مجله آب و فاضلاب

مجله آب و فاضلاب

بررسی تأثیر استفاده از روش حرارتی- بیولوژیکی در خط برگشت لجن بر روی پارامترهای بیوسنتیکی فرایند لجن فعال و میزان لجن مازاد تولیدی

نوع مقاله : مقاله پژوهشی

نویسندگان
نعیم بنی سعید 1
افشین تکدستان 2
محبوبه چراغی 3
علی افروس 4
رضا جلیل زاده 5
1 دانشجوی دکترای مهندسی محیط‌زیست- آب و فاضلاب، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
2 استاد مرکز تحقیقات فناوری‌های زیست‌محیطی، دانشگاه علوم پزشکی جندی شاپور، اهواز، ایران
3 استادیار و مدیر گروه مهندسی محیط‌زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
4 استادیار گروه مهندسی آب، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
5 دانشیار، گروه مهندسی محیط‌زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
10.22093/wwj.2024.475559.3433
چکیده
حجم لجن تولیدی و خصوصیات آن بستگی به دو مشخصه کمّی و کیفی فاضلاب، فرایند تصفیه و نیز شرایط بهره‌برداری دارد. تولید نسبتاً بالای لجن بیولوژیکی مازاد به‌عنوان یکی از اشکالات اصلی فرایندهای هوازی مورد استفاده در تصفیه بیولوژیکی فاضلاب به حساب می‌آید. این پژوهش در تصفیه‌خانه صنعتی موجود کارخانه قند پارس شیراز با ظرفیت 5 مترمکعب در روز انجام شد. در این پژوهش، اثرات تغییرات دما در تانک آنوکسیک و در خط برگشت به‌منظور افزایش حذف بیولوژیکی لجن، کاهش لجن مازاد بیولوژیکی و همچنین تاثیرات تغییر دما بر روی پارامترهای بیوسنتیکی در سیستم لجن فعال بررسی شد. میانگین مقدار به‌دست آمده ضریب تولید بیومس (Y) یا بازده رشد در بازه 100 روزه مطالعاتی پس از رسیدن راکتور بیولوژیکی به‌حالت پایدار به‌طور میانگین در شرایط وضعیت موجود از 75/0 به 54/0 در دمای لجن برگشتی 40 درجه سلسیوس و به 38/0 در دمای 50 درجه سلسیوس و 30/0 در دمای 60 درجه سلسیوس برحسب gMLSS/gCOD رسیده است. این پژوهش نشان داد که هر چند با افزایش دمای لجن برگشتی ضریب تولید بیومس کاهش می‌یابد، ولی بر کیفیت خروجی پساب از نظر کیفیت و پارامترهای بیوسنتیکی نیز تأثیر منفی می‌گذارد. نتایج پژوهش نشان داد که بیوراکتور متعارف موجود، با تغییر در دمای لجن برگشتی در دمای 40 درجه سلسیوس به مراتب بازدهی بالاتری در موارد حذف آلاینده‌ها، محدوده متعارف پارامترهای بیوسنتیکی، کاهش میزان ضریب تولید لجن و لجن مازاد دفعی دارد.
کلیدواژه‌ها
لجن فعال
کاهش لجن مازاد
روش حرارتی بیولوژیکی
پارامترهای بیوسنتیکی
برگشت لجن

عنوان مقاله English

Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge Produced

نویسندگان English

Naeim Banisaeid 1
Afshin Takdastan 2
Mahboobeh Cheraghi 3
Ali Afrous 4
Reaz Jalilzadeh Yengejeh 5
1 PhD. Candidate, Dept. of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 Prof. of Environmental Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3 Assist. Prof., Dept. of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
4 Assist. Prof., Dept. of Water Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
5 Assoc. Prof., Dept. of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده English

The volume of produced sludge and its characteristics depend on the quantitative and qualitative characteristics of wastewater, the treatment process, and the operating conditions. Relatively high production of excess biological sludge is considered one of the main drawbacks of aerobic processes used in biological wastewater treatment. This research was conducted in the existing industrial treatment plant of Pars Shiraz sugar factory with a capacity of 5 cubic meters per day. In this research, the effects of temperature changes in the anoxic tank and return line were investigated to increase the biological removal of sludge, reduce the excess biological sludge; also, the effects of temperature changes on the biokinetics parameters in the activated sludge system were analyzed. The average values of the biomass production coefficient (Y) or growth efficiency in the 100-days study period, after the biological reactor reaches a stable state, varied from 0.75 to 0.54 at the return sludge temperature of 40 °C, decreasing to 0.38 at 50 °C and 0.30 at 60 °C in terms of (gMLSS/gCOD). This research demonstrated that while the biomass production coefficient decreases with the increasing return sludge temperature, it also has a negative impact on the quality of the effluent with respect to both quality and biokinetics parameters. The results indicated that the existing conventional bioreactor, with the return sludge temperature of 40 °C, achieves a significantly higher efficiency in removing pollutants, maintainingconventional range of biokinetics parameters, reducing the amount of sludge production coefficient and excess sludge disposal.

کلیدواژه‌ها English

Activated Sludge
Excess Sludge Reduction
Thermo-Biological Method
Biokinetic Parameters
Return Sludge
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مجله آب و فاضلاب
دوره 35، شماره 3 - شماره پیاپی 152
مرداد و شهریور 1403
صفحه 89-103