chemical-free reverse osmosis plant Articles

  • Innovative seawater intake for reverse osmosis desalination plants

    Seawater desalination plants typically consist of four major unit operations: seawater intake, pretreatment, Reverse Osmosis (RO) stage, and posttreatment and brine discharge. The best way is to go through vertical beach wells, but the increase of the production capacity of the plants built in recent years makes open intake the only solution. These open ocean intakes draw seawater through the ...


    By Inderscience Publishers

  • Reverse osmosis system to reclaim wastewater

    The Facility Pragati Power Corporation Limited, formerly Delhi Vidyut Board (DVB), was formed by the Government of National Capital Territory (NCT) of Delhi in 1997 for the purpose of generation and distribution of power to the entire area of NCT of Delhi. To bridge the gap between demand and supply and to have reliable power supply to the capital city of Delhi, a 330 MW combined cycle Gas ...

  • Reverse Osmosis Technology - Kuriverter Rc.

    Summary Applications using Reverse Osmosis membrane technologies are everywhere in our lives – from tiny under counter units polishing our drinking water through industrial units preparing water for processes or purifying effluents for reuse and massive seawater desalination plants producing thousands of m³ of drinking and irrigation water every day. The membranes used in this ...


    By Kurita

  • Experiences with the conventional pretreatment system in the seawater reverse osmosis plant at Kalpakkam

    A 1800 m³/day Seawater Reverse Osmosis (SWRO) plant was commissioned in October 2002 at Kalpakkam, India, as part of the Nuclear Desalination Demonstration Project (NDDP). The conventional pretreatment scheme was adopted consisting of a lamella clarifier, pressurised sand filter, activated carbon filter and cartridge filter. The dosing of pretreatment chemicals, ferrous sulphate and ...


    By Inderscience Publishers

  • Fouling and cleaning of seawater reverse osmosis membranes in Kalpakkam nuclear desalination plant

    A seawater reverse osmosis plant of 1800 m³/day capacity is part of the 6300 ³/day capacity nuclear desalination demonstration project at Kalpakkam. The plant was commissioned in October 2002 and is in continuous operation. This paper deals with types of foulants, membrane cleaning procedures and the improvement in the reverse osmosis system after cleaning. This paper also describes the analysis ...


    By Inderscience Publishers

  • Optimizing scale inhibition costs in reverse osmosis desalination plants

    Over the last few decades, advancements in technology and engineering design have allowed for the construction of reverse osmosis (RO) plants with increased production capacities that could operate at reasonable energy costs. Yet the portion of the operating cost related to consumable scale inhibition chemicals has not changed dramatically due to the disregard by the water treatment community for ...

  • Assessment of an ultrafiltration pre-treatment system for a seawater reverse osmosis plant

    The seawater reverse osmosis system requires extensive pre-treatment in order to ensure reliable performance. The conventional pre-treatment system involves dosing of chemicals, which requires frequent monitoring of raw water quality, and also involves adjusting the dosage. Besides being cumbersome, there is a lot of time lag involved in carrying out these measures. This calls for pre-treatment ...


    By Inderscience Publishers

  • Reverse Osmosis Technology – KURIVERTER RC - Case Study

    Summary Applications using Reverse Osmosis membrane technologies are everywhere in our lives – from tiny under counter units polishing our drinking water through industrial units preparing water for processes or purifying effluents for reuse and massive seawater desalination plants producing thousands of m³ of drinking and irrigation water every day. The membranes used in this ...


    By Kurita

  • Reverse Osmosis and Electrodeionization Alternate to Service DI

    Electrodeionization (EDI) is a chemical free water treatment technology that eliminates the need for off line chemical regeneration. EDI has gone from an unproven and unknown commodity to one that has revolutionized the industry in the past 20 years. Much has been written and discussed about the use of EDI systems for industrial applications such as power plants and semiconductors, where flows ...


    By Agape Water Solutions, Inc.

  • Influence of feed quality on seawater reverse osmosis performance

    The trouble-free operation of a Reverse Osmosis (RO) plant relies on the quality of the treated feed water, which highlights the need for optimisation of the pre-treatment steps. The quality of raw seawater varies with time in terms of suspended and colloidal load, along with the dissolved salt content. In a conventional pre-treatment scheme, consisting of clarification and particulate and micron ...


