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The flow rate was adjusted to 10.2 ± 0.46 L/h. Greywater treated using two-stage sand filtration was further disinfected using bleaching powder. The average hydraulic loading rate, organic loading rate, and HRT observed in the filtration study were as given in Table 4.

Table 4

Average loading rates during two-stage filtration study

 HydraulicOrganic loading rate
 
Filterloading rate (L.h−1.m−2)(kg BOD5.m−2.d−1)(kg BOD5.m−3.d−1)HRT (h)
Sand filter stage I (SF1) 70.2 0.153 0.309 2.4 
Sand filter stage II (SF2) 70.2 0.089 0.180 2.4 
 HydraulicOrganic loading rate
 
Filterloading rate (L.h−1.m−2)(kg BOD5.m−2.d−1)(kg BOD5.m−3.d−1)HRT (h)
Sand filter stage I (SF1) 70.2 0.153 0.309 2.4 
Sand filter stage II (SF2) 70.2 0.089 0.180 2.4 

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