Sewage is generated by industrial establishments also. In big manufacturing unit colonies are developed for workforce. Sewage includes household waste liquid from toilets, baths, showers, kitchens, sinks and so forth that is disposed of via sewers. In many areas, sewage also includes liquid waste from industry and commerce. The separation and draining of household sewage water for gardening and horticulture is universally applied.
Sewage may include rainwater runoff. Sewerage systems capable of handling rainwater are known as combined systems. . Heavy rainwater may overwhelm the sewage treatment system, causing a spill or overflow. Sanitary sewers are typically much smaller than combined sewers, and they are not designed to transport rainwater. Backups of raw sewage can occur if excessive Infiltration/Inflow is allowed into a sanitary sewer system.
Modern sewer developments tend to be provided with separate storm drain systems for rainwater. As rainfall travels over roofs and the ground, it may pick up various contaminants including soil particles and other sediment, heavy metals, organic compounds, animal waste, and oil and grease.
Sewage can be treated close to where it is created, a decentralised system (in septic tanks, biofilters or aerobic treatment systems), or be collected and transported via a network of pipes and pump stations. Collection and treatment is typically subject to local, state and central regulations and standards. Industrial sources of wastewater often require specialized treatment processes. Sewage treatment generally involves three stages, called primary, secondary and tertiary treatment:
Dew manufactures custom sewage treatment plant for industries. These plants are combination of various technologies such as aeration, settling, biological treatment, filtration, sedimentation, disinfection, sludge recycling, etc. For further details contact Dew.