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污泥含有丰富的有机质和植物所需的营养元素,将污泥堆肥后用作苗木栽培基质逐渐成为新型的污泥生态化处置途径.通过7个月的盆栽试验,研究污泥堆肥不同添加量,即0%(CK)、25%(T_1)、50%(T_2)、75%(T_3)、100%(T_4)对黄粱木幼苗生长及营养元素和重金属吸收的影响,以及栽培后基质中元素变化特征.结果表明:污泥堆肥添加量对黄梁木生长有显著影响,纯污泥(T_4)中黄梁木苗木不能正常生长,移栽两周后植株全部死亡,而T_1、T_2和T_3处理则显著增加了黄梁木株高、地径和总生物量,其中,T_2处理效果最佳,3个生长指标均显著高于其他处理;T_2、T_3处理显著促进黄梁木对N、P、K以及重金属(Cu、Zn、Pb、Cd)的吸收,而T_1处理仅对N和Pb吸收有显著促进作用;同一处理条件下,黄梁木对污泥堆肥重金属吸收能力表现为Zn>Cu>Pb>Cd.盆栽试验结束时,污泥混合基质中有机质,以及N、P、K含量较高,但仍残留一定量重金属,不过均低于农用污泥污染物控制标准,具有再次利用的价值.
Sludge is rich in organic matter and nutrient elements needed by plants, and it is becoming a new way of sludge ecological treatment after sludge composting is used as seedling culture substrate. Through 7-month pot experiment, , Ie, the effects of 0%, 25%, 50%, 75% and 100% on the growth of seedlings and the absorption of nutrients and heavy metals in yellow sorghum seedlings, The results showed that the addition of sludge compost had a significant effect on the growth of Huangliangmu, but the Huangguang seedlings could not grow normally in the pure sludge (T_4). All the plants died after two weeks of transplanting, while T_1, T_2 and T_3 The treatments of T 2 and T 3 significantly increased the plant height, diameter and total biomass of Huang Liang Mu. Among them, T 2 treatment had the best effect and the three growth indexes were significantly higher than those of other treatments. And the absorption of heavy metals (Cu, Zn, Pb and Cd), while T 1 treatment only promoted the absorption of N and Pb. Under the same treatment conditions, Cd. At the end of the pot experiment, the organic matter in the sludge mixed matrix and the higher N, P and K contents, However, a certain amount of heavy metal remains, but all are lower than the control standard of agricultural sludge pollutants and have the value of reuse.