Laboratory for Agricultural Wastes Treatment and Recycling, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, China.
Appl Biochem Biotechnol. 2011 Jun;164(3):268-82. doi: 10.1007/s12010-010-9133-7. Epub 2010 Nov 30.
Digested slurry samples from twenty-one large-scale anaerobic digestion plants together with intensive pig and dairy farms in Jiangsu Province of China were collected and analyzed for total and dissolved concentrations of Zn, Cu and As, as well as chemical characteristics. The results showed that total concentrations of Zn, Cu and As in digested pig slurries were concentrated to <10, <5 and 0.02-0.1 mg/l, respectively; while <2 and 10-30, <1, and 0.02-0.1 mg/l, respectively, in digested dairy slurries. Lowering the dietary supply of these elements to pig and dairy would be the most effective way to control heavy metal contents in digested manure slurries. Dissolved fractions of Zn, Cu and As accounted for 1-74%, 1-33% and 2-53% of the total concentrations, respectively, in digested pig slurries; and 18-65%, 12-58% and 3-68% in digested dairy slurries. The chemical fractions of heavy metals in digested slurries were not only dependent on the total concentrations of heavy metals in raw manures but also on conditions of digestion and storage. Oxidation pond systems could significantly cripple the total contents of heavy metals in digested slurries, and the removal effect was better in multi-oxidation-pond systems than that in primary-oxidation-pond systems. However, the chemical fractions of heavy metals in digested slurries changed in a complicated manner when stored in oxidation ponds, due to the suspended solid deposition, elements reduction, as well as variations of pH values and oxidation-reduction potential.
采集了中国江苏省 21 座大型厌氧消化厂和集约化养猪场、奶牛场的消化浆样品，分析了总浓度和溶解浓度的 Zn、Cu 和 As，以及化学特性。结果表明，消化猪浆中 Zn、Cu 和 As 的总浓度分别浓缩至<10、<5 和 0.02-0.1mg/L；而消化奶牛浆中分别为<2 和 10-30、<1 和 0.02-0.1mg/L。降低猪和奶牛的这些元素的膳食供应将是控制消化粪便浆中重金属含量的最有效方法。消化猪浆中 Zn、Cu 和 As 的溶解分数分别占总浓度的 1-74%、1-33%和 2-53%；消化奶牛浆中分别占 18-65%、12-58%和 3-68%。消化浆中重金属的化学形态不仅取决于原料粪便中重金属的总浓度，还取决于消化和储存条件。氧化塘系统可以显著削弱消化浆中重金属的总含量，多级氧化塘系统的去除效果优于一级氧化塘系统。然而，由于悬浮固体沉积、元素还原以及 pH 值和氧化还原电位的变化，重金属在消化浆中的化学形态在氧化塘中储存时会以复杂的方式变化。
