Browsing by Author "Kengara, Fredrick O"
Now showing items 1-19 of 19
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Does powder and granular activated carbon perform equally in immobilizing chlorobenzenes in soil?
Song, Yang; Wang, Fang; Kengara, Fredrick O; Bian, Yongrong; Yang, Xinglun; Gu, Chenggang; Ye, Mao; Jiang, Xin (Royal Society of Chemistry, 2015)The objective of this study is to compare the efficacies of powder activated carbon (PAC) and granular activated carbon (GAC) as amendments for the immobilization of volatile compounds in soil. Soil artificially-spiked ... -
Effect of anthropogenic activities on the water quality of Amala and Nyangores tributaries of River Mara in Kenya
Nyairo, Wilfrida N; Owuor, Philip O; Kengara, Fredrick O (2015-10-30)Abstract Mau Forest in the upper reaches of the Mara River basin has recently undergone increased forest destruction followed by human settlement and agricultural activities. These anthropogenic activities may be ... -
Effects of pH and metal ions on oxytetracycline sorption to maize-straw-derived biochar
Jia, Mingyun; Wang, Fang; Bian, Yongrong; Jin, Xin; Song, Yang; Kengara, Fredrick O; Xu, Renkou; Jiang, Xin (Elsevier, 2013-05-30)Biochars produced from biomass residues have been recognized as effective sorbents to hydrophobic compounds, but knowledge on sorption of antibiotics to biochar and its mechanisms are still inadequate. Sorption of ... -
Enhanced degradation of 14 C-HCB in two tropical clay soils using multiple anaerobic–aerobic cycles
Kengara, Fredrick O; Doerfler, Ulrike; Welzl, Gerhard; Ruth, Bernhard; Munch, Jean C; Schroll, Reiner (2013-02-28)The aim of the study was to induce and enhance the degradation of hexachlorobenzene (HCB), a highly-chlorinated persistent organic pollutant, in two ecologically different tropical soils: a paddy soil (PS) and a non-paddy ... -
Enhanced soil washing process for the remediation of PBDEs/Pb/Cd-contaminated electronic waste site with carboxymethyl chitosan in a sunflower oil–water solven...
Ye, Mao; Sun, Mingming; Wan, Jinzhong; Fang, Guodong; Li, Huixin; Hu, Feng; Jiang, Xin; Kengara, Fredrick O (2015-02-01)Abstract An innovative ex situ soil washing technology was developed to remediate polybrominated diphenyl ethers (PBDEs) and heavy metals in an electronic waste site. Elevated temperature (50° C) in combination with ... -
Evaluation of enhanced soil washing process and phytoremediation with maize oil, carboxymethyl-β-cyclodextrin, and vetiver grass for the recovery of organochlorin...
Ye, Mao; Sun, Mingming; Liu, Zongtang; Ni, Ni; Chen, Yinwen; Gu, Chengang; Kengara, Fredrick O; Li, Huixin; Jiang, Xin (Academic Press, 2014-08-01)Abstract An innovative ex situ soil washing technology was developed in this study to remediate organochlorine pesticides (OCPs) and heavy metals in a mixed contaminated site. Elevated temperature (60 C) combined with ... -
Evaluation of soil washing process with carboxymethyl-β-cyclodextrin and carboxymethyl chitosan for recovery of PAHs/heavy metals/fluorine from metallurgic plant...
Ye, Mao; Sun, Mingming; Kengara, Fredrick O; Wang, Jingting; Ni, Ni; Wang, Li; Song, Yang; Yang, Xinglun; Li, Huixin; Hu, Feng; Jiang, Xin (Elsevier, 2014-08-01)Abstract Polycyclic aromatic hydrocarbons (PAHs)/heavy metals/fluorine (F) mixed- contaminated sites caused by abandoned metallurgic plants are receiving wide attention. To address the associated environmental problems, ... -
Feasibility of an enhanced washing process to extract PBDEs/heavy metals/antibiotics from antibiotic resistance gene-affected soil with aqueous DNA followed by mi...
