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Dong J.,Harbin Institute of Technology | Wang L.,Harbin Institute of Technology | Ma F.,Harbin Institute of Technology | Ma F.,HIT Yixing Academy of Environmental Protection | And 3 more authors.
RSC Advances | Year: 2016

Atrazine residues in water pose a serious threat to the environment and to human health. One method to reduce levels of atrazine in the environment is phytoremediation, a potential technology for in situ remediation. However, as atrazine is a herbicide, it damages the growth of plants and weakens the effect of phytoremediation. In this work, a pot culture experiment was conducted to investigate the effect of Funnelliformis mosseae inoculation on the phytoremediation of atrazine by Canna indica L. var. flava Roxb. The results demonstrated that C. indica was found as a novel tolerant species, and that inoculation with F. mosseae can alleviate the physiological inhibition of atrazine in the growth of plants and promote photosynthesis. Furthermore, C. indica inoculated with F. mosseae exhibited a greater efficiency to remove atrazine and to lower atrazine residue concentrations than plants without inoculation. With inoculation of F. mosseae, the maximum removal rates increased from 68.064% to 95.670%, while the concentration with the highest removal rates changed from 1.489 mg L-1 to 7.363 mg L-1. Inoculation of F. mosseae contributed 2.2-52.0% to the removal rate. This study shows that C. indica inoculated with F. mosseae may ultimately serve as a viable phytoremediation solution for in situ remediation. © The Royal Society of Chemistry 2016. Source


Wang B.,China University of Mining and Technology | Zhang Y.,China University of Mining and Technology | Zong Y.,HIT Yixing Academy of Environmental Protection | Li Y.,China University of Mining and Technology | Ma H.,China University of Mining and Technology
Asian Journal of Chemistry | Year: 2015

This study investigated the effects of carbon-total nitrogen ratio (C/TN) and influent flow rate distribution ratio on nitrogen and phosphorus removal by a single-sludge system named anaerobic and aerobic flow end with anoxic activated sludge process. The results showed that C/TN was 10 and influent flow rate distribution ratio was 1:2:2:1, nitrogen removal and phosphorus uptaken are best. chemical oxygen demand can be reduced by 84%, total nitrogen can be removed 81%, phosphorus and ammonia nitrogen can be reduced by 86 and 84%, respectively. Keep the C/P same, when C/TN rose from 10 to 20, total phosphorus removal decreased by 25%, but total nitrogen removal rate increased. Denitrifying phosphorus accumulating organisms (DPAOs) uptaking phosphorus need nitrate or nitrite as electron acceptor, nitrogen decreased led to less electron acceptor. The less electron acceptor led to less phosphorus uptakes. As C/TN decreased from 10 to 5, phosphorus removal decreased too. Because keep the C/P same, C/TN decreased, P/TN decreased too. Remaining nitrate flow into anaerobic, anaerobic phosphorus release and phosphorus uptakes was inhibited. Changing the influent flow rate distribution ratio has little influence on nitrogen removal and phosphorus uptakes. It was indicated that anaerobic and aerobic flow end with anoxic activated sludge process can work well even under strong impact. © 2015, Asian Journal of Chemistry. All rights reserved. Source


Zhang X.,Harbin Institute of Technology | Wang L.,Harbin Institute of Technology | Ma F.,Harbin Institute of Technology | Ma F.,HIT Yixing Academy of Environmental Protection | Shan D.,Sino Japan Friendship Center for Environmental Protection
Water, Air, and Soil Pollution | Year: 2015

