Electrolysis-Driven Bioremediation to Enhance Nitrogen and Phosphorus Removal From Polluted River Sediment

Abstract In order to testify the effect of electrolysis and microbial remediation technology in polluted river sediment. Here, we explored the possibility of electrochemically removing ammoniacal nitrogen-nitrogen (NH3-N), nitrate-nitrogen (NO3−-N) and phosphate ions-phosphorous (PO43−-P) by using a titanium (Ti) mesh cathode, a Ti/Ti dioxide (TiO2)/Ruthenium (IV) oxide (RuO2) (RuO2-IrO2/Ti) mesh, and a magnesium-aluminum (Mg–Al) alloy anode placed within the sediment and overlying water. Results showed that approximately 151.82 ± 21.69 mg TN was removed which was five times more effective than the non-electrolytic controls (30.21 ± 13.73 mg), NH3-N concentration in the sediment was substantially reduced (up to 2.9 times) compared to the non-electrolytic controls. Its efficiency lies in the electrolysis process, which may directly remove NH3-N through electrochemical oxidation and simultaneously produce oxygen which helps nitrifying bacteria to convert NH3-N into NO3−-N by the role of anode; and electrolysis may directly remove NO3−-N in the overlying water through electrochemical reduction while simultaneously producing hydrogen electron donor for hydrogen autotrophic microorganism as Hydrogenophohaga, to be the dominant species in sediment to enhance the removal of NO3−-N by the role of cathode. Electrolysis also reduced the PO43−-P through electro-coagulation since Mg2+ ions could also produce since sacrificial Mg–Al alloy anode was used and electro-deposition on Ti mesh cathode both to increase PO43−-P removal in overlying water and sediment. This study verifies the benefits of electrolysis-driven bioremediation as a sustainable technology for the bioremediation of N and P polluted river sediments.

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A laboratory study to determine the use of polluted river sediment as a substrate for extensive green roofs

Water Science & Technology ◽

10.2166/wst.2018.501 ◽

2018 ◽

Vol 78 (11) ◽

pp. 2247-2255 ◽

Cited By ~ 1

Author(s):

Wei Zhang ◽

Xing Zhong ◽

Wu Che ◽

Huichao Sun ◽

Hailong Zhang

Keyword(s):

River Sediment ◽

Peat Soil ◽

River Sediments ◽

Green Roof ◽

Oxygen Demand ◽

Green Roofs ◽

Polluted River ◽

Artificial Rainfall ◽

Study Laboratory ◽

Extensive Green Roofs

Abstract In this study, laboratory-scale green (e.g. living) roof platforms were established to assess the potential use of polluted river sediment in their substrate mixture. The mean runoff retention of the green roof platforms, which contained peat and/or river sediment, after 11 artificial rainfall events was >72%, significantly higher than traditional roofs. However, green roof platforms that had been filled with peat soil showed chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) leaching. Green roofs that had used river sediment showed good leaching control for COD, TN and TP. The cumulative leaching masses from the green roofs contained 30% (COD), 42% (TN) and 47% (TP) as much as the total leaching mass from traditional roofs, and the Cu, Zn, Cd and Pb leaching risk from green roofs when river sediments are used as part of a substrate mixture was relatively low. Despite some nutrient leaching in the initial phase of runoff from the green roofs, river sediment has the potential to be used as a substrate for extensive green roofs.

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Management of nitrogen and phosphorus internal loading from polluted river sediment using Phoslock® and modified zeolite with intensive tubificid oligochaetes bioturbation

Chemical Engineering Journal ◽

10.1016/j.cej.2018.07.112 ◽

2018 ◽

Vol 353 ◽

pp. 46-55 ◽

Cited By ~ 23

Author(s):

Hongbin Yin ◽

Jincan Zhu ◽

Wanying Tang

Keyword(s):

River Sediment ◽

Internal Loading ◽

Nitrogen And Phosphorus ◽

Polluted River ◽

Modified Zeolite

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Effect of magnetic iron-zirconium modified zeolite on the different phosphorus forms in river sediment under aerobic and anoxic condition

Water Science & Technology ◽

10.2166/wst.2021.271 ◽

2021 ◽

Author(s):

Chunlei Wang ◽

Herong Gui ◽

Chen Li ◽

Jiayu Chen ◽

Chen Chen

Keyword(s):

