Selection of Optimized Coagulator for Pre-treatment of Mazandran Textile Wastewater Using Jar Test and Analytic Hierarchy Process (AHP)

Subject Areas : environmental management

Gholamreza Assadollah Fardi ¹ , Hossein Zangooei ² , Mostafa Davoodi ³ , Saber Moradinejad ⁴

1 - Associate Professor of Civil Engineering, Department of Engineering, Kharazmi Uneversity, Tehran
2 - Graduate Student, Department of Civil Engineering, Kharazmi Uneversity, Tehran
3 - Graduate Student, Department of Civil Engineering, Kharazmi Uneversity, Tehran
4 - - Graduate Student, Department of Civil Engineering, Kharazmi Uneversity, Tehran

Received: 2013-07-31 Accepted : 2014-11-22 Published : 2014-12-22

Keywords: Mazandran Textile factory, Jar test,

Abstract :

Introduction: Textile industry is of those industries whose wastewater includes different pollutants. Therefore, conventional treatments are not able to treat all of the textile wastewater pollutants. Chemical coagulation may be suitable for the removal of Total Suspended Solids (TSS) as a pre- treatment. Material and Methods: In this study, after monitoring the wastewater from Mazandaran textile factory, which is currently discharged into the river without treatment, Jar test, alum, calcium oxide, ferrous sulfate, ferrous chloride and barium chloride were applied to investigate the maximum amount of TSS removal with the change of pH. Results: In addition to the type of coagulator, other parameters such as coagulation cost, sensitivity to pH change, the amount of sludge generation and side effects are effective on selection of coagulation. Hence, to select optimally, AHP was applied using Expert choice software considering the important effective parameters in decision making. Moreover, the score of each parameter was used considering the related experts’ opinion included in the questionnaires. Discussion: The results of Jar test and AHP indicated that calcium oxide was the best choice for reduction TSS in thye wastewater from Mazandaran textile factory. Also the Jar test results indicated 70% dye removal and 30% COD removal  using calcium oxide as a coagulant.  

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