Method for advanced bioelectrochemical treatment of pollutants
The aspects of embodiments of the invention relate to advanced bioelectrochemical systems. More specifically, the invention relates to the utilization of a power source such as, but not limited to, photo-active, semiconducting materials, batteries, or the like integrated with bioelectrochemical systems perhaps to increase oxidation and/or reduction reactions, which can be applied to the treatment of pollutants environmental media such as but not limited to water, wastewater, soil, and other water-containing environment.
1. A method for enhancing biodegradation of contaminants comprising the steps of:
providing a bioelectrochemical contaminant biodegradation system comprising:
an anode within an environmental media having a contaminant;
a microbial population near said anode in said environmental media;
a cathode;
system generated electrons and protons near said anode from oxidation reactions and metabolism reactions of said microbial population with said contaminant; and
a circuit providing a flow of system generated electrons collected from said environmental media near said anode to said cathode;
connecting a photocatalytic device between said anode and said cathode, wherein said photocatalytic device comprises a semi-conducting material;
creating photochemical-reactions in said semi-conducting material by exposing said semi-conducting material to a light source which creates electron-hole pairs by releasing photoelectrons from said semi-conducting material;
directing said photoelectrons released from said semi-conducting material to said cathode;
utilizing said photoelectrons at said cathode by combining said photoelectrons with said protons and oxygen to form water;
filling said electron-hole pairs in said semi-conducting material of said photocatalytic device with said system generated electrons from said anode;
speeding up an electron transfer between said anode to said cathode with said second flow of system generated electrons;
increasing biodegradation of at least some of said contaminant with said sped up electron transfer;
increasing oxidation near said anode; and
generating more of said system generated electrons and protons near said anode to continue said electron transfer between said anode and said cathode.
2. The method of claim 1 wherein said contaminant is chosen from petroleum hydrocarbons, volatile organic compounds, semi-volatile organic compounds, ethers, fuel oxygenates, ketones, alcohols, amines, amides, monoaromatic compounds, chlorinated solvents, halogenated hydrocarbons, endocrine disrupting compounds, dioxanes, dioxins, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, chlorobenzenes, phenols, chlorophenols, perfluorinated compounds, chemical oxygen demand, heavy metals, arsenic, selenium, nitrate, perchlorate, carbon dioxide, sulfur oxides, nitrogen oxides, and any combination thereof.
3. The method of claim 1 wherein said environmental media is chosen from water, soil, sediment, groundwater, wastewater, surface water, gravel, coal, peat, fractured rock, air, flue gas, and any combination thereof.
4. The method of claim 1 wherein said semi-conducting material is chosen from silicon solar cells, perovskite, rutile, anatase, sphalerite, goethite, metal oxides, mixed metal oxides, metal sulfides, metalloids, and any combination thereof.
5. The method of claim 1 and further comprising a step of providing a power source connected to said anode.
6. The method of claim 5 wherein said step of providing a power source comprises the step of continuously providing power to said anode.
7. The method of claim 6 wherein said step of continuously providing power to said comprises a power source chosen from a solar power source coupled with a battery, a solar power source coupled with a transformer, a solar power source coupled with a rectifier, a solar power source coupled with a direct current power supplier, a wind power source coupled with a battery, a wind power source coupled with a transformer, a wind power source coupled with a rectifier, a wind power source coupled with a direct current power supplier, and any combination thereof.
8. The method of claim 1 wherein said environmental media comprises wastewater.
9. The method of claim 1 and further comprising the step of maximizing electron transfer at said anode.
10. The method of claim 1 wherein said anode comprises a stainless-steel anode.
11. The method of claim 1 wherein said anode comprises an anode with bristles.
12. The method of claim 1 wherein said anode comprises a column shaped anode.
13. The method of claim 1 and further comprising the step of installing a plurality of anodes vertically in said environmental media.
14. The method of claim 13 wherein said step of installing a plurality of anodes vertically in said environmental media comprises the step of installing said plurality of anodes vertically in rows in said environmental media.
15. The method of claim 9 wherein said step of maximizing electron transfer at said anode comprises the step of providing a plurality of stainless-steel, column shaped anodes with bristles which are vertically installed in said environmental media.
16. The method of claim 8 and further comprising the step of utilizing an aeration treatment system for wastewater with said anode, said cathode and said power source connected to said anode.
17. The method of claim 5 and further comprising the step of connecting said power source to said anode for a time chosen from about one minute to about one month.