An automatic sand filter unit for treatment of household wastewater

Project Advisor 

Dr.Sarawan Wongsa

Project Co-advisor

Dr.Thidarat Bunsri

Candidate:

Nattapon Pudchuchuen
Sittisak Naksrisung

Abstract:

Greywater is generated from daily water uses in households, the amount of greywater is ranged 152-430 L/capita-day and the averaged amount is 225 L/capita-day. Greywater can be recycled for the non-consumption, such as floor washing and gardening, when the greywater is primarily treated to reduce the suspended solids, oily residues and pathogen. This project is study of wastewater treatment by sand filter technique with automatic backwash. The greywater utilised in this study is collected from bathing and it may contains suspended and colloid particles that come from soap. The greywater is highly turbid. When the greywater is treated via sand filtration with automatic backwash uint, the suspended particles are separated, but the colloid particles are remaining. The turbidity test is introduced to examine the effluent quality. The turbidity of treated water still exceeds the allowable limit. So, the treated water is then returned to the sand filter again. However, the coagulant especially alum is recommended to be added prior to refiltration. This sand filter unit with automatic backwashing is designed to bring the maximum benefits in recycling greywater, aiming the reduction of pollutant in environment. The designed sand filtration unit with automatic backwashing can be serve the household as the system is user friendly.

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