Water Treatment
Davis & Shirtliff HO Water Treatment Department under Bernard Rono have successfully implemented, tested and commissioned a large Dayliff Ultrafiltration plant complete with pumping units for Dawat-E-Hadiyah (Saifee Park).
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Davis & Shirtliff Uganda have supplied and installed a Water treatment plant for Hima Cement C/O the Contractor Optimum Earth. The plant that utilizes Reverse Osmosis technology which purifies over 8,000 litres of Water per hour.
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Water Aid, a nongovernmental organization in Tanzania, approached D&S Arusha in search of a water treatment solution for two boreholes sunk to provide water for community purposes.
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St. Andrew's Turi, a preparatory and secondary school in central Kenya with a student population of approximately 600 students, approached D&S to conduct a detailed water audit on their existing water supply and water treatment system.
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D&S recently undertook a project to supply a 5m3/hr Dayliff Seawater Reverse Osmosis (SDRO) plant to the Faza island in Lamu. The RO plant will be used to treat seawater for use in by the Faza community.
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D&S recently designed and supplied a containerized (20ft) water treatment plant for use by the Somali Development Fund facility in Somalia for their potable water requirements.
The plant included a 2m3/hr Dayliff Ultrafiltration Plant upstream of the 1m3/hr Dayliff Reverse Osmosis plant. The Dayliff Ultrafiltration acted as a pretreament to the Dayliff Reverse Osmosis plant and included smart PLC based Control Panel that controlled the operation of the electric actuated ball valves and pressure transducers that controlled the different Ultrafiltration plant processes for the smooth operation of the plant.
Pre-treated water from the Ultrafiltration plant was then transferred to the 400L break tank (T400) where the Dayliff Reverse Osmosis Plant low pressure pump would draw the water and transfer the water to the High Pressure pump of the Dayliff Reverse Osmosis plant for treatment before finally being transferred to the clean water storage tank. The break tank included several float switches controlled from both the Ultrafiltration and reverse osmosis control panels to ensure smooth operation of two plants within the container.
Key Dayliff Ultrafiltration Design features
- Feed flow max 2.8m3/hr @<3.5bar -DDS750
- CIP flow 1.5m3/hr @0.5bar -DDS750
- Air blower 12Nm3/hr @0.75bar -CL420HS
- Backwash flow 5.1m3/hr @2.5bar -DDS750
- Filtrate flow 1.6m3/hr
Key Dayliff Reverse Osmosis Design features
- Feed flow max 1.6m3/hr @>2bar –DDS750
- High Pressure pump flow 2m3/hr @9.54 -Grundfos CRN3-19
- CIP flow 3m3/hr @0.5bar -DDS750
- Permeate flow 1m3/hr @6.12pH
- RO recovery 62.50%
- Membrane type BW30-4040 (5no.)
Other features
- Recycle flow 0.4m3/hr @7.90bar
- Concentrate flow 0.6m3/hr @7.90bar
- Feed TDS 4756ppm
- Permeate TDS 66.22ppm
- Pass average flux 27.6LMH
- Feed Cl- 450ppm
- Feed after recycle Cl- 595ppm
- Concentrate Cl- 1178ppm
- Permeate Cl- 12.60ppm
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D&S recently undertook a project to supply a 7m3/hr Dayliff Reverse Osmosis (DRO) plant to the Unilever Factory in Nairobi. The client required us to design a solution to treat their municipal source of water to target reduced TDS levels and adjust the PH to the required levels for their processing plants at a rate of 7m3/HR. The RO plant was designed at 72.50% recovery and used DOW filmtec BW30-400 membranes to produce a permeate TDS of 0.83ppm from raw water TDS of 102ppm.
The system incorporated pre-treatment using glass media and activated carbon respectively for reduction of turbidity and removal of chlorine.
The controls are achieved from a single control panel that automatically controlled the operation of the plant, facilitating the filtration cycle that produced potable water and the feed flushing cycle which help clean the membranes. The system also provided for a Cleaning in Place (CIP) system fully integrated on skid for the RO CIP requirements.
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Dundori Road, Industrial Area
Nairobi
P.O Box P.O Box 41762 - 00100
Kenya