    By Inderscience Publishers

  • Innovations in the inhibition of reverse osmosis membrane scaling and fouling

    Abstract: Scaling and fouling of membranes is an on-going performance issue for most plants. There are continual improvements in membrane technology and plant design which increase efficiency, water quality and utilise different raw water supplies to produce clean pure water. This presentation outlines innovations in laboratory services and speciality chemicals designed to inhibit membrane ...

  • Reverse osmosis system reclaims 86% wastewater in singapore

    The Problem Singapore, a small island-state with few natural resources, currently imports about half of the country’s potable water supply from neighboring Malaysia and efforts are being made by the Singapore government o reduce dependence on imports. The increased success of recycling and reuse of waste water in Singapore is a key strategy to Singapore’s increased self ...

  • A study of the physical and chemical damage on reverse osmosis membranes detected by autopsies

    Abstract Water treatment by reverse osmosis technology has as main aim to reject the maximum percentage of ions from raw water, giving as much treated water flow as possible. When there is a loss in these two parameters performance, it is essential to find the source of the failure, in order to use the necessary tools for its recovery. At this point, membrane autopsies are a very ...

  • Nutrient removal in reverse osmosis concentrates using a biological aerated filter

    The aim of this study is to employ a biological aerated filter (BAF) in the treatment of reverse osmosis (RO) concentrate received from reuse of treatment plant wastewater. Furthermore, the influence of chemical oxygen demand (COD)/N ratio on the nutrient removal was analyzed to find the detailed removal pathways of nutrients. The result was found to be high efficiency for biochemical oxygen ...


    By IWA Publishing

  • Short- and long-term fouling characteristics of reverse osmosis membrane at full scale leachate treatment plant

    This research is focused on characterizing the foulants on a reverse osmosis (RO) membrane taken from a full-scale leachate treatment plant in Thailand. The system consists of a physico-chemical pre-treatment unit and RO system and has been in operation for 2 years. Ferric chloride (FeCl3) was added to the open-jet sedimentation tank at 2.0–2.5 g/l dosage for chemical coagulation. The supernatant ...


    By IWA Publishing

  • Inhibitors for CaCo3-scaling in reverse osmosis-plants - influence of suspended matter on membrane clogging

    Abstract Calcium carbonate (CaCO3) is the most common source of mineral scaling in reverse osmosis plants, and it is a standard approach to add so-called anti-scalants to avoid membrane blocking. Although anti-scalants are used for many years, it remains a challenge to determine the most effective anti-scalant and its necessary dosage for a given water. The reason why, is the ...


    By Kurita

  • Innovations in the inhibition and cleaning of reverse osmosis mebrane scaling and fouling - Case Study

    Abstract: Scaling and fouling of membranes are an on-going performance issue for most plants This presentation outlines innovations in speciality chemicals designed to inhibit membrane scaling and fouling and to clean membranes where deposition has occurred. High phosphate waste water reuse RO plant – There is an increasing trend to treat recycled waste water and use ...

  • Preservation of reverse osmosis membranes with non oxidizing biocides – comparison with SMBS

    Sodium metabisulphite (SMBS) is the current standard preservation chemical used in RO plants during shut down. It is a cheap and efficient preservative, but its tendency to oxidize easily has several drawbacks. The use of a non-oxidizing biocide instead could solve some of the issues currently seen with the SMBS, but little has been reported about membrane compatibility and preservation ...


    By IWA Publishing

  • Reverse Osmosis Water Treatment Plant for Occidental Mukhaizna L.L.C. – Oman case study

    Corodex Industries has executed a Reverse Osmosis Water Treatment plant (WTP) as part of temporary facility that includes physical and chemical processes in order to attain the required product water specifications that comply with the Boiler Feed Water (BFW) requirements for Occidental Mukhaizna LLC-Oman. The system guarantees a product water quality and the process deploys a RO WTP as a main ...


    By Concorde – Corodex Group

  • Preparation of thin-film composite polyamide reverse osmosis membranes

    Thin-Film Composite (TFC) polyamide membranes in spiral wound configuration are widely used in seawater desalting plants worldwide because of their superior solute-rejecting properties and attractive water permeation rates. TFC polyamide membranes are three layered membranes, prepared in two stages wherein conventional phase separation and interfacial polymerisation techniques are combined to ...


    By Inderscience Publishers

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