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https://www.readbyqxmd.com/read/28921257/energy-recovery-from-wastewater-treatment-plants-through-sludge-anaerobic-digestion-effect-of-low-organic-content-sludge
#1
Yuyao Zhang, Huan Li
During anaerobic digestion, low-organic-content sludge sometimes is used as feedstock, resulting in deteriorated digestion performance. The operational experience of conventional anaerobic digestion cannot be applied to this situation. To investigate the feature of low-organic-content sludge digestion and explain its intrinsic mechanism, batch experiments were conducted using designed feedstock having volatile solids (VS) contents that were 30-64% of total solids (TS). The results showed that the accumulative biogas yield declined proportionally from 173...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28919889/dehalococcoides-as-a-potential-biomarker-evidence-for-uncharacterized-organohalides-in-environmental-samples
#2
Qihong Lu, Ling Yu, Zhiwei Liang, Qingyun Yan, Zhili He, Tiangang Luan, Dawei Liang, Shanquan Wang
The massive production and improper disposal of organohalides resulted in worldwide contamination in soil and water. However, their environmental survey based on chromatographic methods was hindered by challenges in testing the extremely wide variety of organohalides. Dehalococcoides as obligate organohalide-respiring bacteria exclusively use organohalides as electron acceptors to support their growth, of which the presence could be coupled with organohalides and, therefore, could be employed as a biomarker of the organohalide pollution...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28919477/influence-of-microwave-heating-on-biogas-production-from-sida-hermaphrodita-silage
#3
Marcin Zieliński, Marcin Dębowski, Paulina Rusanowska
This study compared the effects on biogas production of suspended sludge versus a combination of suspended sludge and immobilized biomass, and microwave versus convection heating. Biogas production was the highest in the hybrid bioreactor heated by microwaves (385L/kg VS) and also the most stable, as shown by the FOS/TAC ratio and pH. Regardless of the type of heating, biogas production was 8% higher with immobilized biomass than without. Although the lag phase of biogas production was shorter with microwave heating than without, the log phase was longer, and biogas production in the microwave heated bioreactors took about twice as long (ca...
September 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28918708/removal-of-sulfadiazine-and-tetracycline-in-membrane-bioreactors-mbrs-linking-pathway-to-microbial-community-shift
#4
Ronghua Xu, Zhiyong Wu, Zhongbo Zhou, Fangang Meng
In this study, the removal pathway of sulfadiazine (SDZ) and tetracycline (TC) and their roles in shaping microbial community were separately explored in two lab-scale membrane bioreactors (MBRs) operating in parallel with one control MBR. Results show that the MBR system eliminated more than 90% of TC in the feed, whereas removal efficiency of SDZ decreased from 100% to 40% with increasing SDZ concentrations (1-1000 μg/L). Based on batch tests, biodegradation and adsorption was the main removal route for SDZ and TC, respectively...
September 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28918574/fecal-sludge-management-in-developing-urban-centers-a-review-on-the-collection-treatment-and-composting
#5
Emmanuel Alepu Odey, Zifu Li, Xiaoqin Zhou, Loissi Kalakodio
The problems posed by fecal sludge (FS) are multidimensional because most cities rapidly urbanize, which results in the increase in population, urban settlement, and waste generation. Issues concerning health and waste treatment have continued to create alarming situations. These issues had indeed interfered with the proper steps in managing FS, which contaminates the environment. FS can be used in agriculture as fertilizer because it is an excellent source of nutrients. The recent decline in crop production due to loss of soil organic component, erosion, and nutrient runoff has generated interest in the recycling of FS into soil nutrients through stabilization and composting...
