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Reverse Osmosis |
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Derwent's range of R/Os are developed to meet the demands of industry and commerce. This range utilises the most modern technology and computerised design facilities. Reverse Osmosis pre-treatment and post treatment options include:
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| Polyamide thin film composite membranes are used as standard, contained in glass reinforced housings. These membranes give consistent results with outstanding system performance. Polyamide thin film elements are also recommended for multi-element housings containing three or more membrane elements, as they are designed to withstand higher pressure drops. Our elements and R/O systems are also designed with energy and high rejection rates in mind to give the most cost-effective solution to the customer. |
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| A central control-panel houses the conductivity meter, which monitors the water quality leaving the plant and a PLC (programmable logic controller) to control the system. The main feed pump starter is in the control-panel and protected by an inlet water pressure switch. Flow rates are adjusted by regulating valves checked against inline flow meters for permeate and concentrate flows. |
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| One or more 5 micron cartridge filters are installed in a filter housing at the inlet to the plant. These filters protect the RO membranes. Their operation is monitored by pressure gauges and the low-pressure alarm after the filters. |
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| Derwent use Grundfos vertical multi-stage centrifugal pump fitted with a standard Grundfos motor. The pumps consists of a base and a pump head. The chamber stack and the outer sleeve are secured between the pump head and the base by means of stay bolts. All pumps are equipped with a maintenance-free mechanical shaft seal. |
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| The plant is mounted on a mild steel skid, protected by a two-pack epoxy finish. Stainless steel is used on the smaller range. Before despatch, the plant is thoroughly works-tested. |
