USE OF SULFATE-REDUCING BACTERIA FOR THE PRECIPITATION OF HEAVY METAL CADMIUM FROM SOLUTION. Masters thesis, King Fahd University of Petroleum and Minerals.

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Arabic Abstract

ﺗُﻌﺪ ﺗﻠﻮث اﻟﻤﻌﺎدن اﻟﺜﻘﯿﻠﺔ ﻓﻲ اﻟﺒﯿﺌﺎت اﻟﻤﺎﺋﯿﺔ ﻣﺸﻜﻠﺔ ﻋﺎﻟﻤﯿﺔ ﻛﺒﯿﺮة، ﺗﺸﻜﻞ ﺗﮭﺪﯾﺪات ﺧﻄﯿﺮة ﻟﺼﺤﺔ اﻹﻧﺴﺎن واﻟﺒﯿﺌﺔ. وﻋﻠﯿﮫ، ﻓﺈن ﺗﻄﻮﯾﺮ طﺮق ﺟﺪﯾﺪة وﻣﺴﺘﺪاﻣﺔ وﺻﺪﯾﻘﺔ ﻟﻠﺒﯿﺌﺔ ﻟﺘﻨﻘﯿﺔ ﺗﻠﻮث اﻟﻤﻌﺎدن اﻟﺜﻘﯿﻠﺔ أﻣﺮ ﺣﯿﻮي. ﯾﻘﺪم اﻟﻌﻤﻠﯿﺔ اﻟﺒﯿﻮﻟﻮﺟﯿﺔ ﻹزاﻟﺔ اﻟﻤﻌﺎدن اﻟﺜﻘﯿﻠﺔ، ﺧﺎﺻﺔ ﺑﺎﺳﺘﺨﺪام اﻟﺒﻜﺘﯿﺮﯾﺎ اﻟﻤﺨﺘﺰﻟﺔ ﻟﻠﻜﺒﺮﯾﺘﺎت )SRB( ، ﻧﮭﺠًﺎ ﺷﺎﻣﻼً ﯾﺘﻤﯿﺰ ﺑﺎﻟﺘﻮاﻓﻖ اﻟﺒﯿﺌﻲ، وﻓﻌﺎﻟﯿﺔ اﻟﺘﻜﻠﻔﺔ، واﻻﻧﺘﻘﺎﺋﯿﺔ، واﻻﺳﺘﻘﺮار طﻮﯾﻞ اﻷﺟﻞ. ﯾُﺸﻜﻞ اﻟﻜﺎدﻣﯿﻮم، وھﻮ ﻣﻌﺪن ﺛﻘﯿﻞ ﺳﺎم، ﺗﮭﺪﯾﺪًا ﻛﺒﯿﺮً ا ﻟﻠﻨﻈﻢ اﻟﺒﯿﺌﯿﺔ وﺻﺤﺔ اﻹﻧﺴﺎن. ﺗﻘﯿﻢ ھﺬه اﻟﺪراﺳﺔ ﻗﺪرة اﻟـ SRB ﻋﻠﻰ ﺗﺴﮭﯿﻞ ﺗﻜﻮﯾﻦ رواﺳﺐ ﻛﺒﺮﯾﺘﯿﺪ اﻟﻜﺎدﻣﯿﻮم)(CdS ، واﻟﺘﻲ ﯾﺴﮭﻞ اﺳﺘﺮدادھﺎ. ﺷﻤﻠﺖ ﺗﺠﺎرﺑﻨﺎ ﺗﺤﺴﯿﻦ اﻟﻈﺮوف اﻟﻤﻨﮭﺠﯿﺔ ﻟـ SRB ﻣﻦ ﺧﻼل دﻣﺞ أﻛﺴﯿﺪ اﻟﺠﺮاﻓﯿﻦ .(GO) ﻓﻲ اﻟﺒﺪاﯾﺔ، أظﮭﺮت اﻟـ SRB ﻗﺪرﺗﮭﺎ ﻋﻠﻰ ﺗﺮﺳﯿﺐ اﻟﻜﺎدﻣﯿﻮم ﺑﻜﻔﺎءة ﺗﺼﻞ إﻟﻰ 59%. وﻗﺪ ﺗﻨﺎوﻟﺖ اﻷﺑﺤﺎث اﻹﺿﺎﻓﯿﺔ اﻟﺘﺮﻛﯿﺰات اﻟﺘﻲ ﺗﻌﯿﻖ ﻧﻤﻮ اﻟﺒﻜﺘﯿﺮﯾﺎ. ﻓﻲ اﻟﻤﺮﺣﻠﺔ اﻟﺘﺠﺮﯾﺒﯿﺔ اﻟﻨﮭﺎﺋﯿﺔ، ﺗﻢ دراﺳﺔ اﺳﺘﺨﺪام أﻛﺴﯿﺪ اﻟﺠﺮاﻓﯿﻦ اﻟﻤﺨﻔﺾ)(rGO ، واﻟﺬي ﻛﺸﻒ ﻋﻦ أنrGO ﻗﺪ ﻋﺰز ﻣﻦ ﻣﻌﺪل ﺗﺮﺳﯿﺐ اﻟﻜﺎدﻣﯿﻮم، ﻣﻤﺎ زاد ﻣﻦ ﻛﻔﺎءة اﻹزاﻟﺔ إﻟﻰ 89% ﺧﻼل ﺧﻤﺴﺔ أﯾﺎم ﻓﻘﻂ — وھﻮ أﺳﺮع ﺑﻜﺜﯿﺮ ﻣﻦ اﻟـ 25ﯾﻮﻣًﺎ اﻟﻼزﻣﺔ ﺗﺤﺖ اﻟﻈﺮوف اﻟﻘﯿﺎﺳﯿﺔ ﺑﺪون .GO ﺗﻮﻓﺮ ھﺬه اﻟﻨﺘﺎﺋﺞ رؤى ﺣﺎﺳﻤﺔ ﺣﻮل إﻣﻜﺎﻧﯿﺎت اﻟـ SRB ﻓﻲ اﻟﺘﺨﻔﯿﻒ ﻣﻦ ﺗﻠﻮث اﻟﻜﺎدﻣﯿﻮم ﻓﻲ أﻧﻈﻤﺔ اﻟﻤﯿﺎه، ﻣﻤﺎ ﯾﺒﺮز اﻟﺘﺤﺴﯿﻨﺎت اﻟﻜﺒﯿﺮة اﻟﺘﻲ أﺣﺪﺛﮭﺎ دﻣﺞrGO وﯾﺆﻛﺪ ﻋﻠﻰ إﻣﻜﺎﻧﯿﺔ ﺗﻄﺒﯿﻖ ھﺬه اﻟﺘﻜﻨﻮﻟﻮﺟﯿﺎ اﻟﺒﯿﻮﻟﻮﺟﯿﺔ ﻋﻠﻰ ﻧﻄﺎق ﺻﻨﺎع

