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https://www.readbyqxmd.com/read/29334648/using-mass-struvite-precipitation-to-remove-recalcitrant-nutrients-and-micropollutants-from-anaerobic-digestion-dewatering-centrate
#1
M Abel-Denee, T Abbott, C Eskicioglu
The primary objective of this research was to remove recalcitrant nutrients from anaerobically digested sludge dewatering centrate. A struvite precipitation methodology is proposed where salt crystals are encouraged to ballast colloidal particles through heterogeneous nucleation and subsequent crystal growth. The secondary objective was to assess presence of micropollutants in precipitates. Four biologically unique dewatering centrates were used to test the precipitation methodology on the variety of anaerobic digester configurations that can be expected from municipal wastewater treatment plant...
January 5, 2018: Water Research
https://www.readbyqxmd.com/read/29331913/speciation-evolution-of-zinc-and-copper-during-pyrolysis-and-hydrothermal-carbonization-treatments-of-sewage-sludges
#2
Rixiang Huang, Bei Zhang, Emily M Saad, Ellery D Ingall, Yuanzhi Tang
Thermal and hydrothermal treatments are promising techniques for sewage sludge management that can potentially facilitate safe waste disposal, energy recovery, and nutrient recovery/recycling. Content and speciation of heavy metals in the treatment products affect the potential environmental risks upon sludge disposal and/or application of the treatment products. Therefore, it is important to study the speciation transformation of heavy metals and the effects of treatment conditions. By combining synchrotron X-ray spectroscopy/microscopy analysis and sequential chemical extraction, this study systematically characterized the speciation of Zn and Cu in municipal sewage sludges and their chars derived from pyrolysis (a representative thermal treatment technique) and hydrothermal carbonization (HTC; a representative hydrothermal treatment technique)...
January 4, 2018: Water Research
https://www.readbyqxmd.com/read/29331910/review-of-synthetic-human-faeces-and-faecal-sludge-for-sanitation-and-wastewater-research
#3
REVIEW
Roni Penn, Barbara J Ward, Linda Strande, Max Maurer
Investigations involving human faeces and faecal sludge are of great importance for urban sanitation, such as operation and maintenance of sewer systems, or implementation of faecal sludge management. However, working with real faecal matter is difficult as it not only involves working with a pathogenic, malodorous material but also individual faeces and faecal sludge samples are highly variable, making it difficult to execute repeatable experiments. Synthetic faeces and faecal sludge can provide consistently reproducible substrate and alleviate these challenges...
December 30, 2017: Water Research
https://www.readbyqxmd.com/read/29331853/mobility-of-heavy-metals-in-sandy-soil-after-application-of-composts-produced-from-maize-straw-sewage-sludge-and-biochar
#4
K Gondek, M Mierzwa-Hersztek, M Kopeć
Studies on the availability of heavy metals in composted organic materials and in soil amended with these materials are of practical significance. They are used in the assessment of the purity of the soil environment and of the biological value of plants intended for human and animal consumption. Composting of organic materials has a significant effect on changes in mobile forms of heavy metals. Therefore, the aim of this study was to determine the effect of the addition of biochar and sewage sludge on (i) the contents of water soluble forms of Cu, Cd, Pb, and Zn in composts; and (ii) the contents of mobile forms of these elements in sandy soil after the addition of composts...
January 11, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29331810/behavior-of-cylindrospermopsis-raciborskii-during-coagulation-and-sludge-storage-higher-potential-risk-of-toxin-release-than-microcystis-aeruginosa
#5
Hongmin Li, Haiyan Pei, Hangzhou Xu, Yan Jin, Jiongming Sun
Owing to the global warming and its strong adaptability, Cylindrospermopsis raciborskii has spread world-wide. However, as one of toxic cyanobacteria in many drinking water sources, it has not been drawn proper consideration in drinking water treatment plants so far. The investigation aimed at unveiling the fate of C. raciborskii during polyaluminum ferric chloride (PAFC) coagulation and sludge storage, revealing its differences from Microcystis aeruginosa. Results showed that C. raciborskii cells were effectively removed intactly under optimum coagulation conditions, but PAFC at higher dosages (>10 mg/L) triggered additional cylindrospermopsins release...
