scholarly journals Autohydrogenotrophic Denitrification Using the Membrane Biofilm Reactor for Removing Nitrate from High Sulfate Concentration of Water

Archaea ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Yanhao Zhang ◽  
Haohan Zhang ◽  
Zhibin Zhang ◽  
Yuchen Wang ◽  
Taha Marhaba ◽  
...  
Keyword(s):  
Electron Donor ◽  
Distribution Ratio ◽  
Biofilm Reactor ◽  
Denitrification Rate ◽  
Sulfate Concentration ◽  
Molecular Microbiology ◽  
Membrane Biofilm Reactor ◽  
Loading Ratio ◽  
High Sulfate

This study investigated the performance of an autohydrogenotrophic membrane biofilm reactor (MBfR) to remove nitrate from water with high sulfate concentrations. The results of simulated running showed that TN removal could be over than 98.8% with the maximum denitrification rate of 134.6 g N/m3 d under the conditions of the influent sulfate concentrations of 300 mg SO42−/l. The distribution ratio of H2 electron donor for nitrate and sulfate was 70.0 : 26.9 at the high influent loading ratio of sulfate/nitrate of 853.3 g SO42−/m3 d : 140.5 g N/m3 d, which indicated that denitrification bacteria (DB) were normally dominated to complete H2 electron with sulfate bacteria (SRB). The results of molecular microbiology analysis showed that the dominated DB were Rhodocyclus and Hydrogenophaga, and the dominated SRB was Desulfohalobium, under the high influent sulfate concentrations.

Simultaneous bio-reduction of trichloroethene, trichloroethane, and chloroform using a hydrogen-based membrane biofilm reactor

2008 ◽  
Vol 58 (3) ◽  
pp. 495-501 ◽  
Author(s):  
Jinwook Chung ◽  
Bruce E. Rittmann
Keyword(s):  
Electron Donor ◽  
Water Solubility ◽  
Chlorinated Solvents ◽  
Technological Advance ◽  
Biofilm Reactor ◽  
Treatment Technology ◽  
Chlorinated Compounds ◽  
Membrane Biofilm Reactor ◽  
One Step ◽  
Inhibitory Interactions

The contamination of water by chlorinated solvents is recognized as a serious and widespread problem throughout the industrialized world. Here, we focus on three chlorinated solvents that are among those most commonly detected and that have distinct chemical features: trichloroethene (TCE), trichloroethane (TCA), and chloroform (CF). Because many contaminated waters contain mixtures of the chlorinated solvents, a treatment technology that detoxifies all of them simultaneously is highly desirable. The membrane biofilm reactor (MBfR) is a recent technological advance that makes it possible to deliver H2 gas to bacteria efficiently and safely, despite hydrogen's low water solubility and risk of forming a combustible atmosphere when mixed with air. The objectives of this work are to document whether or not the three chlorinated compounds can be dechlorinated simultaneously in a H2-based MBfR and to determine if competitive or inhibitory interactions affect bio-reduction of any of the solvents. The main finding is a demonstration that directly using H2 as the electron donor makes it possible to bio-reduce combinations of different chlorinated solvents. This finding supports that the H2-based MBfR can treat multiple chlorinated solvents in one step, addressing a common groundwater situation. We saw possible evidence of inhibition by CF at a concentration greater than about 1 μM, competition for H2 from sulfate and nitrate reductions, and possible inhibition of TCE reduction from the accumulation of chloroethane (CA) or chloromethane (CM).

