بررسي عوامل مؤثر بر بازده حذف مواد آلي در راكتور بافل دار بي هوازي مجهز به سامانه الكتروليز

Evaluation of Effective Parameters in Organic Matters Removal Efficiency of Anaerobic Baffled Reactor Employing Electrolysis Process

ﭼﮑﯿﺪه زﻣﯿﻨﻪ و ﻫﺪف: در ﭘﯽ ﻧﺘﺎﯾﺞ ﺗﺤﻘﯿﻘﺎت ﭘﯿﺸﯿﻦ ﺣﺎﺻﻞ از ﺑﻪ ﮐﺎرﮔﯿﺮي ﻓﺮآﯾﻨﺪ اﻟﮑﺘﺮوﻟﯿﺰ ﺟﻬﺖ اﻓﺰاﯾﺶ ﮐﺎرآﻣﺪي راﮐﺘﻮر ﺑﺎﻓﻞدار ﺑﯽﻫﻮازي، ﺗﺤﻘﯿﻖ ﺣﺎﺿﺮ ﺑﺎ ﻫﺪف ﺑﺮرﺳﯽ ﻋﻤﻠﮑﺮد اﯾﻦ راﮐﺘﻮر )EABR( ﺑﺮاي ﺗﺼﻔﯿﻪ ﻓﺎﺿﻼب در زﻣﺎن ﻣﺎﻧﺪﻫﺎي ﻫﯿﺪروﻟﯿﮑﯽ، ﭼﮕﺎﻟﯽ ﺟﺮﯾﺎنﻫﺎي اﻟﮑﺘﺮﯾﮑﯽ و ﺑﺎرﮔﺬاريﻫﺎي آﻟﯽ ﻣﺨﺘﻠﻒ ﺻﻮرت ﮔﺮﻓﺘﻪ اﺳﺖ. روش ﺑﺮرﺳﯽ: ﯾﮏ ﭘﺎﯾﻠﻮت ﻧﯿﻤﻪ ﺻﻨﻌﺘﯽ از راﮐﺘﻮر ﺑﺎﻓﻞدار ﺑﯽﻫﻮازي ﺑﺎ ﺣﺠﻢ ﮐﻠﯽ L 72 ﺑﻪ ﺳﺎﻣﺎﻧﻪ اﻟﮑﺘﺮوﻟﯿﺰ ﺑﺎ اﻟﮑﺘﺮودﻫﺎﯾﯽ از ﺟﻨﺲ آﻫﻦ ﻣﺠﻬﺰ ﮔﺮدﯾﺪ. در اﯾﻦ راﺳﺘﺎ ﺑﺎزده ﺣﺬف COD و ﻣﺪت زﻣﺎن ﻻزم ﺑﺮاي ﺳﺎزﮔﺎري ﺑﺎﮐﺘﺮيﻫﺎ ﺑﺎ ﺷﺮاﯾﻂ ﺟﺪﯾﺪ ﺑﻪ ﻋﻨﻮان ﻓﺎﮐﺘﻮرﻫﺎي ﻣﻌﺮف ﻋﻤﻠﮑﺮد راﮐﺘﻮر ﺑﺮرﺳﯽ ﺷﺪﻧﺪ. ﯾﺎﻓﺘﻪﻫﺎ: ﺑﺎ ﮐﺎﻫﺶ زﻣﺎن ﻣﺎﻧﺪ ﻫﯿﺪروﻟﯿﮑﯽ، از 45 ﺑﻪ 38 و 29 ﺳﺎﻋﺖ، ﺑﺎزده ﺣﺬف COD از 77/6 ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﻪ 74/9 و 72/2 درﺻﺪ رﺳﯿﺪ. ﺑﺎ ﮐﺎﻫﺶ ﭼﮕﺎﻟﯽ ﺟﺮﯾﺎن اﻟﮑﺘﺮﯾﮑﯽ از 3 ﺑﻪ 1 ،2 و 0/5 ﻣﯿﻠﯽ آﻣﭙﺮ ﺑﺮ ﺳﺎﻧﺘﯽﻣﺘﺮ ﻣﺮﺑﻊ، ﺑﺎزده ﺣﺬف COD از 77/6 ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﻪ 71/2 ،73/5 و 70/0 درﺻﺪ ﺗﻨﺰل ﯾﺎﻓﺖ. ﻫﻤﭽﻨﯿﻦ ﺑﺎ اﻓﺰاﯾﺶ ﺑﺎر آﻟﯽ ورودي از 700 ﺑﻪ 2400 ﻣﯿﻠﯽﮔﺮم ﺑﺮ ﻟﯿﺘﺮ، ﺑﺎزده ﺣﺬف COD از 77/6 ﺑﻪ 90/2 درﺻﺪ رﺳﯿﺪ. ﺑﺤﺚ و ﻧﺘﯿﺠﻪﮔﯿﺮي: در ﺑﯿﻦ ﻋﻮاﻣﻞ ﻣﻮردﺑﺮرﺳﯽ، ﺗﻐﯿﯿﺮات زﻣﺎن ﻣﺎﻧﺪ ﻫﯿﺪروﻟﯿﮑﯽ، ﮐﻢﺗﺮﯾﻦ ﺗﺄﺛﯿﺮ را ﺑﺮ ﺑﺎزده ﺣﺬف COD داﺷﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﺑﺮرﺳﯽﻫﺎي اﻧﺠﺎم ﺷﺪه، ﻣﺪتزﻣﺎن ﻻزم ﺑﺮاي رﺳﯿﺪن راﮐﺘﻮر ﺑﻪ ﺷﺮاﯾﻂ ﭘﺎﯾﺪار در ﺑﺎرﻫﺎي آﻟﯽ 2000 ،1500 ،1000 ،700 و 2400 ﻣﯿﻠﯽﮔﺮم ﺑﺮ ﻟﯿﺘﺮ ﺑﻪ ﺗﺮﺗﯿﺐ 6 ،5 ،5 ،3 و 8 روز ﻣﯽﺑﺎﺷﺪ ﮐﻪ ﮐﻮﺗﺎهﺗﺮ از ﻣﺪت زﻣﺎن ﻻزم ﺑﺮاي ﭘﺎﯾﺪاري راﮐﺘﻮر ABR اﺳﺖ. درﻧﺘﯿﺠﻪ ادﻏﺎم راﮐﺘﻮر ABR ﺑﺎ ﻓﺮآﯾﻨﺪ اﻟﮑﺘﺮوﻟﯿﺰ راه ﺣﻞ ﻣﻨﺎﺳﺒﯽ ﺑﻪﻣﻨﻈﻮر ارﺗﻘﺎي ﻋﻤﻠﮑﺮدي آن ﻣﯽﺑﺎﺷﺪ.

Background and Objective: Following the results of the electrolysis process application to upgrade the anaerobic baffled reactor for treating wastewater, the present study was conducted to evaluate the EABR performance efficiency, considering hydraulic retention time (HRT), current density and organic loading. Methods: In this study, a semi-industrial pilot of ABR with total volume of 72 L was studied before and after integration with an electrolysis system. The performance of the reactor was evaluated in terms of COD removal and bacterial adaption time. Findings: The findings revealed that a HRT reduction from 45 to 38 and 29 hours results in a decrease of COD removal efficiency from 77.6 to 74.9 and 72.2 % respectively. Also, a current density reduction from 3 to 2, 1, and 0.5 Mill ampere/cm2 results in a decreasing COD removal efficiency from 77.6 to 73.5, 71.2, and 70 % respectively. Moreover, an increasing organic loading from 700 to 2400 mg/L enhanced the COD removal efficiency from 77.6 to 90.2 %. Result and Discussion: The results showed that by increasing organic loading from 700 to 1000, 1500, 2000, and 2400 mg/L the necessary HRT for achieving operation stability increases from 3 to 8 days, which is less than in conventional ABR. Therefore, employing electrolysis process is a sustainable method for improving ABR performance efficiency.