Reuse of gray water for landscape culture / [electronic resource].

Year book of Misr Society of Agricultural Engineering : The 20 th. Annual Conference of the Misr Society of Agricultural Engineering "Agricultural Engineering and Country Challenges"

Includes references.

A lab scale system of rotating biological contactor (RBC) was used for
treating gray water, in the present study, to be used in landscape culture.
The system was modified with a provision to vary the speed (rpm) of
rotating discs. hydraulic retention time (HRT) and discs suiface area. The
reactor had four different rotating speeds 2, 3. 4 and 5 rpm. Six different
hydraulic retention times 15, 30, 45, 60, 75, 90 min, and three different
2disc suiface area 48 xI01, 64 xlrJ and80 xlrJ cm , Among those different
factors in treating gray water, it was found that the rotational speed of 4
rpm yields better percent removal of COD at 72.5%. Hydraulic retention
time 90 min yielded better percent removal of COD at 74.28%. Disc
suiface areas of 80xlr J cm 2 yielded better percent removal of COD at
76.47%. After achieving the optimum condition, a glass hollse experiment
was set up to examine the effects ofgray water irrigation on the growth of
Epiprenl/ llinJ {ll/relin J and Syngollium podophyllum plants, and some
soil properties. The experiment treatments included in the study were:
irrigation with treated gray water, irrigation with potable water, and
irrigation with raw gray water. Results showed that gray water irrigation
had no significant effect on stem length, number ofleaves and leaf suiface
area.

Summary in Arabic