fa بررسی ارتباط بین قلیائیت فاضلاب ورودی و عملکرد واحد بافل‌دار بی هوازی تصفیه خانه فاضلاب و ارائه راهکار جهت افزایش میزان قلیائیت فاضلاب ورودی فاضلاب wastewater پژوهشي Research <div style="text-align: justify;"><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">زمینه و هدف</span></span></strong><strong><span dir="LTR"><span style="font-family:Times New Roman,serif;">:</span></span></strong> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">با توجه به اهمیت قلیائیت در تنظیم </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">pH</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> و نقش بافری آن، در این مطالعه، تاثیر قلیائیت فاضلاب ورودی بر کارایی واحد بافل‌دار بی&shy; هوازی و تعیین بهترین ماده شیمیایی برای تامین قلیائیت فاضلاب مورد بررسی قرار گرفت. </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;"></span></span><br> <strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">روش بررسی:</span></span></strong> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">این مطالعه جهت تعیین رابطه بین قلیائیت فاضلاب ورودی و راندمان حذف پارامترهای</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">COD </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">، </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">BOD₅</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> و </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">TSS</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> در تصفیه خانه انجام شد. </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">برای تعیین ماده قلیای بهینه جهت تامین قلیائیت سیستم&shy; های بی&shy; هوازی، </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">چهار</span></span> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">ماده شیمیایی رایج </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">NaOH</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">، </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">Ca(OH)₂</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">، </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">Na₂CO₃</span></span> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">و </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">MgO</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> انتخاب گردید و با استفاده از جارتست و روش طراحی </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">آزمایشات یک فاکتور در زمان (</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">One Factor At Time (OFAT)</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">)</span></span> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">مورد بررسی قرار داده شد. </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"></span></span><br> <strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">یافته‌ها</span></span></strong><strong><span dir="LTR"><span style="font-family:Times New Roman,serif;">:</span></span></strong> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">براساس نتایج حد</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">اکثر راندمان حذف پارامترهای </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">COD</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">، </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">BOD₅</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> و </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">TSS</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> به‌ترتیب برابر با 62، 66/6&nbsp;و 71/2 درصد </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">در قلیائیت </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">mgCaCO₃/L</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> 1260 به‌دست آمد همچنین، دوز بهینه جهت تامین یک واحد قلیائیت توسط</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">Na₂CO₃,Ca(OH)₂ </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">&nbsp;و </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">MgO</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> به</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">‌</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">ترتیب </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">mg/L</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> 0/53</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">، 0/54 و</span></span> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">0/3&nbsp;</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">در زمان تماس</span></span> &nbsp;<span dir="LTR"><span style="font-family:Times New Roman,serif;">min</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">5 </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">و میزان اختلاط</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;"> rpm </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">150</span></span> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">و برای</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">NaOH </span></span>&nbsp;<span dir="LTR"><span style="font-family:Times New Roman,serif;">&nbsp;mg/L</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">0/35 در زمان</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;"> min </span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">3 و اختلاط </span></span>&nbsp;<span dir="LTR"><span style="font-family:Times New Roman,serif;">rpm</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">100</span></span> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">به‌دست آمد.</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;"></span></span><br> <strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">نتیجه‌گیری</span></span></strong><strong><span dir="LTR"><span style="font-family:Times New Roman,serif;"> :</span></span></strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">نتایج نشان داد</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> عملکرد راکتور بافل &shy;دار بی</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">&shy;</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">هوازی ارتباط زیادی با تامین قلیائیت ورودی به راکتور دارد</span></span> <span style="font-family:B Lotus;"><span style="font-size:12.0pt;">و استفاده از </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">MgO</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> می</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">&shy;</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">تواند به‌عنوان یک ماده قلیایی مناسب جهت خنثی</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">&shy;</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">سازی فاضلاب</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">&shy;</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">های اسیدی و تامین قلیائیت سیستم </span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">ABR</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> مورد توجه قرار</span></span><span dir="LTR"><span style="font-family:Times New Roman,serif;">&shy;</span></span><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> گیرد.</span></span><strong><span dir="LTR"><span style="font-family:Times New Roman,serif;"></span></span></strong></div> <div style="text-align: justify;"><strong>Background and </strong><strong>Objective:</strong> Considering the importance of alkalinity in pH regulation and its buffering role, in this study, the effect of inlet wastewater alkalinity on the efficiency of the anaerobic unit of the wastewater treatment plant. Moreover, a superior chemical compound in providing alkalinity to wastewater was investigated. <span dir="RTL"></span><br> <strong>Materials and Methods:</strong> This study was performed in the treatment plant to determine the relationship between input alkalinity and removal efficiencies of COD, BOD₅ and TSS. In order to determine the optimal alkali material for superb anaerobic wastewater performance, four common chemical substances including, NaOH, Na₂CO₃, Ca(OH)₂ and MgO were selected and examined using One Factor At Time (OFAT) test method.<br> <strong>Results: </strong>According to the results maximum removal efficiencies were obtained 62, 66.6 and 71.2% for COD, BOD₅ and TSS, respectively under alkaline condition of 1260 mg/L CaCO₃. Furthemore, the optimal dose to supply one unit of alkalinity by Na₂CO₃, Ca(OH)₂ and MgO were 0.53, 0.54 and 0.3 mg/L, respectively. These values were obtained 5 min contact time and mixing rate of 150 rpm. However, for NaOH the optimal dose supply was obtained 0.35 mg/L for 3 min contact time and mixing rate of 100 rpm.<br> <strong>Conclusion:</strong> In conclusion, the performance of anaerobic baffled reactor is highly related to the supply of influent alkalinity to the reactor. In addition, the use of MgO can be considered as a suitable alkaline substance to neutralize acidic wastewater and provide alkalinity for ABR system.</div> تصفیه فاضلاب صنعتی, راکتور بافل دار بی هوازی, قلیائیت, همدان Industrial wastewater treatment, Anaerobic baffled reactor, Alkalinity, Hamadan 485 494 http://ijhe.tums.ac.ir/browse.php?a_code=A-10-2332-1&slc_lang=fa&sid=1 Abdolmotaleb Seid Mohammadi عبدالمطلب صید محمدی sidmohammadi@umsha.ac.ir No Department of Environmental Health Engineering, School of Health, Hamadan University of Medical Science, Hamadan, Iran گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان، همدان، ایران Ghorban Asgari قربان عسگری g.asgari2003@gmail.com No Department of Environmental Health Engineering, School of Health, Hamadan University of Medical Science, Hamadan, Iran گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان، همدان، ایران Reza Shokoohi رضا شکوهی reza.shokohi@umsha.ac.ir No Department of Environmental Health Engineering, School of Health, Hamadan University of Medical Science, Hamadan, Iran گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان، همدان، ایران Parastoo Shahbazi پرستو شهبازی shahbazi199175@yahoo.com Yes Department of Environmental Health Engineering, School of Health, Hamadan University of Medical Science, Hamadan, Iran گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان، همدان، ایران