1,720,983 research outputs found
UASB Performance and Perspectives in Urban Wastewater Treatment at Sub-Mesophilic Operating Temperature
No full textCombined microalgal photobioreactor/microbial fuel cell system: Performance analysis under different process conditions
No full textSimulation tests of in situ groundwater denitrification with aquifer-buried biocathodes
Full text linkProduction technologies, current role, and future prospects of biofuels feedstocks: A state-of-the-art review
No full textBioelectrochemical treatment of municipal solid waste landfill mature leachate and dairy wastewater as co-substrates
No full textControlled sequential biocathodic denitrification for contaminated groundwater bioremediation
No full textNitrate groundwater contamination is a worldwide concern. In this study, a novel 2-stage, sequential biocathodic denitrification system was tested to perform autotrophic denitrification of synthetic groundwater. The system was operated at different nitrate loading rates (66–301 gNO3 −-N m−3 NCC d−1) at constant NO3 −-N concentration (40 mgNO3 −-N L−1), by varying hydraulic retention time (HRT) during different trials from about 14 to 3 h. The system was able to achieve almost complete removal of nitrate (>95%) and Total Nitrogen (TN) (>92%) at NO3 − loading rates between 66 and 200 gNO3 −-N m−3 NCC d−1. The first stage reactor achieved lower values of effluent nitrate and nitrite than WHO guidelines for drinking water quality (<11.3 mg NO3 −-N L−1, and 0.9 mgNO2 −-N L−1, respectively) up to a nitrate loading rate of 167 gNO3 −-N m−3 NCC d−1; in these conditions the second stage acted mainly as polishing step. From a loading rate of 200 gNO3 −-N m−3 NCC d−1 on, N2O accumulation was observed in the first stage reactor, afterwards successfully removed in the second stage. Maximum nitrate removal rate of the 2-step process was 259.83 gNO3 −-N m−3 NCC at HRT of 3.19 h. The specific energy consumption of the system (SEC) decreased with decreasing HRT, both in terms of mass of nitrate removed (SECN) and volume treated (SECV). The described combination of two bioelectrochemical systems system hence proved to be effective for groundwater denitrificatio
Membrane bioreactors for sustainable, fit-for-purpose greywater treatment: a critical review
No full textAn Integrated Mathematical Model of Microbial Fuel Cell Processes: Bioelectrochemical and Microbiologic Aspects
No full textMicrobial Fuel Cells (MFCs) represent a still relatively new technology for liquid organic waste treatment and simultaneous recovery of energy and resources. Although the technology is quite appealing due its potential benefits, its practical application is still hampered by several drawbacks, such as systems instability (especially when attempting to scale-up reactors from laboratory prototypes), internally competing microbial reactions, and limited power generation. This paper is an attempt to address some of the issues related to MFC application in wastewater treatment with a simulation model. Reactor configuration, operational schemes, electrochemical and microbiological characterization, optimization methods and modelling strategies were reviewed and have been included in a mathematical simulation model written with a multidisciplinary, multi-perspective approach, considering the possibility of feeding real substrates to an MFC system while dealing with a complex microbiological population. The conclusions drawn herein can be of practical interest for all MFC researchers dealing with domestic or industrial wastewater treatment
Bioelectrochemical Systems for Removal of Selected Metals and Perchlorate from Groundwater: A Review
Full text linkGroundwater contamination is a major issue for human health, due to its largely diffused exploitation for water supply. Several pollutants have been detected in groundwater; amongst them arsenic, cadmium, chromium, vanadium, and perchlorate. Various technologies have been applied for groundwater remediation, involving physical, chemical, and biological processes. Bioelectrochemical systems (BES) have emerged over the last 15 years as an alternative to conventional treatments for a wide variety of wastewater, and have been proposed as a feasible option for groundwater remediation due to the nature of the technology: the presence of two different redox environments, the use of electrodes as virtually inexhaustible electron acceptor/donor (anode and cathode, respectively), and the possibility of microbial catalysis enhance their possibility to achieve complete remediation of contaminants, even in combination. Arsenic and organic matter can be oxidized at the bioanode, while vanadium, perchlorate, chromium, and cadmium can be reduced at the cathode, which can be biotic or abiotic. Additionally, BES has been shown to produce bioenergy while performing organic contaminants removal, lowering the overall energy balance. This review examines the application of BES for groundwater remediation of arsenic, cadmium, chromium, vanadium, and perchlorate, focusing also on the perspectives of the technology in the groundwater treatment field
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