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Environmental Technology

Juliana M Schöntag, Alcione A Alves, Luis G Romero Esquivel, Maurício L Sens
Population growth requires more food production and as a consequence, there is the indiscriminate use of agrochemicals, among them major group are carbamates. At times, runoff of pesticides leads to surface water pollution that serves as a source of public supply. Thus, the presence of these microcontaminants in surface water has become increasingly frequent. The treatment developed in this work uses the principle of adsorption as a technology for the removal of carbamates, more specifically carbofuran. Two methods of coating the polystyrene beads with iron oxide were used to adsorb these microcontaminants from the water...
March 21, 2018: Environmental Technology
Sonda Guermazi-Toumi, Rakia Chouari, Abdelghani Sghir
Knowledge of archaeal population structure, function and interactions is of great interest for a deeper understanding of the anaerobic digestion step in wastewater treatment process, that represents a bottle neck in the optimization of digesters performance. Although culture-independent techniques have enabled the exploration of archaeal population in such systems, their population dynamics and interactions still require further investigation. In the present study, 2646 almost full archaeal 16S rRNA gene sequences retrieved from 22 anaerobic digesters located worldwide were analyzed and classified into 83 Operational Taxonomic Units (OTUs) for Euryarchaeotes and 2 OTUs for Crenarchaeotes...
March 21, 2018: Environmental Technology
Steffen Engelbrecht, Mohammad Mozooni, Kristina Rathsack, Jörg Böllmannm, Marion Martienssen
The Anammox process is an efficient low energy alternative for the elimination of nitrogen from wastewater. The process is already in use for side stream applications. However, some industrial wastewaters e.g. from textile industry are highly saline. This may be a limit for the application of the Anammox process. The aim of this study was to evaluate the effects of different NaCl concentrations to the efficiency of adapted and non-adapted Anammox biofilms. The tested NaCl concentrations ranged from 0 to 50 g NaCl*L-1 ...
March 21, 2018: Environmental Technology
Edward J Behrman
No abstract text is available yet for this article.
March 21, 2018: Environmental Technology
Ahmed Farghaly, Sophie Le Roux, Pascal Peu, Patrick Dabert, Ahmed Tawfik
The aim of this study is to highlight the robustness and potentials of the anaerobic baffled reactor (ABR) configuration on keeping the microbial richness and diversity after starvation period of 7 days. The module at steady state operating conditions provided an average volumetric hydrogen production (VHP) of 0.2±0.08 and 0.423±0.5 l/d in the 1st and last compartment (C4). The VHP was gradually decreased from 0.2 to 0.003 l/d and from 0.423 to 0.1 l/d in compartments (C1 and C4) respectively during feed less period...
March 20, 2018: Environmental Technology
Ge Li, Baodong Wang, Wayne Qiang Xu, Yonglong Li, Yifan Han, Qi Sun
Nitrogen oxides (NOx ) and sulfur dioxide (SO2 ) are major air pollutants, so simultaneously removing them from gases emitted during fossil fuel combustion in stationary systems is important. Wet denitrification using urea is used for a wide range of systems. Additives have strong effects on wet denitrification using urea, and different mechanisms are involved and different effects found using different additives. In this study, the effects of different additives, initial urea concentrations, reaction temperatures, initial pH values, gas flow rates, and reaction times on the simultaneous desulfurization and denitrification efficiencies achieved using wet denitrification using urea were studied in single factor experiment...
March 20, 2018: Environmental Technology
Tayebe Abdollahzadeh, Ali Niazi, Ali Moghadam, Zohreh Heydarian, Reza Ghasemi-Fasaei, Elina Kaviani, Neda Pourdad
Petroleum compounds are considered as one of the critical environmental pollutants. Salicornia can grow in petroleum-contaminated soil. Therefore, the potential of two Iranian Salicornia species, S. persica Akhani and S. iranica Akhani, for phytoremediation of soils contaminated with 0.2% and 2% petroleum contaminations was evaluated over the short (1 and 10 h) and long (100 days) periods of time. In addition, some key factors involved in phytoremediation including the expression analysis of phytoene synthase, physiological and morphological factors were studied...
