List of Articles Granular Activated Carbon

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  1 - Two-Step Ammonia Nitrogen Removal from Kermanshah Petrochemical Effluent Using Native Bacteria Immobilized on Granular Activated Carbon
  Mehdi Gowdini hatam godini farhad salimi
  10.22034/jest.2018.9426
  Background and objective: Petrochemical industry as well as some other industries is one of the environmental pollution which polluttted wastewater with ammonia nitrogen. The objective of this study was two-step ammonia nitrogen removal from Kermanshah Petrochemical eff More

  Background and objective: Petrochemical industry as well as some other industries is one of the environmental pollution which polluttted wastewater with ammonia nitrogen. The objective of this study was two-step ammonia nitrogen removal from Kermanshah Petrochemical effluent using native bacteria immobilized on granular activated carbon. Method:This study conducted in continuous mode using two reactors with effective volume of 1.7 l for each reactor. These  reactors operated as up-flow and fixed film. Granular activated carbon immobilized with nitrifier and denitrifire bacteria has been used as media. Initial concentrations of ammonia  and  nitrate (50-200 mg/l) with retention time (1-3 h) at pH 8 and temperature of 28 ± 3 ° C were studied.  Findings:Results showed that with increasing in retention time in both reactors nitrification and denitrification efficiency increased. The maximum nitrification and denitrification rates were 2.69 Kg NH4+/m3.d and 2.49 Kg NO3-/m3.d respectively. Maximum nitrification and denitrification rates occurred at 3h retention time and ammonia and nitrate removal efficiency were achieved 99.5 percent. Discossion and Conclusion: This study has been showed that native bacteria immobilized on granular activated carbon and use of that in a continuous up-flow attached-growth reactor for the removal of ammonia has a high efficiency. Manuscript profile
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  2 - Performance of granular activated carbon to diazinon removal from aqueous solutions
  Meghdad Pirsaheb Abdollah Dargahi
  Background and Objective: Increasing use of pesticides and improper methods of sewage disposal will cause water resources pollution and extremely damaging effects on the environment. This study aimed at Performance of granular activated carbon to diazinon removal from a More

  Background and Objective: Increasing use of pesticides and improper methods of sewage disposal will cause water resources pollution and extremely damaging effects on the environment. This study aimed at Performance of granular activated carbon to diazinon removal from aqueous solution and assessing the relationship between COD and diazinon concentration. Methods: This study is as a cross - sectional and work was carried out in lab-scale. Firstly, diazinon concentrations 1, 5, 10, 20, 30, 40, 50, 100, 150 mg/l were prepared from Stock solution (1000 mg/L), and then their COD were measured. Optimum pH for 2-4-D removal was determined and its absorption rate in different concentrations was measured. Findings: Results showed a relationship between COD and concentration. On the other hand, COD removal increased with passage of the time, so that maximum removal 88% at contact time of 50 min observed. Optimum pH for all concentrations was determined to be Discussion and Conclusion: According to present study it can be concluded that activated carbon have be high performance of diazinon removal from water. In addition, a significant relationship was observed between COD and diazinon concentration, so that direct. Manuscript profile
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  3 - Bioregeneration of GAC used in the Esfahan's Mobarakeh steel factory
  Saeedreza Asemizavareh Saeedeh Rafatnezhad
  The objective of this study is to investigate the possibility of using a microbial mix to biodegrade the chemical wastewater (mainly phenol compounds) of the Mobarakeh steel factory (Esfahan-Iran) adsorbed on granular activated carbon (GAC) and to determine the adsorpti More

  The objective of this study is to investigate the possibility of using a microbial mix to biodegrade the chemical wastewater (mainly phenol compounds) of the Mobarakeh steel factory (Esfahan-Iran) adsorbed on granular activated carbon (GAC) and to determine the adsorption capacity of the bioregenerated GAC. The apparatus consisted of a continuous reactor made of glass with the dimensions of 43 × 29 × 50 cm (L × W × H), with continuous airing supplied by a compressor and a 24-h feeding system. The microbes were acclimated for 3 months inside the reactor under these conditions: temperature of 30 ± 1 ºC, continuous feeding with a synthetic wastewater (C12H22O11 - CO (NH2)2 - Na2HPo4 at a daily loading rate of 1000 mg COD/L day) and continuous airing by the compressor. After the acclimation period (3 months), 300 g of the used GAC is introduced into the reactor, and a 2-month period of bioregeneration is started. At the beginning of this period, the COD of the feed solution was 500 mg L-1 as in the other studies and the amounts of mixed liquor suspended solids (MLSS) was 2420 (mg L-1). The regeneration efficiency (RE) increases from 6% on day 7 of the bioregeneration process to 28% on day 53, with the MLSS increasing from 3520 mg L-1 on day 7 to 13460 mg L-1 on day 53. The results indicate that the increase of MLSS affects the regeneration efficiency of GAC. The phenol adsorption capacities of the new GAC, used GAC (without bioregeneration), bioregenerated GAC (for 7 days) and the bioregenerated GAC (for 53 days) were 90.87, 0.00, 5.06 and 26.29 mg L-1, respectively. Therefore, the adsorption capacity of the 53-day bioregenerated GAC was higher than that of the used GAC without regeneration and of the GAC bioregenerated for shorter periods (7, 14, 23, 38, 45 days). This demonstrates that the bioregenerated GAC can be recycled and used for phenol adsorption for longer periods. Manuscript profile