مقایسه سینتیک و ضرایب واکنش بیولوژیکی حذف کربن ، ازت و فسفردر فصول گرم و سرد سال در تصفیه خانه فاضلاب جنوب شرق استان تهران به روش لجن فعال هوادهی گسترده
محورهای موضوعی : آلودگی های محیط زیست (آب، خاک و هوا)الهه شبان جمالده 1 , امیرحسام حسنی 2 * , سیده هدی رحمتی 3
1 - دانش آموخته کارشناسی ارشد مهندسی محیط زیست – دانشکده منابع طبیعی و محیط زیست، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران.
2 - استاد گروه مهندسی محیط زیست، دانشکده منابع طبیعی و محیط زیست، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران. *(مسوول مکاتبات)
3 - استادیار گروه مهندسی محیط زیست- دانشکده منابع طبیعی و محیط زیست ، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران.
کلید واژه: ضرایب سنتیک, ضریب بهره لجن, ضریب رشد, ازت, لجن فعال گسترده, ترکیبات فسفره, ترکیبات ازته.,
چکیده مقاله :
زمینه و هدف: از مهم ترين عوامل تأثير گذار بر كارايي فرآيندهاي تصفيه و جنبه هاي اقتصادي آن انتخاب ضرايب سـينتيكي مناسب است. بـه منظور كنترل فرايندهاي تصفيه بيولوژيكي و پيش بيني و تخمين حذف مواد آلي و مـواد مغـذي و همچنـين رشد بيولوژيكي از ضرايب سـنتيكي استفاده شده است. هدف از انجام این تحقیق مقایسه سنتیک و ضرایب واکنش بیولوژیکی حذف کربن، ازت و فسفر در فصول گرم و سرد سال در تصفیه خانه فاضلاب جنوب شرق استان تهران بوده است .
روش بررسی: این مطالعه از نوع توصیفی مقطعی بوده که به مدت 6 ماه در تابستان و زمستان سال 1400 تعداد 108 نمونه با روش نمونه برداري مركب از محل ورودي و داخل تانك هوادهي و خروجی تصـفيه خانة فاضلاب انجام و پارامترهای کمی وکیفی نمونه های برداشت شده شامل دبی فاضلاب ورودي، میزان لجن برگشتی، BOD5، COD، کل مواد معلق، ازت کل، آمونیاك، فسفات کل، MLSS،MLVSS اندازه گیري شد . مقادیر ضرایب سنتیک رشد بر حسب BOD5، COD، TN و TP محاسبه گردید
یافته ها: ضرایب Y، Kd، K، KS و maxµ بر حسب BOD5به ترتیب در فصل گرم(mgBOD/mgMLSS) 11/0، (day-1)069/0،(mgBOD/mgMLSS) 055/0، (mg/l) 63/1 و(day-1) 006/0 در فصل سرد (mgBOD/mgMLSS) 11/0 ، (day-1) 055/0 ، (mgBOD/mgMLSS) 137/0 ، (mg/l) 49/14و(day-1) 015/0 و بر حسب COD به ترتیب برای فصل گرم (mgCOD/mgMLSS) 345/0، (day-1) 09/0، (mgCOD/mgMLSS) 085/0، (mg/l) 94/0 و (day-1) 03/0 و در فصل سرد (mgCOD/mgMLSS) 048/0، (day-1) 057/0، (mgCOD/mgMLSS) 161/0، (mg/l) 16/9 و (day-1) 008/0 محاسبه گردید. همچنین ضرایب KB و UMAX بر حسب TN به ترتیب در فصل گرم (g/l.day) 498/54 ، (g/l.day) 84/39 و در فصل سرد سال (g/l.day) 643/383، (g/l.day) 349/61 و بر حسب TP به ترتیب در فصل گرم (g/l.day) 592/101، (g/l.day) 923/76 و در فصل سرد (g/l.day) 985/11 ، (g/l.day) 427/10 محاسبه گردید.
بحث و نتیجه گیری: نتایج این تحقیق نشان داد که ضرایب بیولوژیکی حذف کربن، ازت و فسفر تصفیه خانه فاضلاب جنوب شرق استان تهران با مقادیر در نظر گرفته شده در مبانی طراحی تفاوت دارد و تغییرات درجه حرارت تاثیر متفاوتی برروی ضرایب بیولوژیکی حذف کربن، ازت و فسفر داشته و اثر آن از یک الگوی خاص تبعیت نمی کند.
Background and Objective: One of the most important factors affecting the efficiency of treatment processes and its economic aspects is the selection of appropriate kinetic coefficients. The kinetic coefficients have been used in order to control the processes of biological treatment and to predict and estimate the removal of organic materials and nutrients as well as biological growth. The purpose of this research is to determine the kinetics and biological reaction coefficients of removing carbon, nitrogen and phosphorus in the hot and cold seasons of the year in the wastewater treatment plant in the southeast of Tehran province.
Material and Methodology: This is a cross-sectional study that was conducted for 6 months with 108 samples using a composite sampling method from the inlet and inside the aeration tank and the outlet of the wastewater treatment plant, and the quantitative and qualitative parameters of the collected samples included The inflow rate sewage, amount of returned sludge, BOD5, COD, Total suspended solids, total nitrogen, total ammonia, total phosphate, MLSS, MLVSS were measured. The values of the kinetic coefficients in terms of BOD5, COD, TN and TP were calculated
Findings: Y, Kd, K, KS and µmax coefficients in terms of BOD5 respectively in summer season , 0.11 (mgBOD/mgMLSS), 0.069 (day-1), 0.055 (mgBOD/mgMLSS), 1.63 (mg/ l) and 0.006 (day-1) in the winter season 0.11 (mgBOD/mgMLSS), 0.055 (day-1), 0.137 (mgBOD/mgMLSS),14.49 (mg/l) and 0.015 (day-1) and in terms of COD respectively for the summer season 0.345 (mgCOD/mgMLSS), 0.09 (day-1), 0.085 (mgCOD/mgMLSS), 0.94 (mg/l ) and 0.03 (day-1) and in the winter season 0.048 (mgCOD/mgMLSS), 0.057 (day-1), 0.161 (mgCOD/mgMLSS), 9.16 (mg/l) and 0.008 (day-1) were calculated. Also, KB and UMAX coefficients in terms of TN are respectively in the hot season 54/498 (g/l.day), 39/84 (mg/l.day) and in the cold season 383/643 (g/l.day), 61/349 (mg/l.day) and according to TP respectively in hot season 101/592 (g/l.day), 76/923 (mg/l.day) and in cold season 11/985 (g/l.day), 10/427 (mg/l.day) was calculated.
Discussion and Conclusion: The results of this research showed that the biological coefficients of carbon, nitrogen and phosphorus removal in the wastewater treatment plant in the southeast of Tehran province are different from the values considered in the design principles, and temperature changes have a different effect on the biological coefficients of carbon, nitrogen and phosphorus removal and its effect does not follow a specific pattern.
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