scholarly journals Polychlorinated Biphenyls in the Centralized Wastewater Treatment Plant in a Chemical Industry Zone: Source, Distribution, and Removal

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Min Yao ◽  
Zhongjian Li ◽  
Xingwang Zhang ◽  
Lecheng Lei
Keyword(s):  
Wastewater Treatment ◽  
Polychlorinated Biphenyls ◽  
Chemical Industry ◽  
Wastewater Treatment Plant ◽  
Treatment Process ◽  
Solid Phase ◽  
Treatment Plant ◽  
Source Distribution ◽  
The Individual ◽  
Centralized Wastewater Treatment

Polychlorinated biphenyls (PCBs) could be dissolved in wastewater or adsorbed on particulate. The fate of PCBs in wastewater is essential to evaluate the feasibility of wastewater treatment processes and the environmental risk. Here dissolved and adsorbed concentrations of twenty concerned PCB congeners and total PCBs have been measured in the centralized wastewater treatment plant of a chemical industry zone in Zhejiang, China. It was found that the dyeing chemical processes were the main source of PCBs, which contributed more than 13.6%. The most abundant PCB was PCB-11 in the liquid and solid phase of each treatment stage, accounting for more than 60% of the total 209 PCBs. Partitioning behavior of PCBs between the dissolved and adsorbed phases suggested that Di-CBs were the dominant isomers (>70%) and more than 89.8% of them was adsorbed on the particles and sludge. The total removal efficiency of∑209 PCBs was only 23.2% throughout the whole treatment process. A weak correlation was obtained between the individual PCB concentration and their log Kowin primary sedimentation, anaerobic hydrolysis, aerobic bioprocess stage, and the whole treatment process.

Possible impact of treated wastewater discharge on incidence of antibiotic resistant bacteria in river water

2001 ◽  
Vol 43 (2) ◽  
pp. 91-99 ◽  
Author(s):  
T. Iwane ◽  
T. Urase ◽  
K. Yamamoto
Keyword(s):  
Wastewater Treatment ◽  
River Water ◽  
Wastewater Treatment Plant ◽  
Treatment Process ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Resistant Bacteria ◽  
Wastewater Discharge ◽  
Wastewater Treatment Process ◽  
Antibiotic Resistant

Escherichia coli and coliform group bacteria resistant to seven antibiotics were investigated in the Tama River, a typical urbanized river in Tokyo, Japan, and at a wastewater treatment plant located on the river. The percentages of antibiotic resistance in the wastewater effluent were, in most cases, higher than the percentages in the river water, which were observed increasing downstream. Since the possible increase in the percentages in the river was associated with treated wastewater discharges, it was concluded that the river, which is contaminated by treated wastewater with many kinds of pollutants, is also contaminated with antibiotic resistant coliform group bacteria and E.coli. The percentages of resistant bacteria in the wastewater treatment plant were mostly observed decreasing during the treatment process. It was also demonstrated that the percentages of resistance in raw sewage are significantly higher than those in the river water and that the wastewater treatment process investigated in this study works against most of resistant bacteria in sewage.

Volatile organic compound emissions during the composting of biosolids from a domestic wastewater treatment plant

2002 ◽  
Vol 46 (10) ◽  
pp. 195-198 ◽  
Author(s):  
C.X. Ramos ◽  
S.L. Estévez ◽  
E. Giraldo
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Solid Phase ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Aeration System ◽  
Domestic Wastewater Treatment ◽  
Emission Behavior ◽  
Volatile Organic Compound Emissions ◽  
Aliphatic And Aromatic Hydrocarbons

VOCs emitted by two composting static piles of biosolids coming from the “El Salitre” wastewater treatment plant (Bogotá, Colombia) were analysed during the composting process. Each pile in its sampling time was maintained with a different aeration system. The sampling was made using Solid Phase Microextraction (SPME); separation and identifications were made using Gas Chromatography (GC) coupled to Mass Spectrometry (MS). Aliphatic and aromatic hydrocarbons, chlorinated compounds, ketones, mercaptans, alcohols and amines were identified in concentrations greater than the norms stipulated by the EPA for inhalation in humans beings. The emission behavior varied according to the aeration system used.

scholarly journals Changes of Isotopic Composition in Gases Emitted from Wastewater Treatment Plant - Preliminary Study

2014 ◽  
Vol 21 (2) ◽  
pp. 245-254
Author(s):  
Wioleta Stelmach ◽  
Paweł Szarlip ◽  
Andrzej Trembaczowski
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Process ◽  
Treatment Plant ◽  
Nitrogen Isotope ◽  
Isotope Ratios ◽  
Biogenic Element ◽  
Municipal Wastewater Treatment ◽  
Carbon And Nitrogen