English Abstract

Contamination of aquatic environments with heavy metals poses significant global concerns, threatening human health and environmental stability. As such, developing new, sustainable, and environmentally friendly remediation methods for heavy metal pollution is crucial. Using sulfur-reducing bacteria (SRB) for the biological removal of heavy metals presents a holistic approach that is environmentally compatible, cost-effective, selective, and stable over the long term. Cadmium, a toxic heavy metal, significantly threatens ecosystems and human health. This study assesses the ability of SRB to facilitate the formation of cadmium sulfide (CdS) precipitates, which are easily recoverable. Our experiments involved the systematic optimization of conditions for SRB through the integration of graphene oxide (GO). Initially, the SRB demonstrated the capability to precipitate cadmium with an efficiency of up to 59%. Further investigations explored the concentration of cadmium that inhibits bacterial growth. In the final experimental phase, the use of GO was studied, revealing that GO enhanced the cadmium precipitation rate, increasing removal efficiency to 89% within just 5 days—significantly faster than the 25 days required under standard conditions without GO. These findings provide crucial insights into the potential of SRB in mitigating cadmium pollution in water systems, highlighting the significant enhancements brought by GO integration, and underscore the potential scalability of this bioremediation technology for industrial applications.

Item Type:	Thesis (Masters)
Subjects:	Environmental Civil Engineering > Water and Environmental Engineering Research > Environment
Department:	College of Chemicals and Materials > Bioengineering
Committee Advisor:	Nzila, Alexis Mounda
Committee Members:	Baig, Nadeem and Faizan Khan, Muhammad
Depositing User:	AHMAD RUFA'I USMAN (g202210440)
Date Deposited:	01 Jan 2025 06:18
Last Modified:	01 Jan 2025 06:18
URI:	http://eprints.kfupm.edu.sa/id/eprint/143210