铝盐在污泥颗粒化进程中的强化作用及其空间分布

发布时间：2018-09-12 14:00

【摘要】：为考察铝盐在好氧颗粒污泥形成过程中的强化作用,通过在不同SBR反应器运行的第10~16天分别投加聚合氯化铝(PAC)和硫酸铝的方式来促进颗粒污泥的形成.探讨不同铝盐混凝剂的投加对颗粒污泥特性的影响,解析铝元素在污泥成长过程中的质量分数变化和空间分布规律.结果表明:铝盐的投加加速了污泥的颗粒化过程,对成熟颗粒污泥中EPS的化学结构有影响;停止加药后,投加PAC的污泥中铝质量分数在16~29 d期间由30.46%降至0.43%,投加硫酸铝的污泥中铝质量分数由45.69%降至13.29%.且在投加PAC之后,其水解产物主要分布在污泥絮体的外围,随着颗粒的成熟,污泥中铝元素的分布低于检测限;而硫酸铝经水解聚合后与污泥充分接触,在整个颗粒均有铝元素分布,颗粒成熟后主要集中在颗粒的中心位置.这说明两种铝盐在颗粒污泥形成过程中的作用可能有所差别,PAC的投加主要是促进污泥EPS的分泌,使微生物聚集;硫酸铝的投加主要是形成晶核并强化EPS的产生,从而加速颗粒污泥的形成.
[Abstract]:In order to investigate the strengthening effect of aluminum salt on aerobic granular sludge formation, the formation of granular sludge was promoted by adding polyaluminium chloride (PAC) and aluminum sulfate into different SBR reactors at 1016 days. The effects of different aluminum salt coagulants on the characteristics of granular sludge were discussed, and the variation of mass fraction and spatial distribution of aluminum in sludge growth were analyzed. The results show that the addition of aluminum salt accelerates the granulation process of sludge and has an effect on the chemical structure of EPS in mature granular sludge. The aluminum content in sludge added with PAC decreased from 30.46% to 0.43 in 1629 days, and the aluminum content in sludge added with aluminum sulfate decreased from 45.69% to 13.29%. After adding PAC, the hydrolytic products mainly distributed in the periphery of sludge floc. With the maturation of particles, the distribution of aluminum in sludge was lower than the detection limit, and aluminum sulfate was in full contact with sludge after hydrolysis and polymerization. The distribution of Al element in the whole particle is mainly concentrated in the center of the particle after maturation. These results suggest that the role of the two aluminum salts in the process of granular sludge formation may be different. The main reason for the addition of PACs is to promote the secretion of EPS from sludge and to accumulate microbes, while the addition of aluminum sulfate is mainly to form the crystal nucleus and strengthen the production of EPS. Thus accelerating the formation of granular sludge.
【作者单位】：西安建筑科技大学环境与市政工程学院;
【基金】：国家自然科学基金(51178377)
【分类号】：X703

【相似文献】