silt density index Articles

  • 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

  • MSC a biologically oriented approach

    The effective filtration of source water is a prerequisite for water treatment in numerous industrial and agricultural applications. Obviously the purpose of filtration is to remove particles or “solids” from the inflowing water stream. Usually filtration efficiency is measured by various standard tests such as turbidity (NTU), total suspended solids (TSS), silt density index (SDI) and particle ...

  • 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

  • The safe use of cationic flocculants with reverse osmosis membranes

    Abstract Flocculants are used in combination with coagulants to agglomerate suspended particles for removal by filtration. This technique is used extensively in all types of surface waters to reduce the silt density index (SDI) and minimise membrane fouling. Although organic cationic flocculants are particularly effective, their widespread use in membrane applications is limited ...

  • Drinking Water Treatment Municipality of Sainte-Geneviève de Batiscan, Quebec

    A number of Quebec municipalities are confronted with feedwater problems of a bacteriological or physicochemical nature hardness, manganese, iron, dissolved solids) in the production of their drinking water. In many cases, these water sources do not meet government quality standards for drinking water. Membrane filtration preceded by the appropriate pretreatments can be a solution. Piloting ...


    By H2O Innovation

  • UF Membrane Technology

    UF Membrane Technology Ultrafiltration (UF) is a variety of membrane filtration in which forces, such as pressure or concentration gradients, cause separation through the semi-permeable membrane. High molecular weight suspended solids and solutes remain in the so-called retentate while water and low molecular weight solutes pass through the membrane in the permeate (filtrate). The pore size of ...


    By Jiangsu Jiuwu Hi-tech Co

  • Microfiltration vs Ultrafiltration Processes: What is the Difference?

    Microfiltration (MF) and ultrafiltration (UF) are both processes by which a contaminated liquid is passed through a semipermeable membrane that removes solids too large to fit through the membrane’s pore size, yielding a purified liquid stream. To what degree the stream is purified depends on the contaminants present and the pore size of the membrane. MF and UF are generally ...


    By SAMCO Technologies, Inc.

  • Recovering flows and pressures to start-up parameters - Case tudy

    Introduction A customer in Camarillo, California approached Avista Technologies to help restore baseline flows on a recently commissioned ultrafiltration (UF) system using HYDRAcap 60 membranes. The plant is located in a hot house, with its water source drawn from recycled hydroponics irrigation, also known as tail water. The system experienced flow loss shortly after start-up. ...


    By Avista Technologies, Inc.

  • How Much Do Microfiltration and Ultrafiltration Membrane Systems Cost?

    Microfiltration and ultrafiltration (MF/UF) membrane systems are used in a variety of processes and applications. They can help facilities treat boiler feed water, separate out contaminated waste to acceptable effluent standards, and manufacture safe food and/or beverages, to name a few. If your facility might require MF/UF membrane system technology, you are likely ...


    By SAMCO Technologies, Inc.

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