灼烧净水污泥对外源磷的吸附和固定作用

发布时间：2018-05-28 05:03

本文选题：灼烧 + 净水污泥　；参考：《环境科学》2017年09期

【摘要】：研究了不同投加方式下(混匀和覆盖)灼烧净水污泥对外源磷的累积吸附效果,以及吸附外源磷后底泥等温吸附效果和在厌氧条件下内源磷释放情况.结果表明,混匀和覆盖条件下,底泥对上覆水中磷的累积吸附量分别为11.496 mg和11.042 mg,明显高于对照实验(7.219 mg).通过对吸附外源磷后的底泥进行等温吸附实验,发现混匀条件和覆盖条件下磷最大吸附量(Smax)均有所增加,并且前者(7.795 mg·g~(-1))要高于后者(6.807 mg·g~(-1)),但磷平衡浓度(EPC0)前者(0.83mg·L~(-1))却明显大于后者(0.64 mg·L~(-1)),表明混匀条件下内源磷更容易释放.在厌氧环境下,混匀方式内源磷释放量仅为0.93 mg,不仅低于覆盖(1.49 mg),也明显低于对照实验(7.76 mg).覆盖条件下比释放速率的平均值(0.006 14)大于混匀(0.003 96),并均低于对照实验.这说明混匀对内源磷的持留能力更强.暗示了单纯用EPC0值来评价底泥对磷的固定能力是不妥的.
[Abstract]:In this paper, the accumulative adsorption effect of exogenous phosphorus on sewage sludge was studied under different adding methods (mixing and mulching), and the isothermal adsorption effect of sediment and the release of endogenous phosphorus under anaerobic condition were also studied. The results showed that the accumulative adsorption capacity of phosphorus in the overlying water was 11.496 mg and 11.042 mg, respectively, which was significantly higher than that in the control experiment (7.219mg / g). Through the isothermal adsorption experiment of the sediment adsorbed with exogenous phosphorus, it was found that the maximum adsorption capacity of phosphorus (S _ max) increased under the conditions of mixing and covering. The former (7.795 mg / g) was higher than the latter (6.807 mg / g), but the phosphorus equilibrium concentration was 0.83 mg / L ~ (-1), which was significantly higher than that of the latter (0.64 mg / L ~ (-1), indicating that endogenous phosphorus was released more easily under mixed conditions. In anaerobic environment, the endogenous phosphorus release was only 0.93 mg, which was not only lower than that of mulching 1.49 mg / g, but also significantly lower than that of control experiment (7.76 mg / g). The average specific release rate under mulching condition was 0.006.14), which was higher than that of the mixture (0.003 96g), and was lower than that of the control experiment. This indicates that the retention of endogenous phosphorus by blending is stronger. It suggests that it is inappropriate to use EPC0 to evaluate the phosphorus fixation ability of sediment.
【作者单位】：苏州科技大学环境科学与工程学院;
【基金】：国家自然科学基金项目(51278523) 江苏省“六大人才高峰”项目(2013-JNHB-022) 水处理技术与材料协同创新中心项目
【分类号】：X703

【相似文献】