A Study On Water Treatment

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Chapter 3 - Water Treatment The next stage in this journey is where the raw water reaches the inlet at Lochranza Water Treatment Works (WTW) (see fig. 6.). This works was opened in 1999 in order to replace the basic chlorination plant that was in operation since the 1970’s. Lochranza WTW provides high quality drinking water to a combined population of approximately 500 customers in the villages of Lochranza, Catacol and Pirnmill. Fig. 6 Lochranza Water Treatment Works Inlet Works Similar to many burn sources, the raw water at Easan Biorach is both variable in quality and quantity especially during periods of rainfall. Lowland raw water sources are traditionally a poorer quality as they are normally located near populated areas exposed to sewerage, recreation, agriculture and industry. This makes treatment more expensive as the raw water can contain suspended solids, dissolved minerals and be high in colour. This however is not the case in Lochranza, because of its rural location there is very little exposure to pollution and a complicated treatment process is not necessary. Historically water treatment in Lochranza has been very basic as the raw water quality from the Eason Biorach is generally of a good standard. However there are standards set by the Water Supply (Water Quality) (Scotland) Regulations 2001 with regards to water quality that Scottish Water must adhere to and the following treatment processes are in place. Raw water from the Easan
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