Design of a car wash waste water treatment process for local car wash stations

Jamil Ahmad, Muhammad Umar, Syed Shujaat karim, Muhammad amaduddin, Feroz Shah, Iltaf Hussain

Abstract


The car wash water treatment and recycling study was conducted using laboratory scale coagulation flocculation followed by sand & gravel filtration unit. Results obtained have been submitted for publishing and currently under review process. Based upon the results obtained a treatment and recycling process was designed for the actual 16.2 m3/day car wash water. The process comprised of a coagulation flocculation tank, coagulation storage tank, a sand and gravel filter and a final treated water storage tank. Different design options along with merits and demerits of each one were proposed. The final design selected includes coagulation flocculation tank underground, the sand & gravel filter at a height of 6 m above the ground level while the coagulant storage tank and the treated water storage tank at the ground level.  The design dimensions of various units calculated given as 1 m3 of coagulant storage tank, coagulation flocculation tank with 4.35 m height and 2.175 m diameter, A sand and gravel filter with 2.5 m2 surface area and a 20 m3 water storage tank. The total cost of the treatment system including fixed cost of Rs 407049 and running cost of 438135 was calculated as Rs 845184.


Full Text: XML JPIChE 45(2) 2017 ID 371 JPICHE 45 (2) 2017_PDF

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