Re-use of Spent Filter Backwash Water by Micro strainer in Water Treatment Plants

Abstract

In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW)
has been investigated. The results show that physicochemical and biological quality of
SFBW can be added to the inlet water but it must be treated with microstrainer filter. The
SFBW was passed through standard membrane with 5,18,40,70 µm size and filtered SFBW
was analyzed. 5, 18 and 40 µm membrane showed respectively the best results. Applying
5 µm membrane that the best results found removing amount of biological factors
include: diatom 85.77 to 90 percent, Cyanophyceae 100%, Crustacean 100%, Rotifer 100%,
and removing percent of physicochemical parameters include: Turbidity 44.78%, Iron
51.24% and Manganese 35.35%. In present study 18 µm membrane is economical
membranes because after filtering the SFBW with 18 µm membrane can be added to the
inlet water