Studies On Reactive Red X-3B Wastewater Treatment By Microwave Ultraviolet In Pilot Scale

This research is based on the achieved results of selecting light resource in model scale. The reactive red X-3B wastewater treatment was studied using the microwave ultraviolet reactor (MWUVR) in pilot scale. In this paper, some different sizes MWUV lamps with different parameters and several pilot scale reactors were made. We did some researches following the three aspects. 1. Optimize several parameters of the microwave ultraviolet lamp (MWUVL) The MWUVL were used in the MWUVR in pilot scale. That the power of the microwave, the number and the equipment way and the gas pressure of the MWUVL caused the infection were discussed. The following results were obtained. (1) The length of the MWUVL used in the MWUVR should be less than 600mm. (2) The higher of the microwave power, the stronger ultraviolet irradiation of the MWUVL. (3) The equipment way of the MWUVL affects the treatment efficiency. The MWUVL should be installed below the microwave producer. (4) The low-pressure MWUVL has the better treatment efficiency than the middle-pressure MWUVL. The former had 1.6 times color removal of the later, when they were used to treat the 0.1g/L reactive red X-3B wastewater for 3.5 hours. 2. Several factors that affect ozone production caused by MWUVL Through mensurating the ozone produced by a group of MWUVL (4 lamps) through air aeration and oxygen aeration separately. We had the some results. When the aeration intensity was 50L/h, ozone quantity produced by oxygen aeration is 4.6 times of that by air aeration. When the aeration intensity was 300L/h, ozone quantity produced by oxygen aeration is 5.4 times of that by air aeration. The results shows that the aeration intensity is stronger, the ozone quantity is larger and the ozone concentration is lower. 3. Studies on the infection of TiO2 and sevaral oxidants adding to the MWUVR. By treating 0.1g/L reactive red X-3B model wastewater (150L), the infections of the TiO2 and sevaral oxidants were discussed. The results show that the colour removals were 38.50% and 55.83% in 3.5h treatment time by MW/UV and TiO2(4g/L)+MW/UV method separately. In 1.5h reacting time H2O2(1mL/L) and H2O2(1mL/L) +MW/UV way had the 19.87% and 44.01% colour removal separately. After treating 0.5h the colour removal was 62.88% by O3 (7.5g/L)+ MW/UV, while MW/UV and single O3 way caused the 4.39% and 43.28% colour removal separately. The cooperation of the H2O2 and MW/UV can not be found. But the O3 and MW/UV were cooperated when they treated together.