coagulant treatment Articles
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Total photosynthetic pigments in addition to turbidity during the selection of coagulant treatments: a drinking water treatment perspective
Total photosynthetic pigments (TPP) or chlorophyll-a analysis can be useful in selecting coagulant treatments that will improve phytoplankton removal and reduce treatment costs. The objectives of this study were to compare the efficacy of phytoplankton and turbidity removal when using TPP and turbidity as indicator parameters of appropriate coagulant treatments as well as to evaluate the cost ...
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Influence of coagulant/lime dosing sequence on treatment of soft humic waters
The influence of dosing sequence of lime and alum as a coagulant in the treatment of soft humic waters (requiring pre-alkalinisation of raw water) was studied. The experiments show that the traditional dosing order, i.e. pre-alkalinisation first and coagulant second, might give worse results in comparison with the reversed order, i.e. coagulant dosing followed by pre-alkalinisation. The ...
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Kinetic study of toxic pollutants decomposition by ozone in landfill leachate using a numerical adaptive method
This study describes a new method to perform the kinetic study of toxic pollutants decomposition by ozone in landfill leachate using a novel numerical adaptive method based on the classical least square method. The leachate was obtained from the Mexico City waste sanitary landfill (Bordo Poniente) and was treated by ozonation after a coagulation treatment with Fe2(SO4)3. For the partial ...
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Color removal from industrial wastewater with a novel coagulant flocculant formulation
Abstract: Chemically enhanced wastewater treatment is attracting substantial interest among the currently employed chemical unit processes in wastewater treatment. Coagulation-flocculation has received considerable attention for yielding high pollutant removal, especially color removal. This investigation presents a novel formulation of coagulation-flocculation for color removal from industrial ...
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8 Painful Points of Chemical Coagulation Treatment Plants
Water treatment has evolved tremendously over several decades. What used to be as simple as boiling water or filtering through sand has become an entire industry in its own right. Many treatment processes are based almost entirely around chemical processes that can be quite complex on occasion. It makes sense. Some of the pollutants in wastewater are compounds that are more difficult to deal ...
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Coagulation pretreatment of highly concentrated acrylonitrile wastewater from petrochemical plants
Acrylonitrile (AN) wastewater is a heavily polluted and a likely hazardous liquid that is generated during the production of AN. Several chemical methods for the pretreatment of AN wastewater are available in laboratory scale. However, the harsh reaction conditions and high operational cost make these methods undesirable. Until now, four-effect evaporation is the only pretreatment method used ...
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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 ...
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Treatment of actual metalworking wastewaters by coagulation combined with electrochemical oxidation
The technical and economical viability of physico-chemical treatment followed by electrochemical oxidation of two actual wastes produced in a metalworking industry has been studied. The physico-chemical process was found to be able to achieve the breakdown of the emulsions in the treatment of both effluents, although it requires a complementary treatment to deal with the soluble organic matter. ...
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Treatment of oilfield produced water with electrocoagulation: improving the process performance by using pulse current
The main aim of this study is to investigate the technical and economic feasibility of the pulse electrocoagulation (PE) process on the treatment of oilfield alkali/surfactant/polymer flooding produced water. By using an Fe electrode, the performance of the PE process was analyzed in terms of operating parameters such as pulse duty cycle, current density, pulse frequency, electrode distance, ...
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Soil aquifer treatment using advanced primary effluent
Soil aquifer treatment (SAT) using primary effluent (PE) is an attractive option for wastewater treatment and reuse in many developing countries with no or minimal wastewater treatment. One of the main limitations of SAT of PE is rapid clogging of the infiltration basin due to high suspended solid concentrations. Some pre-treatment of PE before infiltration is likely to reduce this limitation, ...
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Characterization of dissolved organic matter in the secondary effluent of pulp and paper mill wastewater before and after coagulation treatment
Meeting the regulatory discharge standards for pulp and paper mill wastewater has become ever more difficult because of its recalcitrant and colored dissolved organic matter (DOM). In this study, the variation of DOM from the secondary effluent of pulp and paper mill wastewater before and after coagulation was investigated based on hydrophobicity/hydrophilicity, apparent molecular weight (MW) ...
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Rheological and electrical properties used to investigate the coagulation process during sludge treatment
Analyses of rheological properties and electrical conductivity (σdc) at direct current have been employed in order to investigate the effects of calcium oxide on the coagulation process during sludge treatment in the textile industry. In this context, rheological and electrical measurements were performed on five samples – one that contained raw sludge and the other four that were prepared ...
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Assessment of the value of NOM treatment processes based on a matter-element model
Research into natural organic matter (NOM) removal in drinking water treatment processes is mostly independent, distributed, disconnected and unable to meet the needs of technology application; therefore, an assessment of the value of NOM treatment processes is necessary. In this paper, a hybrid evaluation model based on rough set theory and a matter-element model was used to evaluate the ...
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Pulse electro-coagulation application in treating dibutyl phthalate wastewater
Pulse electro-coagulation (PEC) was applied to treat plastic factory wastewater in this study. One representative plasticizer molecule was chosen for the synthetic wastewater: dibutyl phthalate (DBP). Experiments demonstrated that PEC exhibits superior economic efficiency and removal efficiency compared to traditional electro-coagulation in wastewater treatment. Experimental data also ...
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7 Common Pitfalls when you choose a Chemical Coagulation Water Treatment System to Treat Your Water
Pretreatment processes in water treatment systems are often crucial to maintaining efficiency and longevity of the downstream equipment, such as membrane filtration. Many systems incorporate a coagulation step that will encourage small suspended solids to aggregate and fall out of solution. By eliminating the larger particles in the solution, filtration membranes won’t foul, tear or clog ...
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Sequential treatment of an old-landfill leachate
This work investigates the performance of combined techniques applied to the treatment of an old-landfill leachate, which presents high salinity, low biodegradability (BOD5/COD around 0.05) and high ammonia concentration. Three sequences of processes were employed, including coagulation/flocculation, chemical oxidation, biological treatment and ammonia stripping. The association of ...
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Coagulation Water Treatment vs. Electrocoagulation Treatment
There are many ways to treat water, and one of the most common tactics is coagulation. This method provides clean, safe water and is typically used alongside other standard processes like sedimentation, disinfection, and filtration. All of these methods assist in removing contaminants from water. However, while coagulation water treatment is a good conventional option, a better solution exists ...
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Comparing Rubber Band Ligation and Infrared Coagulation for Hemorrhoid Treatment
Medical experts estimate that hemorrhoids occur in about 50 percent of the population by age 50. This means that millions experience the daily discomfort and pain of this condition. Hemorrhoids occur for a wide range of reasons – constipation, straining at bowel movements, heavy lifting and often even pregnancy. These activities may lead to increased pressure within the hemorrhoidal veins ...
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A parametric study of alum recovery from water treatment sludge
Alum recovery from water treatment sludge is a promising technique applied to decrease usage of fresh coagulants in the water treatment industry. In addition, alum recovery reduces sludge volume for easy handling. The undertaken work investigated the parametric conditions for alum recovery procedure by acidification. The results show that alum recovery reaches up to 69.03%, and the reduction ...
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Evaluation of trihalomethane formation in treatment of water containing
Microcystis aeruginosa using chitosan as coagulantThere are few studies that evaluate the application of chitosan in the treatment of eutrophic waters and its contribution to disinfection by-product formation. Thus, this study evaluated the use of chitosan as coagulant in the treatment of lake water spiked, or not, with Microcystis aeruginosa cells, as well as the formation of trihalomethanes (THM) by chlorine oxidation. Coagulant doses were ...
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