Time filter

Source Type

Ma R.,Nanjing University | Shen J.,Harbin Institute of Technology | Li A.,Nanjing University | Li A.,Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment
Ozone: Science and Engineering

The kinetics and degradation process of meta-Chloronitrobenzene by ozonation in aqueous solution were investigated. Compared to para-chlorobenzoic acid, the rate constant of meta-Chloronitrobenzene with O3 was 0.59 L/(mol·s), while that of the reaction with •OH was 2.07 × 109 L/(mol·s). The main intermediate products were chloronitrophenols and some carboxylic acids. Neither chlorophenols nor nitrophenols was detected. The five-day biochemical oxygen demand and chemical oxygen demand were determined. The ratio of the former to the latter was above 0.3 at 20 min. It was feasible to perform a continuous biotreatment step after 20 min of ozonation. © 2014, Copyright © 2014 International Ozone Association. Source

Shi P.,Nanjing University | Jia S.,Nanjing University | Zhang X.-X.,Nanjing University | Zhang X.-X.,Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment | And 7 more authors.
Journal of Hazardous Materials

Cross-omics profiling and phenotypic analysis were conducted to comprehensively assess the toxicities of source of drinking water (SDW), effluent of conventional treatment (ECT) and effluent of advanced treatment (EAT) in a water treatment plant. SDW feeding increased body weight, and relative liver and kidney weights of mice. Hepatic histopathological damages and serum biochemical alterations were observed in the mice fed with SDW and ECT, but EAT feeding showed no obvious effects. Transcriptomic analysis demonstrated that exposure to water samples caused differential expression of hundreds of genes in livers. Cluster analysis of the differentially expressed genes which generated by both microarrays and digital gene expression showed similar grouping patterns. Proteomic and metabolomics analyses indicated that drinking SDW, ECT and EAT generated 59, 145 and 41 significantly altered proteins in livers and 8, 2 and 0 altered metabolites in serum, respectively. SDW was found to affect several metabolic pathways including metabolism of xenobiotics by cytochrome P450 and fatty acid metabolism. SDW and ECT might induce molecular toxicities to mice, but the advanced treatment process can reduce the potential health risk by effectively removing toxic chemicals in drinking water. © 2014 Elsevier B.V. Source

Long F.,Renmin University of China | Shi H.-C.,Tsinghua University | Shi H.-C.,Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment | Wang H.-C.,Renmin University of China | Sheng J.-W.,Tsinghua University
Huanjing Kexue/Environmental Science

An immunosensor for the rapid detection of 1,3-dinitrobenzene was developed based on an evanescent wave all-fiber biosensing platform with the detection limits of 0.054 mg·L-1, and the detection cycle was less than 10 min. Hapten-carrier conjugates NB-OVA were synthesized by mixing 4-nitrohippuric acid and OVA activated by EDC, and then the conjugates were immobilized onto the silane layer on the probe with a heterobifunctional crosslinker. The probe modified had good robustness and regeneration performance, which allowed the performance of more than 100 assay cycles without significant loss of reactivity. Several water samples of different origins were measured with less than 4.5%-10.0% deviation of the detection and the recovery rate of 1,3-dinitrobenzene was between 80% and 120%, which proved the system's precision and accuracy and negligible matrix effects. This immunosensor shows great potential in rapid detection of 1,3-dinitrobenzene in practical waters. Source

Wang Q.,Nanjing University | Shi P.,Nanjing University | Ma Y.,Nanjing University | Li A.,Nanjing University | And 6 more authors.
Chemical Engineering Journal

The aim of this study was to evaluate the performance of quaternized magnetic microspheres (NDMP) on control of disinfection by-products (DBPs) and toxicity in drinking water. High concentrations of dissolved organic carbon (6.7. mg/L) and bromide (185. μg/L) were present in the raw water. The NDMP showed good performance on removing dissolved organic matter, bromide and dissolved organic nitrogen. In the present study, we investigated the formation potential (FP) of DBPs as well as the human hepatoma cells cytotoxicity and genotoxicity before and after resin treatment. The results showed that the FP of trihalomethanes (THMs), haloacetic acids (HAAs) and haloacetonitriles (HANs) were greatly reduced by the NDMP treatment with maximum removal efficiency of 73%, 56% and 81%, respectively. Additionally, the NDMP resin greatly reduced the cytotoxicity and genotoxicity of the raw water during subsequent chlorination. With increasing bromide levels, the FP of THMs, HAAs and HANs were increased by 31%, 36% and 27%, respectively. On the contrary, the FP of THMs, HAAs and HANs were reduced by 85%, 77% and 69% when the ammonia concentration reached to 10.5. mg/L. The addition of bromide increased the toxicity after chlorination due to the formation of more toxic brominated DBPs. NDMP can efficiently control the DBPs formation and toxicity in treated water, which provide us a new kind of advanced drinking water treatment technology in the future. © 2014 Elsevier B.V. Source

Wang Q.,Nanjing University | Ma Y.,Nanjing University | Li A.,Nanjing University | Li A.,Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment | And 4 more authors.
Desalination and Water Treatment

The removal of dissolved organic matters (DOM) in the raw water of Tongyu River using a new magnetic anion-exchange resin (NDMP) was investigated. NDMP was more effective than a commercial magnetic ion-exchange resin (MIEX) for the purification of drinking water. NDMP can eliminate 49% of dissolved organic carbon (DOC) and 86% of UV absorbance at 254 nm (UV254) in the raw water within 30 min. During multiple-loading jar tests, DOC of the effluent was 2.1 mg/L at 100 BV and increased to 3.0 mg/L after the loading of 1,200 BV by NDMP treatment. The saturated resin was renewed after regeneration with sodium chloride. NDMP displayed high removal ability for both hydrophobic acid (HPO) and transphilic acid (TPI) compared to MIEX resin, whereas the removal rate of hydrophilic (HPI) was relatively low. The removal rates of HPO, TPI, and HPI in the raw water at the NDMP amount of 10 mL/L were 62, 65, and 24%, respectively. Therefore, the NDMP resin can be used in the purification of drinking water at high DOC level. © 2014 Balaban Desalination Publications. All rights reserved. Source

Discover hidden collaborations