Conclusions & Recommendations
To recycle the backwash and RO reject water.
To recycle backwash and RO reject water for better utilization of water and help in its conservation. Implementation Details:
Plant type: WHC 21 RO
Sales per day: 6000 Litres
Capacity of RO: 1000 Lph
It is a batch process divided into three stages,
Initial stage: The sump is filled with half of the backwash water of DMF, ACF and half of RO reject water through filtration sump, and this water is pumped to raw water tank. Second stage: The sump is filled RO reject water, and this water is pumped to raw water tank. Final stage: The remaining portion of the raw water tank is filled with raw water. From the above three stages the raw water tank is filled with 5000 litres of water. This water can be used directly for the treatment without any alum dosage. Outcome:
S.No| Raw water usage (lts)| Water used for process| Backwash water| Product water| Ro reject water| Total wastage (lts)| 1| 5000| 3000| 2000| 900| 1600| 3600|
2| 5000| 5000| 0| 1800| 3200| 3200|
3| 5000| 5000| 0| 1800| 3200| 3200|
4| 5000| 3000| 2000| 900| 1600| 3600|
5| 5000| 5000| 0| 1800| 3200| 3200|
Total| 25000| 21000| 4000| 7200| 12800| 16800|
S.No| Raw water usage (lts)| Water used for process (lts)| Backwash water (lts)| Product water| Ro reject water (lts)| Total (lts)| | |...