Backflow type hydrogen matrix bio-membrane reactor with carbon dioxide serving as carbon source

Abstract

The invention relates to a backflow type hydrogen matrix bio-membrane reactor with carbon dioxide serving as a carbon source. The backflow type hydrogen matrix bio-membrane reactor comprises a reactor barrel body (24), wherein a water outlet (8) and a backflow port (23) are formed at the upper end of the reactor barrel body (24); a water inlet (27) and an emptying port (4) are formed at the lower end of the reactor barrel body (24); an 1# membrane module for feeding H2 and a 2# membrane module for feeding CO2 are arranged in the reactor barrel body (24); and membrane silks for forming the membrane modules are marketed PVDF (Polyvinylidene Fluoride) hollow fiber membranes which have outside diameter of 1.0 to 3.0mm, inside diameter of 0.5 to 1.5mm and membrane pore size of 0.01 to 0.4 microns. The backflow type hydraulic matrix bio-membrane reactor is reasonable in structure and good in treatment effect; CO2 can provide the carbon source for oligotrophic underground water and can stabilize the pH (Potential Of Hydrogen) of the environment; and the membrane aeration promotes the gas to dissolve in the water phase, thus the utilization rate of the gas can be improved, and the overflowing and waste of CO2 in the conventional aeration method can be avoided; the inner part of the reactor is kept in a complete mixing state by a backflow system, thus the benefit is provided for removing pollutants; the upper end and the lower end are used for ventilating, so that the shortcomings that the gas cannot be uniformly spread due to the on-way resistance and the utilization rate is low can be avoided; and the membrane can be cleaned without disassembling the membrane modules. The backflow type hydrogen matrix bio-membrane reactor with the carbon dioxide serving as the carbon source can be used for effectively treating oxidation pollutants in the underground water.

Description

technical field [0001] The invention relates to a reflux hydrogen matrix biofilm reactor using carbon dioxide as a carbon source, specifically a reflux hydrogen matrix biofilm reactor that uses carbon dioxide as an inorganic carbon source and utilizes hydrogen autotrophic bacteria biofilm to purify polluted water The utility model relates to a device, which belongs to the technical field of treating oxidative pollutants in groundwater of environmental engineering and municipal engineering. Background technique [0002] In many areas of our country, groundwater is seriously polluted by oxidative pollutants. These oxidative substances mainly include ionic compounds such as nitrate, sulfate, bromate, etc., heavy metals in oxidized state, and volatile organic substances such as chloroform and p-nitrogen. Chlorobenzene, etc. [0003] Hydrogen-matrix biofilm technology is an autotrophic biological reduction method, which has the advantages of cleanness, no residue, high utilizati...

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Problems solved by technology

[0005] 1) Hydrogen autotrophic reducing bacteria will produce a certain amount of OH when reducing oxidative pollutants - , so that the pH value of the solution continues to rise, which not only affects the quality of the effluent water, but even exceeds the suitable growth range of hydrogen autotrophic reducing bacteria, and inhibits microbial activities

The above-mentioned patent adopts the method of adding a phosphate buffer with a concentration of about 0.004M in the influent to maintain a stable pH value of the reactor, but the phosphate cannot be degraded during the reaction process, and secondary pollution is introduced. At the same time, the high concentration of phosphate buffer salt Easy to combine with hardness ions in groundwater to form precipitates;

[0006] 2) There is a lack of inorganic carbon sources necessary for the growth of hydrogen autotrophic reducing bacteria in the groundwater. The above patents use the addition of NaHCO 3 As an inorganic carbon source, when dealing with groundwater with high hardness, if the pH value of the reactor is too high, it is easy to form CaCO 3 Precipitation adheres to the surface of the membrane filament, causing calcification of the hollow fiber membrane, which is unfavorable to the mass transfer of hydrogen and pollutants, and affects the quality of the effluent water;

[0007] 3) The complete mixing state of the liquid in the reactor in the above patent is realized by the magnetic stirrer at the bottom of the device. Although the energy consumption is saved to a certain extent, the mixing effect is not good, and it is not conducive to the further expansion of the reactor design, which limits its Promotion in practical engineering applications;

[0008] 4) The above patents are limited by the magnetic stirrer at the bottom. The top of the hollow fiber membrane module is filled with hydrogen and the bottom is sealed. During the transmission process, the hydrogen is affected by the resistance along the process and diffuses unevenly. The end is thin and the hydrogen utilization efficiency is low;

[0009] 5) The above-mentioned patent has no backwash design, and the reactor needs to be completely disassembled before the membrane module can be taken out when washing the membrane, which is inconvenient to operate and easy to damage the membrane module

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