Water and waste water treatment
Wastewater treatment is a process used to remove contaminants from wastewater and convert it into an effluent that can be returned to the water cycle through the following processes.
Waste water inlet tank: a tank designated and constructed to receive and partially treat raw domestic sanitary waste water. Heavy solids settle to the bottom of the tank while greases and lighter solids float to the top.
Coarse & Fine screens: Coarse screens remove large solids: rags, and debris from wastewater: and typically have openings of 6 mm (0.25 in) or larger. Fine screens are typically used to remove material that may create operation and maintenance problems in downstream processes, particularly in systems that lack primary treatment.
Aerated Grit & Grease removal Tank: is designed to reduce horizontal flow velocity to allow
heavy particles to settle while grease and other floating substances are allowed to rise to the surface to be separated.
Primary sedimentation tank: is a normal sedimentation tank in which water is stored at rest for some time and sludge collected at bottom and oily matter collected at top are removed. After primary sedimentation process the wastewater is discharged into aerobic filter where activated sludge process take place
Aeration Tank: An activated sludge process where air is added into the water to encourage microbial growth. The microbes in the water feed on the organic material and form flocks that then settle out.
The Secondary Sedimentation Tanks are circular tanks equipped with rotating mechanical sludge and scum collectors. Appurtenant systems include spray systems for moving scum and for odor control: and pumps for draining tanks.
The primary objective of sludge thickening is to concentrate the solids: thus reducing the volume of sludge. Thickeners may increase the solids concentration by a factor of 2 to 5 and produce a clarified liquid effluent. Thickening is accomplished by either gravity or dissolved-air flotation.
Anaerobic sludge digester: In this process, a large fraction of the organic matter (cells) is broken down into carbon dioxide (C02) and methane (CH4), and this is accomplished in the absence of oxygen.
Ultra Violet (UV) disinfectant unit: light disinfection is one water treatment system that can be used to remove most forms of microbiological contamination from water.
Sludge dewatering: is the practice of minimizing waste by volume to prepare for its effective disposal. Sludge originates during the process of treating wastewater before the water can be released back into the environment.
Air Blowers: are typically used to provide aeration in activated sludge plants and to promote aerobic digestion. They keep solids suspended in channels and in aerated grit chambers: which is absolutely necessary for a proper treatment ecosystem.