March 20, 2018: Environmental Technology
Namita Maharjan, Naoki Nomoto, Tadashi Tagawa, Tsutomu Okubo, Shigeki Uemura, Nadeem Khalil, Masashi Hatamoto, Takashi Yamaguchi, Hideki Harada
This paper assesses the technical and economic sustainability of a combined system of an upflow anaerobic sludge blanket (UASB)- down-flow hanging sponge (DHS) for sewage treatment. Additionally, this study compares UASB-DHS with current technologies in India like trickling filters (TF), sequencing batch reactor (SBR), moving bed biofilm reactor (MBBR), and other combinations of UASB with post-treatment systems such as final polishing ponds (FPU) and extended aeration sludge process (EASP). The sustainability of the sewage treatment plants (STPs) was evaluated using a composite indicator, which incorporated environmental, societal and economic dimensions...
March 20, 2018: Environmental Technology
Hao Bai, Rong Zhu, Hao An, Guoya Zhou, Hui Huang, Hongqiang Ren, Yan Zhang
Although the properties of municipal wastewater sludge play key roles in the electro-osmosis dewatering process, it is still controversial which properties have the greatest effect on the dewatering performance. In this study, multiple regression models with Group Lasso method were used to investigate the relationship between the final moisture content (FMC) and the sludge properties, including pH, electrical conductivity (EC), volatile solids content (VS), zeta potential (ζ), initial moisture content (IMC), extracellular polymeric substances (EPS), proteins of EPS (EPSPr), polysaccharides of EPS (EPSPo) and the ratio of EPSPr and EPSPo (EPSR)...
March 20, 2018: Environmental Technology
S Thiyagarajan, V Edwin Geo, Leenus Jesu Martin, B Nagalingam
This experimental study aims to mitigate harmful emissions from a CI engine using bio-energy with carbon capture and storage (BECCS) approach. The engine used for this experimental work is a single cylinder CI engine with a rated power of 5.2 kW at a constant speed of 1500 rpm. The BECCS approach is a combination of plant-based biofuels and carbon capture and storage system. The whole investigation was done in four phases: (1) Substituting diesel with Karanja oil methyl ester (KOME) (2) Equal volume blending of Orange oil (ORG) with KOME (3) 20% blending of n-butanol (B) with KOME-ORG blend (4) Carbon capture and storage (CCS) system with zeolite based non-selective catalytic reduction (NSCR) and mono ethanolamine (MEA) based selective non-catalytic reduction (SNCR) system with KOME-ORG + B20 blend...
March 15, 2018: Environmental Technology
Pei Biao, Chen Junjie, Liu Peng, He Tao, Li Xuemei, Zhang Lin
Generally, conventional polyamide reverse osmosis (RO) membranes suffer from a low water flux and serious oil pollution in the treatment of oil saline wastewater. Here, a novel RO membrane was successfully fabricated with hyperbranched polyamidoamine (PAMAM) and trimesoyl chloride (TMC) by interfacial reaction on polysulfone ultrafiltration membrane surface. The relatively smooth and thin PAMAM and TMC crosslinking active layer on the substrate membrane endowed the composite membrane with an excellent separation performance and remarkable anti-fouling performance simultaneously...
March 14, 2018: Environmental Technology
Simon Bengtsson, Mark de Blois, Britt-Marie Wilén, David Gustavsson
The aerobic granular sludge (AGS) technology is growing towards becoming a mature option for new municipal wastewater treatment plants and capacity extensions. A process based on AGS was compared to conventional activated sludge processes (with and without enhanced biological phosphorus removal), an integrated fixed-film activated sludge (IFAS) process and a membrane bioreactor (MBR) by estimating the land area demand (foot-print), electricity demand and chemicals consumption. The process alternatives compared included pre-settling, sludge digestion and necessary post-treatment to achieve effluent concentrations of 8 mg/L nitrogen and 0...
March 13, 2018: Environmental Technology
Christian Manera, Andrezza Piroli Tonello, Daniele Perondi, Marcelo Godinho
In this work, the adsorption of Acid Black 210 (AB210) and Acid Red 357 (AR357) onto activated carbon prepared from leather shaving wastes (ACLW) was investigated. The activated carbon presented a surface area of 800.4 m²/g with an average pore size of 1.27 nm. The kinetic study showed that the adsorption of both dyes followed the Elovich kinetic model while the AB210 and AR357 isotherm data were well described by the Langmuir and BET models, respectively. Furthermore, the Boyd plot revealed that the adsorption of the leather dyes on activated carbon was mainly governed by film diffusion...
March 13, 2018: Environmental Technology
Arturo Cadena Ramírez, Anne-Claire Texier, Ignacio González, Jorge Gómez Hernández
The effect of three electric potentials (EP) (+104 mV, -187 mV and -279 mV) applied to denitrifying process was explored. It was observed that the denitrifying sludge was able to support the oxidation of p-cresol with the application of the EP in the absence of nitrate, but it was unable to drive the denitrification without an organic electron donor. On denitrification, the applied EP uncoupled the oxidative from the reductive process, favoring the p-cresol oxidation over the production of N2 . Additionally biochemical level effects were observed...