Abstract Investigations of processes occurring during wastewater treatment have progressed beyond the stage of technology. Currently, great numbers of representatives of diverse specialist research apply increasingly sophisticated measurement methods that have not been employed in this field of science. One of the methods is IRMS (Isotope Ratio Mass Spectrometry). Tracking changes in the ratios of biogenic element isotopes is useful in eg identification and monitoring of investigated processes. Since the IRMS technique has hardly been used for investigations of the wastewater treatment process, pilot research should be instigated to determine the isotope ratios occurring naturally in the process. The aim of the study was to determine changes in carbon and nitrogen isotope ratios at the successive stages of the technological line in wastewater treatment plants. The study material comprised: i) suspensions of raw sewage and mixtures of wastewater and activated sludge; ii) gases sampled from the volume of the suspensions; iii) gases sampled from the air above the suspension surface. The research material originated from the facilities of “Hajdow” municipal wastewater treatment plant in Lublin (SE Poland). The samples were analysed for the carbon and nitrogen isotope ratios, and the concentrations of the gases as well as total organic carbon (TOC), inorganic carbon (IC), Kjeldahl nitrogen (KN), dry weight, pH, and Eh were determined. The results obtained suggest that: i) the IRMS technique can be successfully applied in investigations of processes occurring during wastewater treatment; ii) isotope ratios in the carbon and nitrogen compounds (CO2 and N2) both in the suspensions and gases contained therein and in the air above them differ from each other and change at the different stages of the treatment process; iii) further research is indispensable in order to identify processes responsible for fractionation of carbon and nitrogen isotopes.

scholarly journals Novel Macrolide Resistance Module Carried by the IncP-1β Resistance Plasmid pRSB111, Isolated from a Wastewater Treatment Plant

2006 ◽  
Vol 51 (2) ◽  
pp. 673-678 ◽  
Author(s):  
Rafael Szczepanowski ◽  
Irene Krahn ◽  
Nadine Bohn ◽  
Alfred Pühler ◽  
Andreas Schlüter
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Transcriptional Regulator ◽  
Macrolide Resistance ◽  
Nucleotide Sequence Analysis ◽  
Inverted Repeats ◽  
Resistance Plasmid ◽  
The Individual ◽  
High Level

ABSTRACT The macrolide resistance plasmid pRSB111 was isolated from bacteria residing in the final effluents of a wastewater treatment plant. The 47-kb plasmid confers resistance to azithromycin, clarithromycin, erythromycin, roxithromycin, and tylosin when it is carried by Pseudomonas sp. strain B13 and is very similar to prototype IncP-1β plasmid pB3, which was previously isolated from an activated-sludge bacterial community of a wastewater treatment plant. The two plasmids differ in their accessory regions, located downstream of the conjugative transfer module gene traC. Nucleotide sequence analysis of the pRSB111 accessory region revealed that it contains a new macrolide resistance module composed of the genes mphR(E), mph(E), and mrx(E), which putatively encode a transcriptional regulator, a macrolide phosphotransferase, and a transmembrane transport protein, respectively. Analysis of the contributions of the individual genes of the macrolide resistance module revealed that mph(E) and mrx(E) are required for high-level macrolide resistance. The resistance genes are flanked by two insertion sequences, namely, ISPa15 and ISRSB111. Two truncated transposable elements, IS6100 and remnants of a Tn3-like transposon, were identified in the vicinity of ISRSB111. The accessory element of pRSB111 apparently replaced the Tn402-like element present on the sister plasmid, pB3, as suggested by the conservation of Tn402-specific terminal inverted repeats on pRSB111.

scholarly journals Odour reduction strategies for biosolids produced from a Western Australian wastewater treatment plant: results from Phase I laboratory trials

2013 ◽  
Vol 68 (12) ◽  
pp. 2552-2558 ◽  
Author(s):  
Yolanta Gruchlik ◽  
Anna Heitz ◽  
Cynthia Joll ◽  
Hanna Driessen ◽  
Lise Fouché ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Solid Phase ◽  
Treatment Plant ◽  
Gas Chromatography Mass Spectrometry ◽  
Sulphur Compounds ◽  
Volatile Sulphur Compounds ◽  
Volatile Organic ◽  
Reduction Strategies ◽  
Western Australian

This study investigated sources of odours from biosolids produced from a Western Australian wastewater treatment plant and examined possible strategies for odour reduction, specifically chemical additions and reduction of centrifuge speed on a laboratory scale. To identify the odorous compounds and assess the effectiveness of the odour reduction measures trialled in this study, headspace solid-phase microextraction gas chromatography-mass spectrometry (HS SPME-GC-MS) methods were developed. The target odour compounds included volatile sulphur compounds (e.g. dimethyl sulphide, dimethyl disulphide and dimethyl trisulphide) and other volatile organic compounds (e.g. toluene, ethylbenzene, styrene, p-cresol, indole and skatole). In our laboratory trials, aluminium sulphate added to anaerobically digested sludge prior to dewatering offered the best odour reduction strategy amongst the options that were investigated, resulting in approximately 40% reduction in the maximum concentration of the total volatile organic sulphur compounds, relative to control.

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