sand filtration process Articles

  • Impact of polymeric membrane filtration of oil sands process water on organic compounds quantification

    The interaction between organic fractions in oil sands process-affected water (OSPW) and three polymeric membranes with varying hydrophilicity (nylon, polyvinylidene fluoride and polytetrafluoroethylene) at different pHs was studied to evaluate the impact of filtration on the quantification of acid-extractable fraction (AEF) and naphthenic acids (NAs). Four functional groups predominated in OSPW ...


    By IWA Publishing

  • Biological aspects of slow sand filtration: past, present and future

    For over 200 years, slow sand filtration (SSF) has been an effective means of treating water for the control of microbiological contaminants in both small and large community water supplies. However, such systems lost popularity to rapid sand filters mainly due to smaller land requirements and less sensitivity to water quality variations. SSF is still a particularly attractive process because its ...


    By IWA Publishing

  • Homogeneous, heterogeneous and biological oxidation of iron(II) in rapid sand filtration

    Homogeneous, heterogeneous and biological oxidation may precipitate iron(II) as iron(III) hydroxides. In this paper we evaluate the conditions under which each of these processes is dominant in rapid sand filtration (RSF). It is demonstrated that in the presence of iron(III) hydroxide precipitates homogeneous oxidation is negligible compared with heterogeneous oxidation. As soon as iron oxidizing ...


    By IWA Publishing

  • Green Sand Filters, Chile

    INTRODUCTION In August 2013, Pure Aqua, Inc. manufactured and supplied Green Sand Filters to a major company in Chile to lower the manganese and iron level in well water. The system came complete with tank, top mounted valves, and high quality green sand media. The system was designed to produce 24 GPM. Since the initial startup, ...


    By Pure Aqua, Inc.

  • Contributions of homogeneous, heterogeneous and biological iron(II) oxidation in aeration and rapid sand filtration (RSF) in field sites

    In groundwater treatment, after aeration, iron(II) is precipitated in rapid sand filtration (RSF) by homogeneous, heterogeneous and biological oxidation. The contribution of homogeneous iron(II) oxidation may be calculated from equations and constants available in the literature. Heterogeneous iron(II) oxidation produces hydrous ferric oxides coated filter sand, resulting in a growing filter ...


    By IWA Publishing

  • Removal of arsenic from contaminated groundwater with application of iron electrodissolution, aeration and sand filtration

    The results from a new water treatment system for arsenic removal are presented. The technology is based on the employment of an electrolytic iron dissolution and efficient aeration procedure prior to sand filtration. The treatment was introduced and investigated in a pilot scale plant and full scale waterworks. The pilot scale results showed the potential for efficient arsenic removal from ...


    By IWA Publishing

  • Low cost and sustainable surface water purification methods using Moringa seeds and scallop powder followed by bio-sand filtration

    A simple and inexpensive water purification method was developed using natural coagulant (Moringa seed powder) and antibacterial agents (scallop powder) followed by bio-sand filtration. In this study, surface water from different sources (e.g. pond, canal, lake and river) treated with combined Moringa seed powder, and scallop powder (MOSP) at a ratio of 2:1 for 10 minutes ...


    By IWA Publishing

  • Pilot study of oilfield wastewater treatment by micro-flocculation filtration process

    In order to meet the latest Environmental Protection Law of China on wastewater discharge standards, this paper studied a pilot-scale micro-flocculation filtration pretreatment process for the treatment of oilfield wastewater. The experiment showed that the removal rate of oil and suspended solids (SS) respectively increased from 91.52% to 95.38% and from 66.42% to 97.19%. After the treatment ...


    By IWA Publishing

  • Problematic algae in the sedimentation and filtration process of water treatment plants

    Problematic algae, species that do not settle or are not easily removed by water treatment processes, are common in many water treatment plants (WTPs). We recorded algae in the water that overflowed from sedimentation basins (SBs) to filtration basins of WTPs in South Korea. Diatoms were common and other algae were not discernible in the flocs. Our field observation indicated that long and ...