March 8, 2018: Environmental Technology
Ma Shuangchen, Chai Jin, Wu Kai, Xiang Yajun, Jia Shaoguang, Li Qingsong
Zero liquid discharge (ZLD) of wastewater has become the trend of environmental governance after the implementation of "The Action Plan for Prevention and Treatment of Water Pollution" in China, desulfurization wastewater is paid more concerns due to its complex composition and heavy metals. However, current technologies for ZLD have some shortcomings such as high cost and insufficient processing capacity, ZLD cannot be achieved actually. This paper proposes a new evaporation drying technology. An independent bypass evaporation tower was built, part of the hot flue gas before the air preheater was introduced into the evaporation tower for desulfurization wastewater evaporation, and the generated dust after evaporation was discharged back to the flue duct before ESP...
March 7, 2018: Environmental Technology
Bin Huang, Zhongwu Li, Dingqiang Li, Zaijian Yuan, Xiaodong Nie, Jinquan Huang, Yaoyu Zhou
Immobilization method using amendments is a very effective way of remediating heavy metal polluted soil. Passivator types and ambient conditions, such as moisture regimes, are the main factors affecting the immobilization efficiency. In this study, the immobilization of cadmium (Cd) was evaluated in red paddy soil amended with four different passivators (biochar, lime (CaO), calcium dihydrogen phosphate (Ca(H2 PO4 )2 ) and zeolite (modified with NaOH)) for three moisture regimes (70% water-holding capacity (WHC), continuous flooding (CF) and wetting-drying cycle (WDC))...
March 7, 2018: Environmental Technology
Jing Wang, Kangmin Chon, Xianghao Ren, Haizhong Wu, Yingying Kou, Moon-Hyun Hwang, Kyu-Jung Chae
In this study, the effects of polymeric ferric sulfate (PFS) and chitosan (CTS) on the dewatering characteristics of the digested activated sludge (e.g., filtrate turbidity, specific resistance of filtration (SRF), and cake moisture content) were investigated. The combined conditioning of PFS and CTS improved the settleability of the digested sludge more effectively than when using of PFS alone. The SRF value of the digested sludge decreased to 2.08 × 1012 m/kg after conditioning with 50 mg/g PFS and 10 mg/g CTS...
March 7, 2018: Environmental Technology
Weihua Wang, Wanfeng Zhang, Hong Liang, Dawen Gao
A method was established for coupled solid phase extraction-ultra performance liquid chromatography and mass spectrometry, to simultaneously detect 12 common antibiotics belonging to 4 types (sulfonamides, macrolides, fluoroquinolones and cephalosporins) in surface water environments. The characteristic distribution and seasonal variation in antibiotic content was investigated in the Harbin section of the Songhua River basin, Northeastern China. The results showed that the 12 antibiotics monitored were all detected to varying degrees, with 100% detection rates for sulfamethoxazole (SMX), cefazolin (CFZ), ofloxacin (OFL), flumequine (FLU), azithromycin (AZI) and roxithromycin (ROX) in all sampling sites...
March 7, 2018: Environmental Technology
Bing Liu, Li Gu, Qingfei Li, Guozhong Yu, Chengmei Zhao, Huimin Zhai
Municipal wastewater treatment plant (WWTP) effluent is increasingly used as reclaimed water and as water sources for downstream areas. Effluent dissolved organic nitrogen (DON) is considered to be the precursor to nitrogen disinfection by-products (N-DBPs), which have come into increasing focus due to environmental and public health risks associated with them. Here, we investigated DON removal by pre-ozonation enhanced coagulation and found that: (1) pre-ozonation significantly enhanced the removal of DON, DOC and UV254 by coagulation...
March 7, 2018: Environmental Technology
Sanjeev Sangami, Basavaraju Manu
In this work, low cost, locally available laterite based iron nanoparticles were synthesized using Tectona Grandis extract (Teak extract) with an average size of 75nm. The synthesized FeNPs were applied as a heterogeneous Fenton catalyst for the oxidation of mixture herbicides namely ametryn, dicamba and 2,4-D in water. The FeNPs were characterized for various analytical methods (FESEM-EDX, XRD, FTIR and BET) and the effect of different variables (FeNPs dosage, H2 O2 , pH) was studied using responses surface methodology...
March 7, 2018: Environmental Technology
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