January 5, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29331718/partition-of-zn-cd-and-pb-during-co-combustion-of-sedum-plumbizincicola-and-sewage-sludge
#6
Feihong Guo, Zhaoping Zhong, Hui Xue
Co-combustion of sedum plumbizincicola and sewage sludge was performed in a tubular furnace. The influence of experimental conditions on the partitioning of Zn, Cd, and Pb was investigated. The results showed that 30% sewage sludge was proposed as the optimal ratio for the co-combustion as a compromise between low calorific value and high amount of heavy metal remained in the bottom ash. High temperature increased the volatilization degree of heavy metals, among which the performance of Cd and Pb was obvious than Zn...
January 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29330898/determination-of-phthalate-esters-in-soil-using-a-quick-easy-cheap-effective-rugged-and-safe-method-followed-by-gc-ms
#7
Qianjun Liu, Di Chen, Jiyuan Wu, Guangcai Yin, Qintie Lin, Min Zhang, Huawen Hu
A quick, easy, cheap, effective, rugged, and safe procedure was designed to extract pesticide residues from fruits and vegetables with a high percentage of water. It has not been used extensively for the extraction of phthalate esters from sediments, soils and sludges. In this work, this procedure was combined with gas chromatography with mass spectrometry to determine 16 selected phthalate esters in soil. The extraction efficiency of the samples was improved by ultrasonic extraction and dissolution of the soil samples in ultra-pure water, which promoted the dispersion of the samples...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29330819/preparation-of-a-synthetic-seed-for-the-common-reed-harboring-an-endophytic-bacterium-promoting-seedling-growth-under-cadmium-stress
#8
Ting Gao, Xianyang Shi
Bacterial seed endophytes can facilitate germination and early plant development. Therefore, the introduction of seed-borne endophytes may improve selected plant characteristics across generations. In this study, regenerated plantlets of common reed (Phragmites australis) were inoculated with activated sludge to obtain a specific functional endophytic bacterium. Denaturing gradient gel electrophoresis demonstrated that abundant endophytic bacteria could be enriched in the roots. A siderophore-producing endophytic bacterium was isolated from the roots and identified as Herbaspirillum frisingense RE3-3 based on 16S rRNA sequences...
January 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29330191/thermophilic-alkaline-fermentation-followed-by-mesophilic-anaerobic-digestion-for-efficient-hydrogen-and-methane-production-from-waste-activated-sludge-focusing-on-dynamics-of-bacterial-pathogens-as-revealed-by-the-combination-of-metagenomic-and-qpcr-analysis
#9
Jingjing Wan, Yuhang Jing, Yue Rao, Shicheng Zhang, Gang Luo
Thermophilic alkaline fermentation followed by mesophilic anaerobic digestion (TM) for hydrogen and methane production from waste activated sludge (WAS) was investigated. TM process was also compared to mesophilic alkaline fermentation followed by mesophilic anaerobic digestion (MM) process and one-stage mesophilic anaerobic digestion (M) process. The results showed that both hydrogen yield (74.5 mLH2/gVS) and methane yield (150.7 mLCH4/gVS) in TM process were higher than those (6.7 mLH2/gVS and 127.8 mLCH4/gVS) in MM process...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29328986/post-anaerobic-digestion-thermal-hydrolysis-of-sewage-sludge-and-food-waste-effect-on-methane-yields-dewaterability-and-solids-reduction
#10
Kine Svensson, Oda Kjørlaug, Matthew J Higgins, Roar Linjordet, Svein J Horn
Post-anaerobic digestion (PAD) treatment technologies have been suggested for anaerobic digestion (AD) to improve process efficiency and assure hygenization of organic waste. Because AD reduces the amount of organic waste, PAD can be applied to a much smaller volume of waste compared to pre-digestion treatment, thereby improving efficiency. In this study, dewatered digestate cakes from two different AD plants were thermally hydrolyzed and dewatered, and the liquid fraction was recirculated to a semi-continuous AD reactor...
