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Ding J.-L.,Tsinghua University | Ding J.-L.,Shanghai Normal University | Liu R.,Tsinghua University | Zheng W.,Tsinghua University | And 5 more authors.
Huanjing Kexue/Environmental Science | Year: 2015

The removal performance of 11 veterinary antibiotics in piggery wastewater and their accumulation in the activated sludge were studied in an intermittent aeration membrane bioreactor (IAMBR) at different COD/TN ratios and organic loads. The results showed that both antibiotics and chemical oxygen demand (COD) were efficiently removed at hydraulic retention time (HRT) of no less than five days and COD/TN ratio of 2.1, the removal rate was (79.1±0.7)% for total antibiotics and was (88.4±1.4)% for COD. As HRT was shortened to three days, the removal rate of COD was little changed but the removal rate of total antibiotics was significantly decreased. As COD/TN decreased from 2.1 to 0.7, the removal rate of total antibiotics was little changed, but the COD removal rate was significantly decreased. Antibiotics of tetracycline and quinolone species kept accumulating in the sludge at long SRT, and the accumulation amount was decreased with shorter SRT. The concentration and composition of antibiotic in the sludge were influenced by the raw wastewater. ©, 2015, Science Press. All right reserved.


Ding J.-L.,Tsinghua University | Ding J.-L.,Shanghai Normal University | Liu R.,Tsinghua University | Zheng W.,Tsinghua University | And 4 more authors.
Huanjing Kexue/Environmental Science | Year: 2015

In order to determine eleven commonly used veterinary antibiotics (including four tetracyclines, two sulfonamides, three quinolones and two macrolides) in piggery wastewater and activated sludge in the Yangtze River Delta region, the conditions of solid phase extraction and high performance liquid chromatography-tandem mass spectrometry were optimized. The recovery rate and relative standard deviations of the method were confirmed as 73%-105.2%, 3.1%-10.2% for piggery wastewater (n=3) and 57.4%-104.6%, 1.9%-10.9% (n=3) respectively for the activated sludge. Removal of antibiotics was then studied in a membrane bioreactor. The results showed that antibiotics of both tetracycline and sulfonamide species took a large portion in the wastewater, while tetracycline species were the dominant in the sludge. Tetracycline species in the wastewater were removed by 85.2%, mainly through biodegradation (51.9%) and secondly by sludge adsorption (33.2%). By comparison, sulfonamide species was removed by 95.8%, almost all through biodegradation while little by sludge adsorption. Flask tests suggested that the accumulated antibiotics in the sludge give no significant influence on the microbial removal of organics and ammonium. ©, 2015, Science Press. All right reserved.


Lu X.,Shanghai Normal University | Lu X.,Tsinghua University | Yu W.-J.,Jiaxing Environmental Protection Monitoring Station | Lan Y.-Q.,Tsinghua University | And 6 more authors.
Huanjing Kexue/Environmental Science | Year: 2013

Liquid chromatography and tandem mass (LC-MS/MS) followed with solid-phase extraction (SPE) was developed for simultaneously determining four classes (tetracyclines, quinolones, macrolides and sulfonamides) of ten commonly used veterinary antibiotics in groundwater of Jiaxing city, an important pig breeding base in the Yangtze River Delta region. Samples were taken from 10 typical rural river sections and 21 main urban river sections. Results revealed severe pollution existed in the rural river environment. The total concentration of ten antibiotics was as high as 65.6-467.0 ng · L-1, among which tetracyclines and sulfonamides respectively ranged in 40.8-253.0 ng · L-1 and undetected (nd)-165.0 ng · L-1, macrolides and quinolones respectively ranged in 3.1-14.68 ng · L-1 and nd-14.54 ng · L-1. By comparison, the pollution level in urban rivers was much lower. The total concentration of ten antibiotics ranged in 20.1 ng · L-1 to 61.2 ng · L-1, among with tetracyclines varied from undetected to 44.0 ng · L-1, while sulfonamides, macrolides and quinolones were respectively below 2.7 ng · L-1, 6.3 ng · L-1 and 21.6 ng · L-1.


Shu X.-M.,Yangtze University | Shu X.-M.,Changzhou University | Xu C.-C.,Yangtze University | Wen X.-G.,Jiaxing University | And 5 more authors.
Huanjing Kexue/Environmental Science | Year: 2016

Iron scraps-Fenton-coagulation process was applied to chemical dyestuff wastewater. The removal performance of absorbable organic halogens(AOX), chroma and total organic carbon (TOC) was investigated at different molar ratios of Fe2+ to H2O2 (1∶3-1∶15), iron scraps reaction time (2-5 h) and Fenton reaction time (20-80 min). The results showed that the removal ratios of AOX, chroma and TOC firstly increased and then decreased with the decrease of the molar ratio of Fe2+ to H2O2, while continuously increased with the increase of iron scraps and Fenton reaction time. The optimal condition was determined as Fe2+∶H2O2 ratio of 1∶8, iron scraps reaction time of 4 h and Fenton reaction time of 60 min, under which 94.2% of AOX, 93.7% of chroma and 27.2% of TOC were removed. A comparison study revealed that the iron scraps-Fenton-coagulation combined process could achieve much better removal of AOX, chroma and TOC than any other single or combined processes of iron treatment, Fenton oxidation and coagulation. GC-MS analysis revealed that halogenated compounds and anilines were efficiently removed, as well as nitrobenzenes, phenols, benzaldehydes, ethers, nitriles and heterocyclic compounds. ·OH was found to devote much in the Fenton reaction according to the tert-butyl alcohol trapping hydroxyl radicals test. © 2016, Science Press. All right reserved.


Wang J.-F.,Zhejiang University of Technology | Zhou K.-J.,Zhejiang Province Environmental Monitoring Center | Wang X.-Q.,Zhejiang Province Environmental Monitoring Center | Deng J.,Zhejiang University of Technology | And 7 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2015

Available data of atmospheric nitrogen and phosphorous deposition during Sep, 2013 to Aug, 2014, were collected from three typical monitoring stations of Hang-Jia-Hu area, which are located at Hangzhou, Jiaxing andg Huzhou city respectively. The pollution characteristics of this area were discussed. Annual bulk deposition of nitrogen and phosphorous were significantly high in range of 4950.74~5585.80 and 65.25~69.72 kg/(km2·a); Atmospheric deposition of nitrogen, phosphorus into the water were 6038.4 and 77.8 tons, respectively, equivalent to 39.6% and 5.9% input amount of nitrogen and phosphorus by agricultural. The principal deposition form for nitrogen was wet deposition, while for and phosphorous, it was dry deposition. Wet deposition of nitrogen and phosphorous were affected by rainfall situation, and usually increased along with the rainfall amount. The spatial ariation characteristics of nitrogen and phosphorous showed that high dry atmospheric deposition of nitrogen (Hangzhou, Jiaxing), high dry atmospheric deposition of phosphorous (Jiaxing), high wet nitrogen deposition (Huzhou, Jiaxing), and high wet phosphorous of Huzhou. On the time scale, nitrogen deposition was much higher in summer and autumn, while phosphorus deposition was much higher in autumn and winter. ©, 2015, Chinese Society for Environmental Sciences. All right reserved.

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