Study Of TiO₂Photo-catalytic Technology In Ammonia Pollution Control

Livestock breeding release a large amount of ammonia in recent years, and sustainable development of aquaculture was seriously hindered. This study was to explore nano titanium dioxide(TiO2) photocatalytic technology for ammonia processing, and to provide theoretical basis for the technology used in livestock and poultry. The ammonia concentration in the conservation of piggery were measured by the AIR-DAC online multi-point detection system, then a structures of static photocatalytic reaction unit was built, to simulate ammonia concentration of the monitoring of piggery, discuss the effect of the degradation of ammonia of board and ceramic tile loaded with TiO2; Then activated carbon loaded with TiO2was made by dipping-lift the preparation of nanometer, the effect of activated carbon loaded with different concentration of TiO2was observed by scanning electron microscopy (SEM) method, on this basis the dynamic light catalytic reaction device was built, and the effects of ammonia degradation with photocatalytic reaction device of light intensity, air flow parameters are studied. The results showed that:(1)The highest concentration of ammonia in the conservation of piggery reached32.005±2ppm, min.5.732±1ppm. According to the change curve, the variable range of ammonia was changed to photocatalytic degradation of ammonia concentration because it is relative economic, ranged from10to30ppm. The final degradation efficiency of ammonia photocatalytic on board and ceramic tile loaded with TiO2is78±2%and37.3±2%respectively within120minutes. Therefore, board loaded with TiO2photocatalytic degradation of ammonia in closed environment is better than that of ceramic tile loaded with TiO2.(2)TiO2concentration has effect on activated carbon which loaded TiO2to a certain extent. When nano TiO2concentration is0.5%, the prepared nano TiO2/activated carbon (AC) surface of TiO2particles boundary is clearly visible, and the diffusion in the activated carbon surface is uniform, agglomeration is not obvious. Nano TiO2concentration of1.0%and in2.0%, TiO2/AC the diffusion in TiO2/AC surface, there are obvious agglomeration. So, the loading effect when the TiO2concentration is0.5%ismuch better than1.0%and2.0%.(3)UV reaction device is consisted of analog ammonia source generating system, photocatalytic reactor, AIR-DAC online detection system and gas supply system. The key part is the reactor, which includes activated carbon loaded with TiO2, UV light. When the light intensity is60μW/m2, the degradation efficiency of NH3is higher than the light intensity of30μW/m2. While the degradation efficiency of NH3in different air flow ranges as follows:2L/min(90%)>3L/min(88%)>4/Lmin(83%). When the light intensity is60μW/m2and the air flow is3L/min, the degradation efficiency of this device for different concentrations of ammonia ranges as follows:30ppm(95%)>50ppm(93%)>70ppm (92%).