September 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28918337/ecotoxicological-and-microbiological-assessment-of-sewage-sludge-associated-with-sugarcane-bagasse
#6
Lais Roberta Deroldo Sommaggio, Dânia Elisa Christofoletti Mazzeo, Débora de Andrade E Silva Sant' Anna, Carlos Emílio Levy, Maria Aparecida Marin-Morales
Sewage sludge (SS) obtained after sewage treatment process may contain several toxic substances. Bioremediation can decrease the toxicity of the sludge, mainly when it is associated with stimulant agents, such as sugarcane bagasse (B). Samples of pure SS (SSP); SS+B; SS+Soil; and SS+B+Soil were bioremediated for 1, 3, and 6 months (T1, T2, and T3, respectively). After each period, the cytotoxic, genotoxic, and mutagenic potentials of the solid samples and their respective aqueous extracts (aqueous eluate and percolate water) were evaluated by the Allium cepa test...
September 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28918080/the-tail-of-two-models-impact-of-circularity-and-biomass-non-homogeneity-on-uv-disinfection-of-wastewater-flocs
#7
Y Azimi, Y Liu, T C Tan, D G Allen, R R Farnood
The effects of floc structural characteristics, i.e. shape and dense biomass distribution, were evaluated on ultraviolet (UV) disinfection resistance, represented by the tailing level of the UV dose response curve (DRC). Ellipsoid-shaped flocs of similar volume and different projected circularities were constructed in-silico and a mathematical model was developed to compare their UV DRC tailing levels (indicative of UV-resistance). It was found that floc shape can significantly influence tailing level, and rounder flocs (i...
September 6, 2017: Water Research
https://www.readbyqxmd.com/read/28917199/enhanced-phosphorus-and-ciprofloxacin-removal-in-a-modified-baf-system-by-configuring-fe-c-micro-electrolysis-investigation-on-pollutants-removal-and-degradation-mechanisms
#8
Longlong Zhang, Qinyan Yue, Kunlun Yang, Pin Zhao, Baoyu Gao
A modified biological aerated filter (BAF) system configured Fe-C micro electrolysis was applied to enhance phosphorus and ciprofloxacin (CIP) removal. A novel sludge ceramic and sintering ferric-carbon ceramic (SFC) were separately packed into a lab-scale BAF and Fe-C micro electrolysis reactor. The BAF and Fe-C micro electrolysis coupled system was operated about 230days. The enhancement of phosphorus and ciprofloxacin removals by Fe-C micro electrolysis, the degradation mechanisms of CIP and the variations of microbial population were investigated...
September 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28917192/mass-loading-and-emission-of-thirty-seven-pharmaceuticals-in-a-typical-municipal-wastewater-treatment-plant-in-hunan-province-southern-china
#9
Huiju Lin, Haipu Li, Leilei Chen, Lei Li, Ling Yin, Hsiaowan Lee, Zhaoguang Yang
The occurrence, fate, mass loading and environmental emission of 37 pharmaceuticals were studied through an integrated approach involving both dissolved and adsorbed phase at a typical wastewater treatment plant in Hunan Province, Southern China. The results displayed the prevalence of 24 and 23 compounds in dissolved phase of influent and effluent, respectively. Fourteen compounds were found adsorbed onto sludge with a mean concentration ranging from 0.85 to 2900μg/kg dry weight. Twelve compounds exhibited high adsorption potential onto suspended particulate matter (SPM) with a mean fraction ranging from 8...
September 13, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28917117/anaerobic-granular-sludge-for-simultaneous-biomethanation-of-synthetic-wastewater-and-co-with-focus-on-the-identification-of-co-converting-microorganisms
#10
Yuhang Jing, Stefano Campanaro, Panagiotis Kougias, Laura Treu, Irini Angelidaki, Shicheng Zhang, Gang Luo
CO is a main component of syngas, which can be produced from the gasification of organic wastes and biomass. CO can be converted to methane by anaerobic digestion (AD), however, it is still challenging due to its toxicity to microorganisms and limited knowledge about CO converting microorganisms. In the present study, anaerobic granular sludge (AGS) was used for the simultaneous biomethanation of wastewater and CO. Batch experiments showed that AGS tolerated CO partial pressure as high as 0.5 atm without affecting its ability for synthetic wastewater degradation, which had higher tolerance of CO compared to suspended sludge (less than 0...
