Hydrogen substrate biological Pd reactor performing aeration with no-pore hollow fiber membrane

Abstract

The invention relates to a hydrogen substrate biological Pd reactor performing aeration with a no-pore hollow fiber membrane. The hydrogen substrate biological Pd reactor comprises a main reactor anda side reactor, wherein the main reactor comprises a main reactor pipe body, a first no-pore hollow fiber membrane assembly which is arranged in the main reactor pipe body along the main reactor pipebody and to which biological Pd is adhered, and first hydrogen gas inlets which are formed in the upper end and the lower end of the first no-pore hollow fiber membrane assembly; the side reactor comprises a side reactor pipe body, a second no-pore hollow fiber membrane assembly which is arranged in the side reactor pipe body along the side reactor pipe body and to which the biological Pd is adhered, and a second hydrogen gas inlet which is formed in the upper end of the second no-pore hollow fiber membrane assembly; and the main reactor and the side reactor form circular connection and are communicated with an external hydrogen gas source and a water supply system. Compared with the prior art, the hydrogen substrate biological Pd reactor disclosed by the invention is reasonable in structure, can be used for recovering and fixing Pd elements in water, and can control the hydrogen gas supply quantity; and the treatment effect is good, the utilization rate of the hydrogen gas is increased, and the situations that the diffusion of the gas is not uniform and the utilization rate of the gas is low caused by on-way resistance are avoided.

Description

technical field [0001] The invention relates to a bioreactor, in particular to a hydrogen-matrix bio-palladium reactor aerated with a non-porous hollow fiber membrane. Background technique [0002] Oxidative pollution in groundwater in many areas of our country is very serious. These oxidative pollutants mainly include nitrate, sulfate, bromate, perchlorate, chromate and other ionic compounds, organic chlorides such as chloroform, chlorophenol, three Vinyl chloride, etc. [0003] For the chemical catalytic reduction of oxidative pollutants, metal palladium (Pd) is a commonly used high-efficiency catalyst. However, due to the high price of palladium, how to reduce the cost of palladium-based catalyst technology has become one of the focuses of current research. For this reason, in recent years, research has been conducted to prepare nano-palladium (biological palladium) from wastewater containing palladium ions by means of microbial reduction, and then use its excellent cata...

AI Technical Summary

Problems solved by technology

After long-term operation practice, the hydrogen matrix biofilm reactor in the above patent has a good treatment effect and stable operation, but there are the following 8 problems: 1) The diameter of the PVDF hollow fiber ultrafiltration membrane in the above patent is relatively large (1.0- 3.0mm), the membrane length and the number of membrane filaments are limited by the size of the reactor, the number of membrane filaments is limited, and the membrane surface area per unit volume of the reactor is small 2) The reactor volume is large, and the mixed flow effect is poor, which is not conducive to biofilm shedding and regeneration

3) Porous membranes are easily blocked by precipitation such as calcium carbonate, and cannot reduce Pd at the same time 2+ Preparation of nano-palladium, accumulation of calcium carbonate and other precipitates on the membrane surface affects hydrogen transmission

4) When the membrane filament sample is collected, the membrane module is exposed to the air, which will destroy the biofilm and affect the operation effect of the reactor

5) The reactor lacks airtightness, and air is easy to enter the interior

6) Porous PVDF hollow fiber membranes are not pressure-resistant, easy to leak, hydrogen gas permeability coefficient is large, hydrogen gas is easy to overflow, and the hydrogen gas permeation number of the same membrane material is inconsistent, it is difficult to determine the hydrogen gas flux through the gas supply pressure

7) The effect of microbial reduction of some refractory oxidative pollutants is not stable, and it is easily affected by environmental factors. It takes a long time to acclimatize specific pollutants and is not resistant to impact loads; empty, h 2 The overflow from the solution accumulates in the headspace inside the reactor, which may contain a relatively high concentration of hydrogen in the headspace, posing a safety hazard

Images