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Environmental Technology

Shizong Wang, Jianlong Wang
Triclosan is an extensively applied antimicrobial agent which has been frequently detected in the environment. In this paper, the degradation of triclosan and its main intermediates was investigated during the combined irradiation and biological treatment. The results showed that triclosan degradation increased with increase of absorbed dose, the removal efficiency of triclosan was 62%, 77%, 87%, 91% and 94%, respectively at 1, 2, 3, 4 and 5 kGy. The final removal efficiency of triclosan after the combined irradiation and biological process were 81%, 86%, 90%, 92% and 95%, respectively...
April 24, 2017: Environmental Technology
R C S Nascimento, A O S Silva, L Meili
Modified versions of MCM-41 and SBA-15 were obtained from sucrose by carbon deposition. The ability of the resulting materials, MCM-41 CC and SBA-15 CC, to remove Rhodamine B from aqueous solutions was evaluated. TG/DTG, XRD, Nitrogen Adsorption (BET), and SEM were used to characterize the materials. Adsorption was investigated by finite bath studies. To characterize the adsorption behavior and mechanism, kinetics and equilibrium were assessed. MCM-41 CC provided the best adsorption results: adsorptive capacity of 11...
April 20, 2017: Environmental Technology
Rajoo Balaji, Hing Lee Siang, Omar Yaakob, Kho King Koh, Faizul Amri Bin Adnan, Nasrudin Bin Ismail, Badruzzaman Bin Ahmad, Mohd Arif Bin Ismail, W B Wan Nik
Waste heat recovery from shipboard machineries could be a potential source for heat treatment of ballast water. Similar to a shipboard schematic arrangement, a laboratory-scale engine-heat exchanger set-up harvesting waste heat from jacket water and exhaust gases was erected to test the level of species' mortalities. Mortalities were also assessed under experimental conditions for cultured and natural plankton communities at laboratory level. Effect of pump impellers on species' mortalities were also tested...
April 20, 2017: Environmental Technology
Shervin Hashemi, Mooyoung Han
As a principle of resource-oriented sanitation practice, urine should be separated from the source and utilized for other purposes such as producing fertilizer. This is because urine is rich in nutrients; therefore, sending it directly to wastewater treatment plants causes problems in the regular treatment process. The addition of solid additives such as powdered rice straw can help with harvesting nutrients from urine. In this study, the procedure and efficiency of using powdered rice straw for nutrient harvesting were investigated by tracking the reductions in ammonia, phosphate, magnesium, and calcium ions, and the harvested nutrients were identified using crystallography methods...
April 20, 2017: Environmental Technology
Wai Lam, Yujie Wang, Pui Ling Chan, Shun Wan Chan, Yiu Fai Tsang, Hong Chua, Peter Hoi Fu Yu
In this study, seven strains of bacteria with polyhydroxyalkanoates (PHA)-producing ability (i.e. Bacillus cereus, Pseudomonas putida, Bacillus pumilus, Pseudomona huttiensis, Yersinia frederiksenii, Aeromonas ichthiosmia, and Sphingopyxis terrae) were isolated from various waste treatment plants in Hong Kong. Simultaneous wastewater treatment and PHA accumulation were successfully achieved in the bioreactors using isolated bacteria from different sludges. At the organic loading less than 13,000 ppm, more than 95% of chemical oxygen demand (COD) was removed by the isolated strains before the decrease of PHA accumulation...
April 20, 2017: Environmental Technology
Naoki Nomoto, Muntjeer Ali, Komal Jayaswal, Akinori Iguchi, Masashi Hatamoto, Tsutomu Okubo, Masanobu Takahashi, Kengo Kubota, Tadashi Tagawa, Shigeki Uemura, Takashi Yamaguchi, Hideki Harada
Profile analysis of the down-flow hanging sponge (DHS) reactor was conducted under various temperature and organic load conditions to understand the organic removal and nitrification process for sewage treatment. Under high organic load conditions (3.21-7.89 kg-COD m(-3 )day(-1)), dissolved oxygen (DO) on the upper layer of the reactor was affected by organic matter concentration and water temperature, and sometimes reaches around zero. Almost half of the CODCr was removed by the first layer, which could be attributed to the adsorption of organic matter on sponge media...
April 20, 2017: Environmental Technology
Habib Chouchane, Mouna Mahjoubi, Besma Ettoumi, Mohamed Neifar, Ameur Cherif
A new bioflocculant named pKr produced by hydrocarbonoclastic strain Kocuria rosea BU22S (KC152976) was investigated. Gas chromatography-flame ionization detector (GC-FID) analysis confirmed the high potential of the strain BU22S in the degradation of n-alkanes. Plackett-Burman experimental design and response surface methodology were carried out to optimize pKr production. Glucose, peptone and incubation time were found to be the most significant factors affecting bioflocculant production. Maximum pKr production was about 4...
