【作者】 袁志容；

【导师】 王晓昌；

【作者基本信息】 西安建筑科技大学 ， 市政工程， 2004， 硕士

【摘要】 以西安市北石桥污水处理厂二级处理水为研究对象，通过臭氧—生物活性炭（O₃—BAC）工艺进行了以污水再生回用为目的的城市污水深度处理中试试验。试验考察了该工艺的处理效果，并分析研究了水中污染物的臭氧化特性以及生物活性炭滤床的处理特性。 臭氧-生物活性炭工艺能有效去除水中浊度、色度和嗅等感官性指标，色度去除率为92％，浊度去除率为82.8％，出水无不良味道。工艺对有机物具有良好的去除效果，UV₂₅₄去除率为57.9％，TOC去除率为25.8％。虽然臭氧生物活性炭工艺对氮的总量并没有降低，但是工艺对氮元素的存在形态有明显改变。水中有机氮、亚硝氮、氨氮基本上被氧化为硝氮存在于水中。工艺出水水质优于生活杂用水和景观用水水质标准。 臭氧化的功效并不在于改变有机物总量，其功效在于使有机物结构和性质发生改变，将大分子、不饱和性有机物氧化分解为饱和性、小分子有机物，提高有机物生化降解性，使原水的可生物降解溶解性有机碳BDOC从0.725mg／L提高到1.917mg／L。北石桥二级处理水中的有机物主要是一些芳香族、链烃类和脂肪族有机物，经过臭氧化后处理水中脂肪族、羧酸类、酯类有机物等生物易降解性有机物呈增加趋势。 生物活性炭床中生物量沿炭层深度呈递减关系，BAC滤柱中生物量主要集中在滤柱中上部，滤柱中有机物的去除与生物量的分布相似，也主要集中在滤池中上部。TOC在BAC柱中去除的绝对值为1.142mg／L，BDOC在BAC柱中去除的绝对值为1.206mg／L，二者基本相当，说明BAC柱中主要是通过微生物的新陈代谢作用对生物可降解性的有机物进行去除，而难降解性有机物还以TOC的形式存在，这与GC-MS的检测结果相一致。更多还原

【Abstract】 Aimed at reclamation of sewage, a pilot-scale experiment was conducted to treat the effluent from the secondary sedimentation tank of Xi’an Beishiqiao Wastewater Purification Center by Ozone and Biological Activated Carbon (O3-BAC) process. The experiment studied the removal efficiency of pollutants, the oxidation characteristic of ozone, and the characteristic of biological activated carbon filtering bed.The results showed that the O3-BAC process could remove organic matters, turbidity, color and odor efficiently. The average removal efficiencies of color, turbidity, UV254and TOC were 92%, 82.8%, 57.9% and 25.8% respectively, and although TN was not reduced, the form of nitrogen was changed obviously, with most of organic nitrogen, NO2-N, NH3-N oxidized into NO3--N. The effluent quality was good enough to meet the standards of miscellaneous and landscaping water.The ozonation didn’t decrease the total amount of organic matters, but changed molecule structure and character of them. The organic matters with high molecule weight and unsaturated functions were oxidated into those with lower molecule weight and saturated functions. The biodegradability of organic matters was increased, with BDOC increasing from 0.725 mg/L to 1.917 mg/L as the result. Most of the organic matters in raw water were those with aromatic, carboxyl groups and hydrocarbon chains, and after ozonation, the amount of biodegradable matters such as lipid, carboxyl and aliphatic substances was increased.It was also revealed that biomass in the biological activated carbon bed decreased correspondingly with the depth of carbon bed, and the biomass mainly centralized at the upper and middle of filtering bed. Similarly, the removal efficacy of organic mattersdecreased when the depth of carbon layer increased. The removal amount of TOC and BDOC by BAC was 1.142 mg/L and l.206mg/L, respectively, and the two values was so close, which demonstrated that biodegradable organic matters were mainly removed by metabolism, and undegradable organic matters still remained in the form of TOC. The above result was in accordance with the analysis results of GC-MS.更多还原