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A Big Step Towards Cleanliness And Hygiene

Sewage is a water-carried waste, in solution or suspension, that is intended to be removed from a specific place.  It consists mostly of grey or black water. It is characterized by rate of flow, physical condition, chemical and toxic constituents and its bacteriologic status.
Types of sewage
·         Domestic/sanitary sewage: The wastewater from residences and institutions, carrying bodily wastes, washing water, food preparation wastes, laundry wastes, and other waste products of normal living.
·         Commercial wastes: Liquid-carried wastes from stores and service establishments serving the immediate community.
·         Surface run-off: is that portion of precipitation that runs rapidly over the ground surface to a defined channel.
Types of pollutants
Organic pollutants and nutrients: sewage is a complex mixture of chemicals, with distinctive chemical characteristics. These include high concentrations of ammonium, nitrate etc. Sewage also contains the nutrients nitrogen and phosphorus.
Pathogens and micro-pollutants: Sewage can be monitored for both disease-causing and benign organisms with a variety of techniques. Traditional techniques involve filtering, staining, and examining samples under a microscope.It is highly essential to eliminate sewage from our surrounding to prevent all kinds of air and water borne diseases. To eliminate sewage, we need to undertake sewage treatment.
Sewage treatment is the process of removing contaminants from wastewater, primarily from household sewage. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater.
Treatment includes three stages;
Primary treatment: consists of temporarily holding the sewage in a quiescent basin where heavy solids can settle to the bottom while oil, grease and lighter solids float to the surface.
Secondary treatment: removes dissolved and suspended biological matter. Secondary treatment is typically performed by indigenous, water-borne micro-organisms in a managed habitat. Secondary treatment may require a separation process to remove the micro-organisms from the treated water prior to discharge or tertiary treatment.
Tertiary treatment: Treated water is sometimes disinfected chemically or physically prior to discharge into a stream, river, bay, lagoon or wetland, or it can be used for the irrigation of a golf course, green way or park. If it is sufficiently clean, it can also be used for groundwater recharge or agricultural purposes.
With suitable technology, it is possible to reuse sewage effluent for drinking water, although this is usually only done in places with limited water supplies.
Lashari group is highly proficient in providing sewage cleaning along with some additional services. To know more about our services, visit our website at www.lasharigroup.com



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