a biological floc composed of bacteria.Īerated Lagoons: Is a treatment pond provided with artificial aeration to promote he biological oxidation of waste water. Secondary or Biological Treatment: The objective of this treatment is the further treatment of the effluent from primary treatment to remove the suspended solids and residual organics. Primary Clarifiers: These are used to slow the velocity of the water to a point where organic solids will settle to the bottom of the tank and it contain an equipment that is used to remove floating solids and greases from the surface.Ĭ. ![]() Neutralization: The main purpose of this process helps in maintaining the pH range of 6-9 to meet the requirements of different processing units in ETP system. It permits particle removal by sedimentation and for filtration. It involves the addition of destabilized particles together into large aggregates so that they can be easily separated from the water.Ĭoagulation: is a process in which coagulants are added for the purpose of rapid settlement of minute solid particles in a liquid into larger mass. It includes:įlocculation: Flocculation is a physical process and does not involve the neutralization of charge. In this treatment both physical and chemical methods are used. Primary Treatment: Its aim is removal of floating and settleable materials such as suspended solids and organic matter. Removal of grit can prevent damaging of pumps & operational difficulties.Ĭlarifiers: These are tanks built with mechanical means for continuous removal of solids being deposited by sedimentation before biological treatment.ī. Grit Chamber: The wastewater that moves into the grit chamber removes the dense inorganic solids such as gravel, metal fragments and sand which have made their way into the sewers. Sedimentation: It is a physical water treatment process using gravity to remove suspended solids from water. A screen is a device with uniform openings and its purpose is to remove large floating solids. Screening: This is the first unit operation that occurs in waste water treatment plants. For example cloth, paper, plastics, wood logs etc. Preliminary Treatment: Its objective is physical separation of large sized contaminants. Industrial effluent treatment plant process include the following stages:Ī. Wastewater enters the effluent or sewage treatment plant and goes through several processes before effluent goes into the environment. The treatment of different effluents varies with the type of effluent. To reduce expenditure on water acquisitionĢ. To meet the standards for emission of pollutants set by the Government & avoid heavy penaltyĥ. To preserve natural environment against pollutionĤ. To reduce the usage of fresh water in industriesģ. To clean industry effluent and recycle it for further useĢ. The ETP Plant works at various levels and involves various physical, chemical, biological and membrane processes to treat waste water from different industrial sectors like chemicals, drugs, pharmaceutical, refineries, dairy, ready mix plants & textile etc.ġ. Since industrial waste water contains a diversity of impurities and therefore specific treatment technology called ETP is required. ![]() Effluents from food and beverage factories contain degradable organic pollutants. ![]() Some effluents contain oils and grease, and some contain toxic materials (e.g., cyanide). Industrial effluents contain various materials, depending on the industry. Effluent Treatment Plant or ETP is one type of waste water treatment method which is particularly designed to purify industrial waste water for its reuse and it’s aim is to release safe water to environment from the harmful effect caused by the effluent. ![]()
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