April 20, 2017: Environmental Technology
Pei-Fang Tee, Mohammad Omar Abdullah, Ivy A W Tan, Mohamed A M Amin, Cirilo Nolasco-Hipolito, Kopli Bujang
A microbial fuel cell (MFC) intergrated with adsorption system (MFC-AHS) are tested under various operating tempartures with palm oil mill effluent (POME) as the substrate. The optimum operating temperature for such system is found to be at ∼ 35°C with current, power density, internal resistance (Rin), coulombic efficiency (CE) and maximum chemical oxygen demand (COD) removal of 2.51 ± 0.2 mA, 74 ± 6 mW m(-3), 25.4 Ω, 10.65 ± 0.5% and 93.57 ± 1.2%, respectively. Maximum current density increase linearly with temperature at a rate of 0...
April 18, 2017: Environmental Technology
Mohammad A Behnajady, Hojjat Dadkhah, Hamed Eskandarloo
In this study, a horizontally rotating disc recirculated (HRDR) photoreactor equipped with two UV lamps (6 W) was designed and fabricated for photocatalytic removal of p-Nitrophenol (PNP). Photocatalyst (TiO2) nanoparticles were immobilized onto a polyethylene disc, and PNP containing solution was allowed to flow (flow rate of 310 mL min(-1)) in radial direction along the surface of the rotating disc illuminated with UV light. The efficiency of direct photolysis and photocatalysis and the effect of rotating speed on the removal of PNP were studied in the HRDR photoreactor...
April 17, 2017: Environmental Technology
Kati Mustonen, Ivan Deviatkin, Jouni Havukainen, Mika Horttanainen
An ongoing call to implement a circular economy is underway in the European Union, and a specific attention has been placed on the forest industry, which seeks additional recycling routes for its side streams, including biosludge. Biosludge is often dried and incinerated, thus wasting the nitrogen contained therein. This paper describes a study in which the release of nitrogen during thermal drying; the impact of the drying temperatures of 130, 180, and 210°C on the mass of ammonia released; and the potential for recovery of nitrogen from biosludge were examined...
April 17, 2017: Environmental Technology
Yuepeng Sun, Huoqing Wang, Guangxue Wu, Yuntao Guan
The multiple anoxic and aerobic (AO) process is an advanced biological nitrogen-removal process, and nitrous oxide (N2O) emission might affect its sustainable application. Nitrogen removal and N2O emission in a step-feeding multiple AO sequencing batch reactor (SBRS) was examined, in comparison with a one-feeding sequencing batch reactor (SBRO). Nitrogen removal was enhanced by 12.6% in SBRS compared to the removal percentage of 75.8% in SBRO. Activated sludge in SBRs possessed a higher N2O emission factor during nitrification, denitrification and simultaneous nitrification and denitrification (SND) than in SBRO...
April 17, 2017: Environmental Technology
Jacobo Tabla-Hernandez, E Lopez-Galvan
The aim of the present work was to study the effect of packing material on the organic matter removal efficiency (OMRE) in an anaerobic-aerobic baffled bioreactor (AAB). For this purpose, two different experiments were conducted with two types of packing material: activated carbon particles (AC) and polyurethane foam (PF). The system consisted of two treatments; the first one was anaerobic, where it took place hydrolysis, acetogenesis and methanogenesis. In anaerobic chambers, there were no packing material and the operating conditions were the same in both experiments...
April 13, 2017: Environmental Technology
Sanna Hokkanen, Amit Bhatnagar, Ari Koistinen, Teija Kangas, Ulla Lassi, Mika Sillanpää
In the present study, the adsorption of sulfates of sodium sulfate (Na2SO4) and sodium lauryl sulfate (SLS) by calcium hydroxyapatite (CHA) modified microfibrillated cellulose (MFC) was studied in the aqueous solution. The adsorbent was characterized using elemental analysis, Fourier transform infrared (FTIR), scanning electron microscope (SEM) and elemental analysis in order to gain the information on its structure and physico-chemical properties. The adsorption studies were conducted in batch mode. The effects of solution pH, contact time, the initial concentration of sulfate and the effect of competing anions were studied on the performance of synthesized adsorbent for sulfate removal...