September 9, 2017: Water Research
https://www.readbyqxmd.com/read/28917102/performance-evaluation-and-microbial-community-shift-of-a-sequencing-batch-reactor-under-silica-nanoparticles-stress
#11
Shanshan Li, Shijiang Gao, Sen Wang, Bingrui Ma, Liang Guo, Zhiwei Li, Qiaoyan Xu, Zonglian She, Mengchun Gao, Yangguo Zhao, Feng Gao, Chunji Jin
The performance, microbial community and enzymatic activity of a sequencing batch reactor (SBR) were evaluated at different silica nanoparticles (SiO2 NPs) concentrations. SiO2 NPs concentration at 5-30mg/L had a slight inhibitory impact on the nitrogen and COD removals, whereas the phosphorus removal was obviously inhibited at 30mg/L SiO2 NPs. The rates of nitrification, nitrite reduction and phosphorus removal decreased with the increase of SiO2 NPs concentration. The nitrate reduction rate decreased at less than 5mg/L SiO2 NPs and subsequently showed an increase at 10-30mg/L SiO2 NPs...
September 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28916990/transformation-of-anaerobic-granules-into-aerobic-granules-and-the-succession-of-bacterial-community
#12
Haohao Sun, Ping Yu, Qiaoling Li, Hongqiang Ren, Bo Liu, Lin Ye, Xu-Xiang Zhang
In this study, we demonstrated that anaerobic granular sludge could be successfully transformed into aerobic granular sludge in a continuous up-flow reactor in 45 days. An aerobic microbial community successfully developed in the granules and high organic matter and nitrogen removal performance was achieved. Under an ammonia nitrogen loading rate of 0.8 kg N/(m(3) day), ammonia nitrogen and the total nitrogen removal efficiency of the reactor reached up to 100 and 93%, respectively. An obvious bacterial community shift in granular sludge was observed during the transformation process...
September 15, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28916959/potential-use-of-membrane-bioreactor-to-treat-petroleum-refinery-effluent-comprehension-of-dynamic-of-organic-matter-removal-fouling-characteristics-and-membrane-lifetime
#13
Aline R Alkmim, Paula R da Costa, Priscila B Moser, Luzia S França Neta, Vânia M J Santiago, Ana C Cerqueira, Beatriz G Reis, Míriam C S Amaral
This study aims to evaluate membrane bioreactor (MBR) performance in a pilot scale to treat petroleum refinery effluent, and has been primarily focused on (1) investigation of dynamics of organic matter removal; (2) characterization of membrane fouling under real hazardous events; (3) evaluation of the effect of fouling on membrane lifetime; and (4) estimate the membrane lifetime. The results have shown that the MBR was able to effectively reduce COD, NH3-N, turbidity, color, phenol and toxicity, and bring them to the levels required to meet disposal and non-potable water reuse standards...
September 15, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28915490/bioremoval-of-zinc-and-manganese-by-bacterial-biofilm-a-bioreactor-based-approach
#14
Trishna Pani, Anamika Das, Jabez Williams Osborne
Industrialization has led to the disposal of a massive amount of heavy metals every year, showing perilous effects on humans, marine life and agricultural products. There are numerous chemical and biological approaches available but their implementation is limited due to high cost and low efficiency. Therefore, the present study was focused on the biofilm- based bioremoval of heavy metals (zinc and manganese) using indigenous bacteria isolated from the tannery sludge obtained from Ranipet, Tamil Nadu. The effective isolate was capable of tolerating up to 2000mg/L of zinc and manganese and was further used for development of biofilm on the peels of Cucumis sativus...
September 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28915474/simultaneous-removal-of-cadmium-zinc-and-manganese-using-electrocoagulation-influence-of-operating-parameters-and-electrolyte-nature
#15
Longqian Xu, Guangzhu Cao, Xiaojun Xu, Shuli Liu, Zhengyang Duan, Changhua He, Yao Wang, Qihua Huang
In the present study, the influence of operating parameters and electrolyte nature on the simultaneous removal of toxic metals (cadmium, zinc and manganese) from synthetic smelting wastewater by batch electrocoagulation was investigated. This wastewater contained high concentrations of anion-cation electrolytes. Results indicated that the efficiency of heavy metals removal can be enhanced by increasing the solution pH and current density. The Fe-Fe electrode combination is more effective than the other combinations (Al-Al, Al-Fe and Fe-Al)...