Arbuscular mycorrhizal fungi (AMF) can alter the dynamics of soluble nitrogen in paddy field soils by promoting nitrogen assimilation by rice. However, it is unknown whether this affects N2O emissions from rice paddies. This study was designed to assess the effects of AMF on N2O emissions by analyzing the relationships between AMF and the parameters affecting N2O emissions. Path analysis was used to quantitatively partition the direct and indirect effects of different parameters on N2O emissions. Results showed that N2O emissions were controlled by environmental pathways (transpiration, evaporation, and precipitation affecting soil water content) and biotic pathways (soluble nitrogen assimilation by the rice, which varies according to rice biomass). Under different water conditions, the contributions of the two pathways to N2O emissions varied strongly. During the flooding stage, the environmental pathways were dominant, but inoculation with AMF promoted the contribution of the biotic pathway to the reduction of N2O emissions. During the draining stage, the environmental pathways were dominant in the non-inoculated treatment, but inoculation made the biotic pathways dominant by increasing the biomass of rice. During the growing stage, N2O emissions from inoculated soil (17.9-492.9 μg N2O-N m-2 h-1) were significantly lower than those in non-inoculated soil (22.1-553.1 μg N2O-N m-2 h-1; p<0.05). Consequently, inoculating with AMF has the potential for mitigating N2O emissions from rice paddies. © 2015 Springer International Publishing. Source


Pang C.,Harbin Institute of Technology | Pang C.,HIT Yixing Academy of Environmental Protection | Chen H.,Harbin Institute of Technology | Li A.,Harbin Institute of Technology | And 2 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2014

Low temperature inhibits the performance of nitrogen removal efficiency during the biological treatment of municipal wastewater. Therefore, the effluent could hardly meet the emission standard. To enhance the performance of nitrogen removal at low temperature, a psychrotolerant aerobic denitrification consortium by fast enrichment and domestication was obtained, which could remove the ammonia, nitrate and organic matter simultaneously and efficiently in aeration environment under 10 ℃. The results showed that the removal efficiency of ammonium and total nitrogen by bioaugmentation was improved by 10.31%-16.89% and 25.07%-32.44%, respectively. It made the effluent quality meet the grade1A level of national discharge standard. After bioaugmentation terminating for 10 days, the remained consortium could still improve the reactor that the effluent of ammonium, nitrate, total nitrogen and CODCrconcentrations was decreased about 2.43, 3.07, 6.02 and 3.63 mg/L, respectively. The results indicated that bioaugmentation performed well and persistently. ©, 2014, Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology. All right reserved. Source


Yang J.,Harbin Institute of Technology | Wang L.,Harbin Institute of Technology | Wang L.,HIT Yixing Academy of Environmental Protection | Guo H.,Harbin Institute of Technology | And 3 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2014

To put forward a Fenton-like system based on a new type of Fe3O4 magnetic nanoparticles catalyst, Fe3O4 magnetic nanoparticles were prepared using chemical co-precipitation, and their surface was modified with tetramethyl ammonium hydroxide (TMAH). The catalyzed degradation of phenol by Fe3O4-H2O2 Fenton-like system was investigated, including the effect of catalyst dosage, H2O2 dosage, pH value and reaction time on the removal of COD and volatile phenol. The results showed that the mean size of the Fe3O4 nanoparticles is 30 nm and they show a good disparity between 20 and 100 nm. Three different doses of TMAH coated catalysts after ultrasonic pretreatment, revealed almost the same treatment efficiency of 50 mg/L phenol (112 mg/L COD equivalent) under the room temperature (13 ℃). Under the condition of 0.8 mmol/L catalyst dosage, 2.0 mmol/L H2O2 dosage, pH 4.5 and the reaction time of 180 minutes, the highest COD removal efficiency was 72%; while under the condition of 0.4 mmol/L catalyst dosage, 2.0 mmol/L H2O2 dosage, pH 4.5 and the reaction time of 90 minutes, the removal rate of volatile phenol was close to 100%. 3# Fe3O4-TMAH (2 mL)catalysts revealed optimal reuse efficiency, the removal rate of COD were 73%, 29%, 28%, 26%, the removal rate of volatile phenol were 100%, 84%, 67%, 54%. The Fenton-like system has the advantage of no redundant excess sludge producing, and the magnetic catalyst can realize quick separation and recycling under the action of outside magnetic field. ©, 2014, Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology. All right reserved. Source

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