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Spent backwash water is either discharged without treatment to a sanitary sewer system or is treated and recycled within the plant. [4]: 22.37–22.40 Historically, backwash water was discharged directly to surface water supplies; however, direct discharge is now highly regulated through NPDES discharge permits and is often discouraged.
Pentair plc (PNR) is an American water treatment company incorporated in Ireland with tax residency in UK, with its main U.S. office in Golden Valley, Minnesota. [6] Pentair was founded in the US, with 65% of company's revenue coming from the US and Canada as of 2017.
A relief valve DN25 on cooling water pipe from heat exchanger Schematic diagram of a conventional spring-loaded pressure relief valve. A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; excessive pressure might otherwise build up and create a process upset, instrument or equipment failure, explosion, or fire.
Backwash: Water is directed through the resin in the direction opposite to that of normal flow, and the output is sent to a drain for disposal. This ten-minute process flushes out solids, and expands the resin bed.
Backwash (physical phenomenon), also known as "swash", the backwards flow of air or water; A mixture of beverage and saliva that has flowed back into a drinking vessel; Backwash ileitis, the involvement of the terminal part of the ileum in ulcerative colitis, following the ascent of the condition from the rectum
Self-cleaning screen filters incorporate an automatic backwash cycle to overcome these limitations. [which?] Backwash cycles are far more frequent when compared to a media filter with similar capacity, and each backwash requires far less water to perform. Their ability to quickly remove contaminants from water before they leach their nutrients ...