September 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28915379/study-on-the-oxygen-reduction-reaction-catalyzed-by-a-cold-tolerant-marine-strain-phylogenetically-related-to-erythrobacter-citreus
#16
Lianqiang Li, Fei Ding, Lin Sang, Jiaquan Liu, Duolu Mao, Xingjiang Liu, Qiang Xu
As the development of marine economy, the submarine battery with the seawater electrolyte has obtained more and more attentions. Owing to the conventional electrochemical catalysts of the cathodes in seawater battery are expensive, it is to seek the new biological catalysts to improve the electrochemical performance of the cathode and reduce the cost of seawater battery. A novel marine bacterial strain (Strain SQ-32) phylogenetically related to the Erythrobactercitreus strain has been isolated from the sea-bed sludge in the Yellow Sea of China successfully...
September 8, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28913724/use-of-phytoproductivity-data-in-the-choice-of-native-plant-species-to-restore-a-degraded-coal-mining-site-amended-with-a-stabilized-industrial-organic-sludge
#17
Claudete G Chiochetta, Hela Toumi, Renata F S Böhm, Fernanda Engel, Gabriel Poyer-Radetski, Leonardo R Rörig, Fabrizio Adani, Claudemir M Radetski
Coal mining-related activities result in a degraded landscape and sites associated with large amounts of dumped waste material. The arid soil resulting from acid mine drainage affects terrestrial and aquatic ecosystems, and thus, site remediation programs must be implemented to mitigate this sequential deleterious processes. A low-cost alternative material to counterbalance the affected physico-chemical-microbiological aspects of the degraded soil is the amendment with low contaminated and stabilized industrial organic sludge...
September 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28913636/gelidibacter-flavus-sp-nov-isolated-from-activated-sludge-of-seawater-treatment-system
#18
Hyun-Sook Kim, John J Bang, Sang-Seob Lee
A Gram-stain-negative bacterial strain designated Con4(T) was isolated from activated sludge in a seawater treatment system. The strain was rod-shaped, motile, aerobic, and formed yellow-colored colonies on agar medium. Cells contained carotenoid pigments, but flexirubin-type pigments were absent. Based on 16S rRNA gene sequence analysis, the strain was assigned to the genus Gelidibacter. Optimum growth occurred at 20 °C, pH 7.0, and 1-2% (w/v) NaCl. Prominent fatty acid types were iso-C15:0, anteiso-C15:0, and iso-C16:0 3OH...
September 14, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28913581/investigation-on-the-anaerobic-co-digestion-of-food-waste-with-sewage-sludge
#19
Yubo Wang, Chunxiao Wang, Yulin Wang, Yu Xia, Guanghao Chen, Tong Zhang
In this laboratory-scale investigation on the applicability of the co-digestion of food waste with sewage sludge, evaluated were the effects of the single-stage versus two-stage operating modes at the hydraulic retention time (HRT) of 15 days, and the impact of HRTs: 15 days vs. 25 days, on the single-stage operation. An average volatile solid reduction (VSR) of 61% and methane yield of 314 ml/g-VS were achieved in the two-stage operation (HRT 15 days), while comparable VSR of 57% and the methane yield of 325 ml CH4/g-VS could only be detected at a longer HRT at 25 days in the single-stage operation...
September 14, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28912079/solid-anaerobic-digestion-state-of-art-scientific-and-technological-hurdles
#20
REVIEW
Laura André, André Pauss, Thierry Ribeiro
In this paper, a state-of-art about solid anaerobic digestion (AD), focused on recent progress and trends of research is proposed. Solid anaerobic digestion should be the most appropriate process for degradation of by-products with high total solid (TS) content, especially lignocellulosic materials like agricultural waste (straw, manure), household waste and food waste. Solid AD is already widely used in waste water treatment plant for treating plant for sewage sludge but could be more developed for lignocellulosic materials with high TS content...
September 5, 2017: Bioresource Technology
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