IJE TRANSACTIONS B: Applications Vol. 31, No. 8 (August 2018) 1196-1204    Article in Press

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H. Sarkheil, Y. Azimi and S. Rahbari
( Received: January 14, 2018 – Accepted in Revised Form: March 09, 2018 )

Abstract    Utilization of water in different parts of industrial life cycles brings a huge concern on environmental water and wastewater pollutions. In this research, environmental quality assessment of wastewater is studied using fuzzy logic. Fuzzy appliance is due to existance of statistical considerations (including standard deviations), various uncertainties, non-linearity and complexity of functions. A Mamdani fuzzy inference system (FIS) is developed for prediction of a fuzzy wastewater quality index (FWWQI) where four variables of Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS) and pH are considered. To assess the performance of the proposed index under actual conditions, water quality data of refineries at South Pars Special Economic and Energy Zone, Iran, are employed in the time interval from 2011 to 2014. Findings of this research indicated that only BOD and COD were the dominant pollutants for about 66% and 34% of analyzed time, respectively, which exceeds the standards. Moreover, the time pattern for the output indices represents that FWWQI varied from "Moderate" in 2011 to "Good" in 2014. In addition, comparison of the FWWQI results with two conventional classic methodologies indicated that the proposed fuzzy method well covers the two classic methodologies. Finally, it is noticed that all three proposed WQIs exhibit correspondingly "Good" level in the year 2014. Thus, the time pattern for the parameters and indices express continual improvement as outcome of ISO 14001 and HSE-MS.


Keywords    Water Quality Index WQI, Wastewater, Fuzzy inference, Water Pollutants


چکیده    استفاده از آب در صنایعمختلف امری اجتناب ناپذیر بوده و می­تواند موجب آلودگی­های زیست محیطی شود. آلودگی پساب­های صنعتی تاثیرات نامطلوبی بر بهداشت عمومی، سامانه­های اکولوژیکی و منابع آب­های سطحی و زیرسطحی دارد. بدین منظور، نظام­های مدیریت زیست محیطیEMSs و نظام مدیریتیکپارچهHSE-MS از روش­های کارآمد ارزیابی­های زیست محیطی و ارزیابی ریسک زیست محیطی بهره می­جویند. در این پژوهش به مطالعه ارزیابی کیفیت زیست محیطی پساب با استفاده از سامانه استنتاج فازی ممدانی پرداخته شده است. متغیرهای ورودی شامل: BOD، COD، TSS و pH بوده و متغیر خروجی شاخص فازی کیفیت پساب FWWQI تعیریف شده است. متغیرها در بازه [0, 100] در پنج دسته تابع عضویت ذوزنقه­ای با عناوین: 1-کیفیت بسیار خوب، 2-کیفیت خوب، 3-کیفیت متوسط، 4-کیفیت بد و 5-کیفیت خطرناک طبقه بندی شده­اند. تعداد قوانین فازی 24 مورد تعیین شده­اند. روش­های کلاسیک:1- شاخص کیفیت آب جهانیGWQI و 2-شاخص وزنی تجمعی کیفیت آب AWWQI جهت مقایسه کارآمدی روش فازی پیشنهادی، مطالعه گردیده­اند. مطالعه موردی مربوط به منطقه ویژه اقتصادی انرژی پارس در بازه زمانی سال میلادی 2011 الی 2014 می­باشد. مقایسه روش شناسی فازی پیشنهادی و روش­های کلاسیک گویای این مطلب است که مقادیر سالیانهFWWQI در مقایسه با GWQI دارای خطای نسبی +13.05% بوده در حالی که مقادیر سالیانهFWWQI در مقایسه با AWWQI دارای خطای نسبی -3.33% برآوردشده­اند. بر اساس روش شناسی­ها، روش فازی به روش وزنی تجمعی نزدیکی بیشتری داشته است. در مطالعه موردی، تنها BOD و COD از محدوده استاندارد خارج گردیده­اند به طوری که BOD با 66% و COD با 34% انحراف از حالت استاندارد به عنوان آلاینده­های محدود کننده تعیین گردیده­اند. بر اساس مطالعه الگوی زمانی شاخص­های خروجی؛ شاخص فازی از سطح کیفیت متوسط در سال 2011 به سطح خوب در سال 2014، شاخص جهانی از سطح مرزیmarginal در 2011 به سطح خوب در 2014 و شاخص وزنی تجمعی از سطح خوب در 2011 به سطح خوب در 2014 بهبود یافته­اند. قابل توضیح است که هر سه مورد شاخص در سال 2014 نمودار سطح کیفیت خوب می­باشند که از جمله مهم ترین دستاوردهای استقرار نظام های مدیریتیISO 14001 و HSE-MS می­باشد.


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