Selenate and Nitrate Bioreductions Using Methane as the Electron Donor in a Membrane Biofilm Reactor

2016 ◽  
Vol 50 (18) ◽  
pp. 10179-10186 ◽  
Author(s):  
Chun-Yu Lai ◽  
Li-Lian Wen ◽  
Ling-Dong Shi ◽  
Kan-Kan Zhao ◽  
Yi-Qi Wang ◽  
...  
Keyword(s):  
Electron Donor ◽  
Biofilm Reactor ◽  
Membrane Biofilm Reactor

Hydrogen-based, hollow-fiber membrane biofilm reactor for reduction of perchlorate and other oxidized contaminants

2004 ◽  
Vol 49 (11-12) ◽  
pp. 223-230 ◽  
Author(s):  
R. Nerenberg ◽  
B.E. Rittmann
Keyword(s):  
Drinking Water ◽  
Electron Donor ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Chlorinated Solvents ◽  
Drinking Water Treatment ◽  
Primary Electron ◽  
Biofilm Reactor ◽  
Fiber Membrane ◽  
Membrane Biofilm Reactor

Many oxidized pollutants, such as nitrate, perchlorate, bromate, and chlorinated solvents, can be microbially reduced to less toxic or less soluble forms. For drinking water treatment, an electron donor must be added. Hydrogen is an ideal electron donor, as it is non-toxic, inexpensive, and sparsely soluble. We tested a hydrogen-based, hollow-fiber membrane biofilm reactor (MBfR) for reduction of perchlorate, bromate, chlorate, chlorite, chromate, selenate, selenite, and dichloromethane. The influent included 5 mg/L nitrate or 8 mg/L oxygen as a primary electron accepting substrate, plus 1 mg/L of the contaminant. The mixed-culture reactor was operated at a pH of 7 and with a 25 minute hydraulic detention time. High recirculation rates provided completely mixed conditions. The objective was to screen for the reduction of each contaminant. The tests were short-term, without allowing time for the reactor to adapt to the contaminants. Nitrate and oxygen were reduced by over 99 percent for all tests. Removals for the contaminants ranged from a minimum of 29% for chlorate to over 95% for bromate. Results show that the tested contaminants can be removed as secondary substrates in an MBfR, and that the MBfR may be suitable for treating these and other oxidized contaminants in drinking water.

Bioreduction of nitrate in high-sulfate water using a hydrogen-based membrane biofilm reactor equipped with a separate carbon dioxide module

2020 ◽  
Vol 385 ◽  
pp. 123831 ◽  
Author(s):  
Siqing Xia ◽  
Chengyang Wu ◽  
Xiaoxiao Yang ◽  
Yun Zhou ◽  
Luman Zhou ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Biofilm Reactor ◽  
Membrane Biofilm Reactor ◽  
High Sulfate

A membrane biofilm reactor achieves aerobic methane oxidation coupled to denitrification (AME-D) with high efficiency

2008 ◽  
Vol 58 (1) ◽  
pp. 83-87 ◽  
Author(s):  
O. Modin ◽  
K. Fukushi ◽  
F. Nakajima ◽  
K. Yamamoto
Keyword(s):  
Methane Oxidation ◽  
High Efficiency ◽  
Biofilm Reactor ◽  
Practical Application ◽  
Suspended Culture ◽  
Consumption Ratio ◽  
Membrane Biofilm Reactor ◽  
Nitrate Consumption ◽  
Attached Culture ◽  
Aerobic Methanotrophs

Methane would potentially be an inexpensive, widely available electron donor for denitrification of wastewaters poor in organics. Currently, no methanotrophic microbe is known to denitrify. However, aerobic methane oxidation coupled to denitrification (AME-D) has been observed in several laboratory studies. In the AME-D process, aerobic methanotrophs oxidise methane and release organic metabolites and lysis products, which are used by coexisting denitrifiers as electron donors for denitrification. Due to the presence of oxygen, the denitrification efficiency in terms of methane-to-nitrate consumption is usually low. To improve this efficiency the use of a membrane biofilm reactor was investigated. The denitrification efficiency of an AME-D culture in (1) a suspended growth reactor, and (2) a membrane biofilm reactor was studied. The methane-to-nitrate consumption ratio for the suspended culture was 8.7. For the membrane-attached culture the ratio was 2.2. The results clearly indicated that the membrane-attached biofilm was superior to the suspended culture in terms of denitrification efficiency. This study showed that for practical application of the AME-D process, focus should be placed on development of a biofilm reactor.

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