Page 488 - Industrial Wastewater Treatment, Recycling and Reuse

458 Industrial Wastewater Treatment, Recycling, and Reuse

Figure 11.16 Implementation of 3D TRASAR Technology for Membranes.
FL¼fluorometer, P¼pressure transducer, uS¼conductivity sensor, F¼flow,
T¼temperature.

sensors before and after the cartridge filter could also be connected. The data
from all these sensors is collected by the controller and transmitted to the
web portal via a wireless gateway.

11.3.3 Case Study

At a site where the 3D TRASAR Technology for Membranes was imple-
mented, a two-stage RO system was being operated to produce 100 gpm of
permeate for process-side application. The system was being run at only 60%
recovery and consumed 160 gpm of feed water.
The site was interested in obtaining stable water production, but at
reduced water consumption and lower total cost of operation.

11.3.3.1 Halogen Control
Prior to using 3D TRASAR technology, the halogen control was found to
be inadequate. A predetermined amount of sodium bisulfate (SBS) was
being added to the RO feedwater to control free chlorine. Only spot checks
on grab samples were possible due to limited personnel resources. While
occasional ORP surges were likely, there was no way to know of their
occurrence, because there was no online monitoring in place. ORP is used
to detect the existence of residual chlorine in the feed water for RO.