River Sediment ◽

River Sediments ◽

Water Soluble ◽

Phosphorus Concentration ◽

Available Phosphorus ◽

Overlying Water ◽

Modified Zeolite ◽

Olsen P ◽

Phosphorus Forms ◽

Release Potential

Abstract In this study, a magnetic iron-zirconium modified zeolite (FeZrMZ) was synthesized. Through sediment culture experiments, the influence of the addition of modified materials on the migration and transformation of phosphorus in river sediments was investigated. The results show that the modified zeolite can not only effectively reduce the phosphorus concentration in the overlying water, but also significantly reduce the phosphorus concentration in the pore water of sediments. The addition of modified zeolite makes the unstable weakly adsorbed phosphorus (NH4Cl-P) and redox phosphorus (BD-P) transform into the more stable metal oxide bound phosphorus (NaOH-P) and very stable residual phosphorus (Res-P).The four types of bioavailable phosphorus (BAP), including water-soluble phosphorus (WSP), readily desorbable phosphorus (RDP), algae-available phosphorus (AAP), and NaHCO3 extractable phosphorus (Olsen-P). Under anoxic conditions, they were reduced by 53.5%, 14.1%, 23.8%, and 49.9% respectively. Under aerobic conditions, they were reduced by 23.2%, 16.6%, 32.1%, and 50.0%. Obviously, the addition of magnetic iron-zirconium modified zeolite can reduce the release potential of phosphorus in sediment, and it can be recovered through the action of an external magnetic field, so it can be used as an effective sediment modifier to control the sediment the release of phosphorus.

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Role of Eichhornia crassipes uptake in the removal of nitrogen and phosphorus from eutrophic waters

CHINESE JOURNAL OF ECO-AGRICULTURE ◽

10.3724/sp.j.1011.2010.00152 ◽

2010 ◽

Vol 18 (1) ◽

pp. 152-157 ◽

Cited By ~ 3

Author(s):

Zhi-Yong ZHANG ◽

Jian-Chu ZHENG ◽

Hai-Qin LIU ◽

Zhi-Zhou CHANG ◽

Liu-Gen CHEN ◽

...

Keyword(s):

Eichhornia Crassipes ◽

Nitrogen And Phosphorus

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Contemporary issues in watershed and water quality modeling for eutrophication control

Water Science & Technology ◽

10.2166/wst.1998.0183 ◽

1998 ◽

Vol 37 (3) ◽

pp. 93-102

Author(s):

Robert V. Thomann ◽

Lewis C. Linker

Keyword(s):

Coastal Waters ◽

Water Quality Modeling ◽

Significant Decline ◽

Suspension Feeding ◽

Watershed Model ◽

Nitrogen And Phosphorus ◽

Overlying Water ◽

Chesapeake Bay Watershed ◽

Eutrophication Control ◽

Quality Modeling

Three issues are discussed: controllability of nonpoint nutrient loadings using watershed models; the sometimes counter intuitive results from eutrophication models from nutrient controls for coastal waters; and the potential significant interaction of improvement in habitat for suspension feeding bivalves. For the Chesapeake Bay watershed model, and for Limit of Technology (LOT) controls, a 16% and 45% reduction in nitrogen and phosphorus, respectively, is calculated. For the Bay, it is concluded that removal of phosphorus only is less effective than nitrogen in improving bottom water DO because of differential transport of nitrogen downstream. For the Delaware estuary, a significant decline in phytoplankton chlorophyll has been observed in the absence of any nutrient controls but in the presence of improved DO. A simple model is offered that hypothesized an increase in benthic bivalve filtration of overlying water as a result of improvement in DO.

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The electrochemical behavior of an aluminum alloy anode for rechargeable Al-ion batteries using an AlCl3–urea liquid electrolyte

RSC Advances ◽

10.1039/c7ra05860h ◽

2017 ◽

Vol 7 (51) ◽

pp. 32288-32293 ◽

Cited By ~ 14

Author(s):

Chen Wang ◽

Junfeng Li ◽

Handong Jiao ◽

Jiguo Tu ◽

Shuqiang Jiao

Keyword(s):

Aluminum Alloy ◽

Electrochemical Behavior ◽

Low Cost ◽

Pyrolytic Graphite ◽

Liquid Electrolyte ◽

Al Alloy ◽

Alloy Anode ◽

Aluminum Alloy Anode

A novel Al-ion battery based on an Al alloy anode, pyrolytic graphite paper cathode, and low-cost AlCl3–urea liquid analogue electrolyte was successfully established. The present Al alloy/PG battery can afford a capacity as high as 105 mA h g−1.

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