A backwash recovery unit can ...
Published by Brian Juma
A backwash recovery unit can be included in the water treatment system . when you backwash the sand and carbon filters, that backwash water is briefly held in a tank with an auto-desludge function and when enough of the water has accumulated in the tank(after a series of periodic backwashes), it's pumped through secondary set of sand and carbon filters(whose backwash will not be recovered!) and back to the raw water reservoir.
For cooling tower, where makeup water is flowing in continuously and draining is done manually based on TDS analysis, its better to install an automatic TDS control system, which is simply a TDS probe or series of probes in the cooling tower basin which are linked to automatic valves (make-up an drain), so that make-up and/or basin drain occurs at precise TDS values such that there is no oversupply for makeup or excessive draining.
1 Comment
Thank you very much Brian. Do you have a specific company example, where the co either used the backwash recovery approach or converted to an auto TDS system, with information on costs, usage prior to and after, etc?
Published by Dan Nienhauser
1 Comment
we have a beverage plant in Kenya, where the water treatment system was installed together with a recovery unit. The sand and carbon filters are back-washed on a weekly basis, each consuming 43 and 27 cubic meters respectively totaling to 80 cubic meters per week and 320 cubic meters per month. Through the recovery system, we are able to recover over 70% of this quantity with remainder serving as supply for the for backwashing of the recovery sand and carbon filters which is normally not recovered.
Unfortunately the cooling tower plumbing has not been sufficiently metered to provide actionable data.
Published by Brian Juma