coagulant Articles

  • Coagulation, flocculation and agglomeration

    Agglomeration Agglomeration refers to the formation of more or less firmly bound primary particles by collision processes between primary particles, primary particles and agglomerates, as well as pre-existing agglomerates. The agglomeration consists of a destabilization and a transport process. The destabilization is divided into coagulation and flocculation. In general, both ...

  • Effectiveness of coagulants and coagulant aids for the removal of filter-clogging Synedra

    The occurrence of Synedra spp. in the source water of the CheongJu water treatment plant (South Korea) decreased filter run times of rapid sand filters to below 5 hours. During the filter-clogging episode, full-scale Synedra removal by coagulation with polyaluminium hydrogen chloride silicate (PAHCS), flocculation and sedimentation ranged from 20 to 70%. To reduce filter clogging, strategies ...


    By IWA Publishing

  • Effectiveness of coagulants and coagulant aids for the removal of filter-clogging Synedra

    ABSTRACTThe occurrence of Synedra spp. in the source water of the CheongJu water treatment plant (South Korea) decreased filter run times of rapid sand filters to below 5 hours. During the filter-clogging episode, full-scale Synedra removal by coagulation  with polyaluminium hydrogen chloride silicate (PAHCS), flocculation and sedimentation ranged from 20 to 70%. To reduce filter clogging, ...


    By IWA Publishing

  • Preparation, characterization and coagulation behaviour of polyferric magnesium silicate (PFMSi) coagulant

    A composite coagulant polyferric magnesium silicate (PFMSi) was synthesized by co-polymerization. The structure and morphology of PFMSi were characterized by X-ray diffraction, Fourier transform infrared spectra and scanning electron microscope microphotographs; meanwhile, the coagulation efficiency was evaluated under different ratios of Fe/Si, Mg/Si, basicity ([OH]/[M] ratio), and dosage. ...


    By IWA Publishing

  • Tuprag Metal Mining Industry – Case Study

    Project Name Tiiprag Metal Madencilik San. Ve Tic. A.$. Wastewater Treatment Plant Employer Tiiprag Metal Madencilik San. Ve Tic. A.§. Contractor Enta Miihendislik Antma Taah. San. Ve Tic. Ltd. Sti. Location of the plant U$AK/TURKEY Scope of work Industrial ...

  • Evaluation of industrial dyeing wastewater treatment with coagulants and polyelectrolyte as a coagulant aid.

    Wastewater is the major environmental issue of the textile industries besides other minor issues like solid waste, resource wastage and occupational, health and safety. Textile and dyeing mills use many kinds of artificial composite dyes and discharge large amounts of highly colored wastewater. Pretreatment, coloration and after treatment of fibers, usually require large amounts of water and ...


    By University of Tehran

  • Decolorization of dyeing wastewater and characterization of flocs during coagulation by a new composite coagulant

    A composite coagulant, polymeric aluminum ferric chloride-poly-epichlorohydrin-ethylenediamine (PAFC-EPI-ETA), was synthesized and then used for the treatment of synthetic reactive brilliant red (RBR) dyeing wastewater. Effects of (Fe + Al) to EPI-ETA mass ratio (P) on the color removal and zeta potential were investigated under different coagulant dosages and initial pHs. Experimental ...


    By IWA Publishing

  • Study on the removal of acid dyes using chitosan as a natural coagulant/coagulant aid

    Chitosan was selected as a natural coagulating agent for the removal of acid dyes (Acid Blue 292; AB292, and Acid Red 398; AR398) from dye-containing solutions. The study was organised in two phases. In phase 1, chitosan was used alone as a natural coagulant for the removal of the dyes. For this purpose, the effect of different parameters including pH, chitosan dosage and initial dye ...


    By IWA Publishing

  • Coagulation and flocculation in water and wastewater treatment

    Coagulation and flocculation are an essential part of drinking water treatment as well as wastewater treatment.  This article provides an overview of the processes and looks at the latest thinking.  Material for this article was largely taken from reference (1). Coagulation and flocculation are essential processes in various disciplines. In potable water treatment, ...


    By IWA Publishing

  • Coagulant mixing revisited: theory and practice

    Are rapid-mixing tanks with intense mixing necessary? Intense mixing applies to the coagulation mechanism of charge-neutralization of negatively-charged particles, but this is not a common coagulation method. More common is precipitation of aluminum or iron for coagulation of particles and natural organic matter, which is often called sweep-floc coagulation. Coagulation by precipitation is ...


