Water Recycling in Community Water Systems

Report on Recycling of backwash and RO reject water

Content: Objective Rationale Implementation Details Schematic diagram Process Outcome Conclusions & Recommendations Illustration

Objective:
To recycle the backwash and RO reject water.
Rationale:
To recycle backwash and RO reject water for better utilization of water and help in its conservation.
Implementation Details:
Location: Naagulapalem
Plant type: WHC 21 RO
Segment: Wannabe
Sales per day: 6000 Litres
Capacity of RO: 1000 Lph
Schematic Diagram:
Source
BWT
RWT

Micron filters
MGF
ACF
RO Unit
Sump

Filtration sump

UVW

Storage tank
Transfer tank

Process:
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:
Before Recycling: 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 |

After Recycling: S.No | Raw water usage (lts) | Water used for process (lts) | Backwash water (lts) | Product water | Ro reject water (lts) | Total (lts) |