International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
COMPARISON OF INORGANIC COAGULANTS FOR THE EFFECTIVE TREATMENT OF PULP AND PAPER MILL AND TANNERY WASTE WATER EFFLUENT 1NAVEEN
PRASATH S , 2MOHAMMAD SIRAJ ANSARI A
1P.G
Scholar, Dept. of Civil engineering, Coimbatore Institute of Technology. 2 Assistant Professor, Dept. of Civil engineering, Coimbatore Institute of Technology. ---------------------------------------------------------------------***--------------------------------------------------------------------waste management systems to reduce their Abstract: Industrialization plays an important role for environmental impact. The paper and pulp industries socio-economic development of the country. The and tannery industries are generating more quantities wastewater arising from pulp and paper mills and of waste water which forms the major reason for water tannery industries are highly polluted and has to be pollution because of the presence of several persistent treated before discharged into rivers. Coagulation– and recalcitrant substances. In this study, pulping wastes and tannery wastes have been characterized flocculation process is one of the techniques used for water and found to contain very high COD. Because of the and wastewater treatment. The present investigation was high water consumption in pulp and paper mills and carried out to study the efficiency of inorganic tannery industries, the generation of wastewater is coagulants to reduce the Chemical Oxygen Demand also enormous in quantity, which contains more COD. (COD) of pulp and paper mill and tannery wastewater. Coagulation/flocculation is a frequently applied The experiments were carried out in jar tests with process in the primary purification of industrial different inorganic coagulants (Aluminum Sulphate (Alum) wastewater, as it is efficient and simple for application. Aluminum salts and iron salts are widely used as and Poly –Aluminum Silicate –Chloride (PASiC)) with coagulants in water and wastewater treatment for the different dosages of Alum 50, 100, 150, 200, 250 mg/L removal of impurities from effluent, including colloidal and PASiC 10,15,25,35,40 and 45 mg/L, pH ranges of 5particles and dissolved organic substances. There are 9, rapid mixing at 2 min, followed by slow mixing at 40 many factors that affect the process of coagulation and rpm for 15 min with settling time of 30 min. The flocculation such as pH, alkalinity, and zeta potential, dose of coagulant and use of polyelectrolyte. But if they efficiency of inorganic coagulants with treated are controlled to the optimum ranges better removal wastewater was evaluated based on percentage removal efficiency can be achieved. Therefore the COD removal of pollutants of concern (pH and COD) in pulp and paper of paper mill waste and tannery waste is essential for mill and tannery effluent. By adding 45 mg/l of PASiC, minimizing environmental impacts. the COD removal is found to be maximum for both the In this study, coagulation-flocculation by Alum and effluents, whereas even by adding 250 mg/l of alum the PASiC are applied to pulp and paper mill industry COD removal is not that effective. The inorganic effluents and tannery industry effluent. The optimum dosage and optimum pH are studied. The COD coagulant PASiC gives better removal efficiencies with concentrations are used as evaluating parameters. The respect to COD and appears to be suitable for effluent main purpose was to define whether the application of treatment. composite coagulants can exhibit septic advantages for the physic-chemical treatment of these wastewater and to determine the appropriate coagulant and its dosage Keywords—Pulp and paper mill, tannery and optimum pH, as well as the comparison with conventional coagulants alum. wastewater, coagulation–flocculation, Alum and PASiC, MATERIALS AND METHODOLOGY COD
Effluents
Introduction Increased knowledge about the environmental impacts due to the industrial activities leads to the introduction of better techniques and more efficient © 2017, IRJET
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Impact Factor value: 5.181
The paper and pulp effluent is collected from seshasyee paper mill and the tannery effluent is collected from EKM leather industry. Tannery waste |
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