Electric-enhanced zero-valent-iron anaerobic water treatment device and method

Abstract

The invention discloses an electric-enhanced zero-valent-iron anaerobic water treatment device. The device comprises an up-flow anaerobic bioreactor, wherein an electric enhanced zero-valent-iron system is arranged in the middle of a barrel of the up-flow anaerobic bioreactor; the electric enhanced zero-valent-iron system comprises 2N electrodes formed by anodes and cathodes which are periodicallyarranged at intervals in the axial direction, wherein N is a positive integer; the anodes and the cathodes are connected with a direct-current power source outside the barrel through wires; and the space between every two adjacent electrodes are filled with a zero-valent-iron layer. According to the invention, on the basis of a zero-valent-iron coupling anaerobic reactor, a plurality of series orparallel electrodes are added, so that the over potential of a reaction is reduced, the electron obtaining rate of cathode microorganisms is accelerated, and the reduction reaction is promoted to berapidly carried out. An electric field is added, so that activity of the microorganisms can be stimulated, electron transfer between the electrodes and the microorganisms on the surface of the electrodes is facilitated, and the reaction rate of anaerobic zero-valent iron is enhanced to a greater extent.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to an electrically enhanced zero-valent iron anaerobic water treatment device and method. Background technique [0002] Anaerobic digestion is one of the most effective and practical methods for treating medium and high concentration organic wastewater. It combines sewage treatment with energy, and has been widely concerned and applied at home and abroad. The anaerobic digestion process mainly includes three stages: hydrolytic acidification, acetic acidification and methanation. Methanogens have slow metabolism and are sensitive to environmental conditions, which can easily cause an imbalance between acid production and methanation. The increase of influent organic load or the large fluctuation of water quality will easily lead to the enhancement of organic acid accumulation, the decrease of pH, the inhibition of methanation, and even the failure of anaerobic process. Theref...

AI Technical Summary

Problems solved by technology

The above reaction of zero-valent iron will lead to an increase in pH value, and the reaction efficiency will drop significantly after the corrosion layer is formed on the surface

When zero-valent iron is packed in a fixed-bed reactor as a filler, the packed bed may be hardened due to surface corrosion, and it is difficult to perform the purification function stably for a long time

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