January 4, 2018: Water Research
https://www.readbyqxmd.com/read/29328935/evaluation-of-robustness-of-activated-sludge-using-calcium-induced-enhancement-of-respiration
#11
Zhi-Hua Li, Yuan-Mo Zhu, Jing Zhang, Cheng-Jian Yang, Tian-Yu Zhang, Han-Qing Yu
Robustness of an activated sludge system, describing uncertainty and operational risk, was evaluated using the absence or presence of calcium-induced enhancement of respiration (CaER) effect. Generally, the fast-growing system was susceptible to external environmental variations, of which the sludge exhibited significant CaER effect under normal operational conditions, while the slow growing system showed less significant CaER effect. However, sludge in both systems exhibited CaER effect under stressed conditions of decreasing temperature or ammonia shocking...
January 4, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29328933/economic-assessment-of-biodiesel-production-from-wastewater-sludge
#12
Jiaxin Chen, Rajeshwar Dayal Tyagi, Ji Li, Xiaolei Zhang, Patrick Drogui, Feiyun Sun
Currently, there are mainly two pathways of the biodiesel production from wastewater sludge including 1) directly extracting the lipid in sludge and then converting the lipid to biodiesel through trans-esterification, and 2) employing sludge as medium to cultivate oleaginous microorganism to accumulate lipid and then transferring the lipid to biodiesel. So far, the study was still in research stage and its cost feasibility was not yet investigated. In this study, biodiesel production from wastewater sludge was designed and the cost was estimated with SuperPro Designer...
January 4, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29328931/biostimulation-and-bioaugmentation-of-native-microbial-community-accelerated-bioremediation-of-oil-refinery-sludge
#13
Ajoy Roy, Avishek Dutta, Siddhartha Pal, Abhishek Gupta, Jayeeta Sarkar, Ananya Chatterjee, Anumeha Saha, Poulomi Sarkar, Pinaki Sar, Sufia K Kazy
Scope for developing an engineered bioremediation strategy for the treatment of hydrocarbon-rich petroleum refinery waste was investigated through biostimulation and bioaugmentation approaches. Enhanced (46-55%) total petroleum hydrocarbon (TPH) attenuation was achieved through phosphate, nitrate or nitrate+phosphate amendment in the sludge with increased (upto 12%) abundance of fermentative, hydrocarbon degrading, sulfate-reducing, CO2-assimilating and methanogenic microorganisms (Bacillus, Coprothermobacter, Rhodobacter, Pseudomonas, Achromobacter, Desulfitobacter, Desulfosporosinus, T78, Methanobacterium, Methanosaeta, etc)...
January 3, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29327471/exploring-microbial-n2-o-reduction-a-continuous-enrichment-in-nitrogen-free-medium
#14
Monica Conthe, J Gijs Kuenen, Robbert Kleerebezem, Mark C M van Loosdrecht
N2 O is a potent greenhouse gas, but also a potent electron acceptor. In search of thermodynamically favorable - yet undescribed - metabolic pathways involving N2 O reduction, we set up a continuous microbial enrichment, inoculated with activated sludge, fed with N2 O as the sole electron acceptor and acetate as an electron donor. A nitrogen-free mineral medium was used with the intention of creating a selective pressure towards organisms that would use N2 O directly as source of nitrogen for cell synthesis...
January 12, 2018: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/29327185/degradation-of-organics-extracted-from-dewatered-sludge-by-alkaline-pretreatment-in-microbial-electrolysis-cell
#15
Kai Hu, Lan Xu, Wei Chen, Shuo-Qiu Jia, Wei Wang, Feng Han
Waste activated sludge in China are mostly subjected to dewatering process before final disposal without stabilization. This study investigated the feasibility of organics degradation and H2 production from non-stabilized dewatered sludge (DS) by microbial electrolysis cells (MECs). Alkaline pretreatment was used to disintegrate sludge matrix and solubilize organic matters in DS. Then, the treatment performance of DS supernatant in a single-chamber MEC at various applied voltages was investigated. The COD (chemical oxygen demand) removal rate increased with increasing voltage, which ranged from 26...
