腐殖质对污水污泥堆肥过程中 Cu 和 Zn 生物可利用性的影响。
Influence of humic substances on bioavailability of Cu and Zn during sewage sludge composting.
机构信息
College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China.
出版信息
Bioresour Technol. 2011 Sep;102(17):8022-6. doi: 10.1016/j.biortech.2011.06.060. Epub 2011 Jun 23.
Influence of humic substances (HS) on bioavailability of Cu and Zn was characterized during 120 days co-composting of sewage sludge and maize straw. At the initial stage of composting, Cu and Zn in sewage sludge were released as organic matter was degraded, and water soluble Cu and Zn increased markedly. Water soluble Cu and FA content decreased after 21 days whereas water soluble Zn increased during the whole process. Both HA-Cu and HA-Zn were significantly and positively correlated with HA and H/F, respectively. At the end of composting, the distribution coefficients of HA-Cu and HA-Zn reached 27.50% and 3.33% respectively with HA-Cu/HA-Zn ratio increased from 1.29 to 2.73. The results suggest that Cu combined with HA more strongly than Zn, and composting treatment could decrease bioavailability of Cu markedly.
腐殖质（HS）对铜（Cu）和锌（Zn）生物有效性的影响在污水污泥和玉米秸秆共堆肥 120 天期间得到了研究。在堆肥的初始阶段，随着有机物的降解，污水污泥中的 Cu 和 Zn 被释放出来，水溶性 Cu 和 Zn 显著增加。21 天后，水溶性 Cu 和 FA 含量下降，而整个过程中水溶性 Zn 增加。HA-Cu 和 HA-Zn 分别与 HA 和 H/F 呈显著正相关。堆肥结束时，HA-Cu 和 HA-Zn 的分配系数分别达到 27.50%和 3.33%，HA-Cu/HA-Zn 比值从 1.29 增加到 2.73。结果表明，Cu 与 HA 的结合强度大于 Zn，堆肥处理可显著降低 Cu 的生物有效性。
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