بررسی تصفیه‌پذیری فاضلاب کارواش با کاربرد فرایندهای ترکیبی انعقاد و UV/H2O2

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی زنجان، زنجان، ایران

2 دانش آموخته کارشناسی ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی زنجان، زنجان، ایران

چکیده

با توجه به آلاینده‌های موجود در فاضلاب کارواش‌ها، تصفیه فاضلاب ناشی از این صنعت کمک بزرگی به حفظ منابع آب سطحی و زیرزمینی است. این پژوهش با هدف تعیین کارایی سیستم انعقاد و UV/H2O2 در تصفیه فاضلاب کارواش انجام شد. فاضلاب استفاده شده در این پژوهش از خروجی نهایی کارواش خودروهای سبک با روش شست‌ و شوی دستی تهیه شد و نمونه‌برداری به‌صورت مرکب انجام شد. به‌منظور مطالعه تصفیه‌پذیری فاضلاب، ابتدا نمونه به‌منظور ته‌نشینی و کاهش TSS به‌مدت 2 ساعت به حال سکون نگه داشته شد. در مرحله اول تصفیه با انجام فرایند انعقاد با کمک دستگاه جارتست،  بهینه‌سازی pH و دز کلرورفریک انجام شد. سپس نمونه‌ها وارد راکتور UV/H2O2 شد و تحت تأثیر پرتوی فرابنفش قرار داده شد. نهایتاً مقادیر پارامترهای مورد نظر مانند COD و BOD5 در پساب خروجی از فرایند اکسیداسیون در زمان‌های تعیین شده سنجش شد. یافته‌ها نشان داد که راندمان حذف COD در فرایند انعقاد و UV/H2O2 به‌ترتیب برابر با 70 و 2/93 درصد بود. راندمان کلی سیستم تصفیه ترکیبی بر مبنای COD و BOD5 به‌ترتیب برابر با 98 و 5/97 حاصل شد و مشخص شد که سیستم پیشنهاد شده یک روش مؤثر در تصفیه فاضلاب کارواش و تأمین استانداردهای تخلیه پساب است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Treatability of Carwash Wastewater by Application of Combined Chemical Coagulation and UV/H2O2 Processes

نویسندگان [English]

  • Mehran Mohammadian Fazli 1
  • Shiva Zabihi 2
  • Ali Assadi 1
1 Assoc. prof., Department of Environmental Health Engineering, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran
2 MSc of Environmental Health Engineering, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran
چکیده [English]

In recent years, the increase in car production, population growth, urbanization and significant expansion of the use of private vehicles has led to the development of more and more carwash facilities in all cities. Regarding the carwash wastewater pollutants, treatment of such wastewater can be a big help in protecting surface and groundwater resources. The wastewater needed for this research was taken from the output of carwash using hand washing method and composite sampling. The aim of this study was to determine the efficiency of combined chemical coagulation and UV/H2O2 processes in treatment of carwash wastewater. To reduce the settleable solids, samples underwent a 2-hour settlement. Then in the first step of coagulation process, the optimum conditions for pH and the ferric chloride dose were obtained using jar test. The effluent of coagulation stage was introduced to UV/H2O2 reactor under the influence of ultraviolet radiation. Finally, required parameters such as COD and BOD5 in the effluent of oxidation process were measured at the designated times. Results showed that the COD removal efficiency of 70% and 93.2% was achieved in coagulation and UV/H2O2 process, respectively. The overall efficiency of this system based on COD and BOD5 removal was obtained as 98% and 97.5%, respectively. Overall, the recommended combined system is effective and robust to treat carwash wastewater to meet the standards of effluent discharge.

کلیدواژه‌ها [English]

  • Carwash
  • Effluent
  • Chemical Coagulation
  • UV/H2O2

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