January 11, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29326005/an-anaerobic-aerobic-sequential-batch-process-with-simultaneous-methanogenesis-and-short-cut-denitrification-for-the-treatment-of-marine-biofoulings
#16
S Akizuki, T Toda
Although combination of denitritation and methanogenesis for wastewater treatment has been widely investigated, an application of this technology to solid waste treatment has been rarely studied. This study investigated an anaerobic-aerobic batch system with simultaneous denitritation-methanogenesis as an effective treatment for marine biofoulings, which is a major source of intermittently discharged organic solid wastes. Preliminary NO2--exposed sludge was inoculated to achieve stable methanogenesis process without NO2- inhibition...
January 8, 2018: Waste Management
https://www.readbyqxmd.com/read/29324322/kinetic-study-of-heavy-metals-cu-and-zn-removal-during-sewage-sludge-ash-calcination-in-air-and-n2-atmospheres
#17
Rundong Li, Zhenyu Zhai, Yanlong Li, Tianhua Yang, Yang Chen
Heavy metal control is essential during the thermochemical recovery of phosphorus (P) from sewage sludge ash (SSA). For medium volatile heavy metals, i.e. Cu and Zn, the effect of chlorine additive was complicated and more sensitive to temperature variation. So, in the in-depth study on the removal kinetics of Cu and Zn was necessary. Thus, the studies described in this paper considered the experiments and kinetic models of Cu and Zn removal in SSA through calcination under different atmospheres and temperatures...
December 23, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29322393/contribution-of-ammonia-oxidizing-archaea-and-ammonia-oxidizing-bacteria-to-ammonia-oxidation-in-two-nitrifying-reactors
#18
Papitchaya Srithep, Preeyaporn Pornkulwat, Tawan Limpiyakorn
In this study, two laboratory nitrifying reactors (NRI and NRII), which were seeded by sludge from different sources and operated under different operating conditions, were found to possess distinct dominant ammonia-oxidizing microorganisms. Ammonia-oxidizing archaeal (AOA) amoA genes outnumbered ammonia-oxidizing bacterial (AOB) amoA genes in reactor NRI, while only AOB amoA genes were detectable in reactor NRII. The AOA amoA gene sequences retrieved from NRI were characterized within the Nitrososphaera sister cluster of the group 1...
January 10, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29322389/performance-of-ceramic-ultrafiltration-and-reverse-osmosis-membranes-in-treating-car-wash-wastewater-for-reuse
#19
Shamima Moazzem, Jamie Wills, Linhua Fan, Felicity Roddick, Veeriah Jegatheesan
Reusing treated effluents in industries is a great option to conserve freshwater resources. For example, car wash centres all over Australia are estimated to use 17.5 billion litres of water and discharge it as wastewater and spend $75 million a year for both purchasing fresh water and for treating and/or discharging the wastewater. Therefore, it is important to develop simple but reliable systems that can help to treat and reuse car wash wastewater. Significant savings could also be associated with the implementation of such systems...
January 10, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29322388/decision-support-system-for-management-of-reactive-nitrogen-flows-in-wastewater-system
#20
Francisco R A Nascimento, Asher Kiperstok, Juan Martín, Jordi Morató, Eduardo Cohim
The change in nitrogen balance causes many environmental and socioeconomic impacts. In relation to food production and nitrogen release in wastewater systems, wastewater and sludge discharge and mineral fertilizer use intensify nitrogen imbalance of a region. The replacement of mineral fertilizer by nitrogen from treated wastewater, biosolids, and treated urine is a promising alternative. This work presents a model to support decision taking for the management of reactive nitrogen flows in wastewater systems based on system dynamics...
January 10, 2018: Environmental Science and Pollution Research International
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