April 13, 2017: Environmental Technology
Yang Yu, Huangzhao Wei, Yonghui Yu, Li Yu, Sen Wang, Chenglin Sun
Calcium compounds have been known to be important to enhance the aggregation and dewaterability of activated sludge. In this study, effect of calcium compounds (CaO, Ca(OH)2, CaCl2, CaSO4 and CaCO3, respectively) on sludge dewaterability and calorific value was investigated. Addition of CaO, Ca(OH)2, CaCl2, CaSO4 and CaCO3 (112 mg/g dry sludge) into activated sludge, after compressed filtration the moisture content of sludge was 49.7%, 55.7%, 57.1%, 65.3% and 56.5%, respectively. The addition of calcium compounds altered the structure of sludge by CaCO3 and Ca(OH)2 production, which improved sludge filterability and provided frameworks and water passages during compression...
April 12, 2017: Environmental Technology
Alireza Bazargan, Sarah L Rough, Gordon McKay
Palm kernel shell biochars (PKSB) ejected as residues from a gasifier have been used for solid fuel briquette production. With this approach, palm kernel shells can be used for energy production twice: first, by producing rich syngas during gasification; second, by compacting the leftover residues from gasification into high calorific value briquettes. Herein, the process parameters for the manufacture of PKSB biomass briquettes via compaction are optimized. Two possible optimum process scenarios are considered...
April 12, 2017: Environmental Technology
Ling Zhang, SuWan Jin, Yong Wang, Jiang Ji
In this study, a novel adsorbent of expanded graphite (EG) loaded with lanthanum (III)-iron (III) hydroxide (EG-LaFe) was prepared for phosphate removal. The single-factor of oscillating time, La/Fe molar ratio and total concentration of EG-LaFe were studied for optimization of preparation conditions. Effects of contact time, initial phosphate concentration, adsorption temperature and coexisting ions on the phosphate removal performance of EG-LaFe were investigated in detail. Adsorption kinetics and isothermal adsorption studies showed that the pseudo-second-order and the Langmuir model fitted the experimental data quite well...
April 10, 2017: Environmental Technology
S Fudala-Ksiazek, E Kulbat, A Luczkiewicz
This study focuses on the possible use and efficacy of the co-treatment of landfill leachate (intermediate-age) with municipal wastewater. The nitrification, denitrification and dephosphatation capability of activated sludge acclimated with a mixture of raw municipal wastewater (RWW) with gradually increasing amounts of raw landfill leachate (RLL) (from 0.5 to 5% v/v) were tested. Biochemical tests were performed simultaneously in batch reactors (BRs). According to the obtained data, the ammonia utilization rate (AUR) was 3...
April 10, 2017: Environmental Technology
Nima Habashi, Abolghasem Alighardashi, Artur Mennerich, Nasser Mehrdadi, Ali Torabian
Hydrodynamic cavitation (HC) was evaluated as a pre-treatment for synthetic oily wastewater (OWW) to be co-digested with waste activated sludge (WAS). The main objective of present research was the enhancement of biogas production by application of HC pre-treatment. HC was applied to the OWW and the OWW and WAS were added to a 50 L continuous digestion reactor. As a control system, an identical digestion reactor was set up for co-digestion of the WAS and the OWW without pre-treatment. The reactors were initially filled with inoculum and the hydraulic retention time (HRT) was set to 22 d...
April 10, 2017: Environmental Technology
Chenru Li, Kun Qian, Qinyao Liu, Qianyi Zhang, Chen Yao, Wei Song, Yihong Wang
Benzimidazole is an important intermediate in pharmaceutical and dyeing industry and it is usually difficult to be degraded by many treatment technologies. Looking for a highly effective, low cost, environment-friendly degradation process for wastewater containing these compounds is of great significance to reduce environmental pollution. Based on the structure of benzimidazole substances and analysis of varies treatment techniques, the micro-electrolysis (ME) coupled with Fenton technique was chosen to degrade those industrial benzimidazole wastewater with high chemical oxygen demand (COD)...
April 10, 2017: Environmental Technology
Peitao Zhao, Tian Li, Weijie Yan, Longji Yuan
Some chemicals were usually utilized in the hydrothermal dechlorination (HTD) of chlorine-containing wastes without revealing their roles. This work intends to investigate the role of chemical additives in the HTD of PVC (polyvinyl chloride). Several chemicals, including Na2CO3, KOH, NaOH, NH3·H2O, CaO and NaHCO3, were added into the PVC HTD process, which was conducted in subcritical Ni(2+)-containing water at 220 °C for 30 min. The results show the alkalinity of additives had notable effects on the dechlorination efficiency (DE) of PVC due to the neutralization between HCl and additives...
April 10, 2017: Environmental Technology
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