Purification Potential of Local Media in the Pre-Treatment of Greywater Using Vertical Biofilters under Sahelian Conditions  

作　　者：Cheik Omar Tidiane Compaoré Ynoussa Maiga Amidou S. Ouili Mahamadi Nikiema Aboubakar S. Ouattara Cheik Omar Tidiane Compaoré;Ynoussa Maiga;Amidou S. Ouili;Mahamadi Nikiema;Aboubakar S. Ouattara(Laboratoire de Microbiologie et de Biotechnologie Microbienne, Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso)

机构地区：[1]Laboratoire de Microbiologie et de Biotechnologie Microbienne, Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso

出　　处：《Journal of Agricultural Chemistry and Environment》2022年第2期117-131,共15页农业化学和环境（英文）

摘　　要：Several on-site greywater treatment systems are under development including biofiltration, whose efficiency is influenced by the filter media. Therefore, the main objective of this study was to evaluate the influence of the type of filter media and their grain size in the removal of organic and microbial pollutants from greywater. Hence, three types of local filter media of different grain size were used for the pre-treatment of greywater. Their removal potential and clogging time were evaluated and compared. The results indicated that the type of filter media and the grain size have an influence on the elimination of organic and microbial pollution from greywater. Indeed, sand of 1 - 2 mm in size obtained the highest removal efficiencies of organic pollutants (67.35% and 78.04% for COD and BOD5 respectively) and microbial indicators (2.07, 1.77 and 2.27 log. units for E. coli, fecal coliforms and enterococci respectively). Although media of fine texture enhanced the removal efficiencies, they experienced significant clogging problems. To overcome these limitations while enhancing the removal efficiency, 1) pre-treatment stage with coarse materials followed by a treatment with finer materials or 2) the use of a combination of fine and coarse materials should be considered.Several on-site greywater treatment systems are under development including biofiltration, whose efficiency is influenced by the filter media. Therefore, the main objective of this study was to evaluate the influence of the type of filter media and their grain size in the removal of organic and microbial pollutants from greywater. Hence, three types of local filter media of different grain size were used for the pre-treatment of greywater. Their removal potential and clogging time were evaluated and compared. The results indicated that the type of filter media and the grain size have an influence on the elimination of organic and microbial pollution from greywater. Indeed, sand of 1 - 2 mm in size obtained the highest removal efficiencies of organic pollutants (67.35% and 78.04% for COD and BOD5 respectively) and microbial indicators (2.07, 1.77 and 2.27 log. units for E. coli, fecal coliforms and enterococci respectively). Although media of fine texture enhanced the removal efficiencies, they experienced significant clogging problems. To overcome these limitations while enhancing the removal efficiency, 1) pre-treatment stage with coarse materials followed by a treatment with finer materials or 2) the use of a combination of fine and coarse materials should be considered.

关 键 词：BIOFILTRATION Fecal Indicators Granitic Gravel GREYWATER Lateritic Gravel Sand 

分 类 号：X70[环境科学与工程—环境工程]