    By IWA Publishing

  • Understanding Crossflow Filtration

    There's a lot of attention being given to water availability and purity, with good reason. Obtaining enough water is a struggle in some areas. In others, water is tainted with contaminants. It is therefore predictable that regulations and economics will force careful water treatment and stress water re-use. Fortunately, there are water treatment methods that can help you meet the water quality ...


  • An antimicrobial polycationic sand filter for water disinfection

    A new sand filtration water disinfection technology is developed which relies on the antimicrobial properties of hydrophobic polycations (N-hexylated polyethylenimine) covalently attached to the sand's surface. The efficacy of the filter disinfection process was evaluated both with water spiked with E. coli and with real aqueous effluent from a wastewater treatment plant. For the ...


    By IWA Publishing

  • Comparison of the water purification efficiency of two different flocculation-sediment-filtration (FSF) processes in Chaohu Lake in China

    A novel biofilter (BF) with the potential to improve pollutant removal when used as a substitute for sand filters in water purification processes is presented. To investigate BF's pollutant removal performance, a flocculation-sediment-biofiltration (FSBF) process was compared with a flocculation-sediment-sand filtration (FSSF) process on a lab scale, with water collected from Chaohu Lake. The ...


    By IWA Publishing

  • A pilot plant study of the processes of filtration and adsorption of drinking water through granular activated carbons: a comparative study

    This study reports a procedure for the evaluation and comparison of the adsorption and filtration capacities of commercial activated carbons in the treatment of drinking water and the design and operation of a pilot plant to simulate the behavior of fast open filters made of granular activated carbon. The milestone of this experimental work was to determine the adsorption and filtration ...


    By IWA Publishing

  • Removal of geosmin and 2-methylisoborneol through biologically active sand filters

    The removal of taste and odour compounds from drinking water is a constant challenge to water authorities. Although adverse odours do not present a risk to human health, their presence often leads to a misconception that the water is unsafe for drinking. 2-Methylisoborneol (MIB) and geosmin are the most common causes of earthy/musty odour, and are not easily removed by conventional treatment ...


    By Inderscience Publishers

  • Use of bauxite for enhanced removal of bacteria in slow sand filters

    Slow sand filtration (SSF) is a well-known process for drinking water treatment and is widely used for the production of biologically stable drinking water and particle removal. The removal process of particles and microorganisms is highly dependent on the buildup of the schmutzdecke at the filter surface. During the ripening period and especially for cold waters, the buildup of the ...


    By IWA Publishing

  • Desert Sands MDWCA #4, New Mexico - Case Study

    In August 2008, AdEdge Water Technologies was contacted by the engineering firm Bohannan Huston to design, supply and start up an arsenic and iron removal system for Desert Sands MDWCA Well #4 in Anthony, New Mexico. The water chemistry had an arsenic level of 17 to 20 ppb and a naturally occurring iron level of 1 mg/L that will facilitate co-precipitation and removal of arsenic. AdEdge was ...

  • How to Choose the Right Biological Water Filtration System

    There are many different biological treatments of water available. They’re all similar in a number of ways, but share key differences in the specific ways the water is filtered. This article is an informative breakdown of all the different biological water treatment systems that are available and how they ...

  • Collini metal processing plant

    Introduction The submerged membrane bioreactor plant at Collini galvanic industries in the West of Austria is a fine example of process optimization in a complex industrial environment. The plant is owned and operated by Collini and is now in its 3rd year treating wastewater from a metal processing facility. It is sited in an industrial estate and discharges into a small waterway in an ...


    By Kubota Membrane Europe Ltd.

  • Hybrid filtration method for pre-treatment of stormwater

    In this study the hybrid filtration process (combining fibre filter with deep bed dual media filtration) was investigated as pre-treatment to stormwater. This process was investigated in-terms of reduction in turbidity, dissolved organic carbon (DOC), colour, headloss development across the filters, suspended solids removal, organic matter removal, nutrients and heavy matter (such as iron, ...


    By IWA Publishing

  • Bypass filtration in open circulating cooling water systems

    An open circulating cooling system is a method to remove process heat and is applied frequently for industrial purposes. In these systems heat is removed by evaporation of water to the surpassing air in the cooling tower. However there are some environmental disadvantages such as addition of chemicals to prevent the cooling water system from microbial growth and corrosion. The application of ...


    By Paques B.V.

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