Plc Is Designed To Replace A Circuit Relay Sequential In A Control System

Emergency programmes under way to assistEmergency programmes under way to assist
municipalities - Creamer Media's Engineering Newsmunicipalities - Creamer Media's Engineering News
Engineering and environmental consultants SSI hasEngineering and environmental consultants SSI has
devised a number of emergency projects todevised a number of emergency projects to
assist the municipalities of the southern Capeassist the municipalities of the southern Cape
coastal belt, in light of the severe drought thatcoastal belt, in light of the severe drought that
the area is experiencing.the area is experiencing.
SSI communications manager Robin Hayes saysSSI communications manager Robin Hayes says
that during December, tourists flood the region,that during December, tourists flood the region,
swelling the resident population by up to fiveswelling the resident population by up to five
times, exacerbating the existing critical shortagetimes, exacerbating the existing critical shortage
of water.of water.
SSI water sector head Francis Gibbons says that,SSI water sector head Francis Gibbons says that,
in Sedgefield, the company specified a 1Ml/dayin Sedgefield, the company specified a 1Ml/day
mobile desalination reverse-osmosis plant, togethermobile desalination reverse-osmosis plant, together
with an upgraded membrane bioreactorwith an upgraded membrane bioreactor
wastewater treatment works (WWTW) thatwastewater treatment works (WWTW) that
enables the indirect reuse of final effluent. Newenables the indirect reuse of final effluent. New
boreholes have also been installed to augmentboreholes have also been installed to augment
ground and surface water supplies.ground and surface water supplies.
SSI's medium term solution for Knysna andSSI's medium term solution for Knysna and
George also involves indirect effluent reuse,George also involves indirect effluent reuse,
where final WWTW effluent is polished by anwhere final WWTW effluent is polished by an
ultrafiltration process and then pumped into theultrafiltration process and then pumped into the
towns' storage dams where it combines withtowns' storage dams where it combines with
fresh water from the rivers.fresh water from the rivers.