Ye, Mao; Sun, Mingming; Wan, Jinzhong; Zhao, Yu; Xie, Shanni; Tian, Da; Hu, Feng; Li, Huixin; Zong, Lianggang; Kengara, Fredrick O; Xin, Jiang Xin (2016-03-01)Abstract Purpose Remediation of polybrominated diphenyl ethers (PBDEs)/heavy metals/antibiotics mixed contaminated soil with high abundance of antibiotic resistance genes (ARGs) has being greatly challenging. Materials ... -
Function of Nitrate Ion and Tea Saponin Application Rates in Anerobic PAH Dissipation in Paddy Soil
Sun, Mingming; Ye, Mao; Shen, Fangyuan; Xu, Jingjing; Ye, Chenglong Ye; Yu, Li; Hu, Feng; Li, Huixin; Jiang, Xin; Kengara, Fredrick O (2016-06-01)Abstract In the present study, KNO 3 and tea saponin (TS) were applied to investigate systematically the potential impact of their concentrations on dissipation of anerobic polycyclic aromatic hydrocarbons (PAH) in ... -
Immobilization of chlorobenzenes in soil using wheat straw biochar
Song, Yang; Wang, Fang; Kengara, Fredrick O; Yang, Xinglun; Gu, Chenggang; Jiang, Xin (American Chemical Society, 2013-04-25)Biochar has shown great potential for immobilizing organic contaminants in soil. In this study, pentachlorobenzene (PeCB), 1, 2, 4, 5-tetrachlorobenzene (1, 2, 4, 5-TeCB), and 1, 2, 4-trichlorobenzene (1, 2, 4-TCB) ... -
Impact of bioaccessible pyrene on the abundance of antibiotic resistance genes during Sphingobium sp.-and sophorolipid-enhanced bioremediation in soil
Sun, Mingming; Ye, Mao; Wu, Jun; Feng, Yanfang; Shen, Fangyuan; Tian, Da; Liu, Kuan; Hu, Feng; Li, Huixin; Jiang, Xin; Yang, Linzhang; Kengara, Fredrick O (Elsevier, 2015-12-30)Abstract Soils are exposed to various types of chemical contaminants due to anthropogenic activities; however, research on persistent organic pollutants and the existence of antibiotic resistance genes (ARGs) is limited. ... -
The interactive biotic and abiotic processes of DDT transformation under dissimilatory iron-reducing conditions
Jin, Xin; Wang, Fang; Gu, Chenggang; Yang, Xinglun; Kengara, Fredrick O; Bian, Yongrong; Song, Yang; Jiang, Xin (Pergamon, 2015-11-30)Abstract The objective of the study was to elucidate the biotic and abiotic processes under dissimilatory iron reducing conditions involved in reductive dechlorination and iron reduction. DDT transformation was ... -
Isolation and characterization of a toxic metal-tolerant Phenanthrene-degrader Sphingobium sp. in a two-liquid-phase partitioning bioreactor (TPPB)
Wang, Congying; Wang, Fang; Hong, Qing; Zhang, Yinping; Kengara, Fredrick O; Li, Zengbo; Jiang, Xin (2013-10-01)A phenanthrene-degrading strain PHE3, identified as the genus of Sphingobium, was isolated using a two-liquid-phase partitioning bioreactor. More than 96% of the initial amount (up to 100 mg l− 1 silicone oil) of ... -
The mechanism of 2-chlorobiphenyl oxidative degradation by nanoscale zero-valent iron in the presence of dissolved oxygen
Wang, Yu; Liu, Linhao; Fang, Guodong; Wang, Lei; Kengara, Fredrick O; Zhu, Changyin (Springer Berlin Heidelberg, 2017-11-08)It has recently been demonstrated that the addition of nanoscale zero-valent iron (nZVI) to oxygen-containing water or soil aquifers results in the oxidation of organic compounds. However, there has been little insight ... -
Positive relationship detected between soil bioaccessible organic pollutants and antibiotic resistance genes at dairy farms in Nanjing, Eastern China
Sun, Mingming; Ye, Mao; Wu, Jun; Feng, Yanfang; Wan, Jinzhong; Tian, Da; Shen, Fangyuan; Liu, Kuan; Hu, Feng; Li, Huixin; Jiang, Xin; Yang, Linzhang; Kengara, Fredrick O (Elsevier, 2015-11-30)Abstract Co-contaminated soils by organic pollutants (OPs), antibiotics and antibiotic resistance genes (ARGs) have been becoming an emerging problem. However, it is unclear if an interaction exists between mixed ... -
Remediation of organochlorine pesticides (OCPs) contaminated site by successive methyl-β-cyclodextrin (MCD) and sunflower oil enhanced soil washing–portulaca...
Ye, Mao; Sun, Mingming; Hu, Feng; Kengara, Fredrick O; Jiang, Xin; Luo, Yongming; Yang, Xinlun (Pergamon, 2014-06-30)An innovative ex situ soil washing technology was developed in this study to remediate organochlorine pesticides (OCPs)-contaminated site. Elevated temperature (50 C) combined with ultrasonication (35 kHz, 30 min) at ... -
Response surface methodology to understand the anaerobic biodegradation of organochlorine pesticides (OCPs) in contaminated soil—significance of nitrate conce...
Sun, Mingming; Ye, Mao; Kengara, Fredrick O; Teng, Ying; Hu, Feng; Li, Huixin; Jiang, Xin (2014-09-01)Abstract Purpose Problems associated with Organochlorine pesticide (OCP)-contaminated soils have received wide attention. To understand the anaerobic biodegradation process constraints, innovative mathematical analysis ... -
Role of cosubstrate and bioaccessibility played in the enhanced anaerobic biodegradation of organochlorine pesticides (OCPs) in a paddy soil by nitrate and methyl...
Ye, Mao; Sun, Mingming; Ni, Ni; Chen, Yinwen; Liu, Zongtang; Gu, Chengang; Bian, Yongrong; Hu, Feng; Li, Huixin; Kengara, Fredrick O; Jiang, Xin (Springer Berlin Heidelberg, 2014-07-01)Abstract The present study was conducted to investigate the anaerobic biodegradation potential of biostimulation by nitrate (KNO 3) and methyl-β-cyclodextrin (MCD) addition on an aged organochlorine pesticide ... -
Tenax extraction for exploring rate-limiting factors in methyl-β-cyclodextrin enhanced anaerobic biodegradation of PAHs under denitrifying conditions in a red paddy...
Sun, Mingming; Ye, Mao; Hu, Feng; Li, Huixin; Teng, Ying; Luo, Yongming; Jiang, Xin; Kengara, Fredrick O (Elsevier, 2014-01-15)The effectiveness of anaerobic bioremediation systems for PAH-contaminated soil may be constrained by low contaminants bioaccessibility due to limited aqueous solubility and lack of suitable electron acceptors. Information ...