    By IWA Publishing

  • Preparation of composite coagulant of PFM-PDMDAAC and its coagulation performance in treatment of landfill leachate

    A novel inorganic–organic composite coagulant, poly-ferric-magnesium (PFM) polydimethyldiallylammonium chloride (PDMDAAC), was prepared using FeSO4, MgSO4 and PDMDAAC as raw materials and was introduced to treat landfill leachate. The coagulation performance of the new reagent was evaluated and compared with those of other coagulants. The new reagent was characterized in terms of ...


    By IWA Publishing

  • Post-treatment of sanitary landfill leachate by coagulation–flocculation using chitosan as primary coagulant

    Chitosan was chosen as an alternative primary coagulant in a complementary coagulation–flocculation treatment of sanitary landfill leachate with the aim of removing recalcitrant organic matter. In order to optimize the process conditions, central composite design and response surface methodology were applied. To evaluate the performance of the process using chitosan, we also carried out tests ...


    By IWA Publishing

  • Application performance of a new coagulant in wastewater reuse

    Ultraviolet (UV) absorption characteristics of poly-Al-Zn-Fe (PAZF), a polymerized coagulant containing three kinds of metallic elements prepared from a galvanized-aluminum slag, was analyzed by UV-visible spectrophotometry during its polymerization process. Pollutant removal by PAZF in treating various wastewaters was investigated, in comparison with that of polyaluminum chloride (PAC). The ...


    By IWA Publishing

  • Treatment of biologically treated leachate by oxidation and coagulation

    This work aims to investigate removal efficiency of oxidation and coagulation/flocculation processes, to provide an effective method for the treatment of biologically pre-treated leachate. Leachate containing 985 mg L−1 COD was treated by using three treatment schemes, i.e. oxidation, coagulation/flocculation and the combined process of coagulation/flocculation followed by oxidation. The ...


    By IWA Publishing

  • Pretreatment of Municipal Wastewater by Enhanced Chemical Coagulation

    The efficiency of existing municipal wastewater treatment plants has been affected by the increase of incoming organic load caused by the expansions in developing countries. In the present investigation, the effect of Chemically Enhanced Primary Treatment (CEPT) process was studied on the enhancement efficiency of a municipal wastewater treatment plant in ...


    By University of Tehran

  • Multi-parameter based coagulant dosing control

    The required coagulant dosage is strongly related to the quality of raw water or wastewater. Online sensors for most quality parameters are now readily available to treatment facilities, yet remain rarely used in treatment process control. This paper presents the evaluation of an advanced coagulant dosing control system based on online measurements in full-scale processes. The popular ...


    By IWA Publishing

  • Application of recycled sludge to stabilize coagulation process

    In conventional treatment of variable quality mountain water, an inability to immediately adjust the coagulant dose to variations in water quality causes overdose or underdose of coagulant in relation to its optimal value. The results of the research showed that the reuse of post-coagulation sludge was an effective method to maintain high and stable coagulation effectiveness under both ...


    By IWA Publishing

  • Factors affecting coagulation as a pretreatment to ultrafiltration membranes

    Low pressure membranes can be effective in treating various types of water, but are subject to fouling. In this work, chemical coagulation was studied as a pretreatment to ultrafiltration (UF), with the goal of mitigating fouling while maintaining high permeate water quality. Alum and ferric chloride were evaluated, as well as two polyaluminum chloride (PACl) products of different basicities ...


    By IWA Publishing

  • Characterization and predicting DOM treatability by enhanced coagulation

    The dissolved organic matter (DOM) plays significant role in water safety due to not only the natural occurrence but also man-induced pollution. To characterize and predict DOM treatability becomes therefore a very important and hot topic. In this paper, enhanced coagulation by four typical coagulants (FeCl3, Al2(SO4)3, polyaluminum chloride (PAC) and high ...


    By IWA Publishing

  • Oxidation and coagulation of humic substances by potassium ferrate

    Ferrate (FeO42−) is believed to have a dual role in water treatment, both as oxidant and coagulant. Few studies have considered the coagulation effect in detail, mainly because of the difficulty of separating the oxidation and coagulation effects. This paper summarises some preliminary results from laboratory-based experiments that are investigating the coagulation reaction dynamically via a PDA ...


    By IWA Publishing

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