| 张斌,黄丽,张克强,叶涛,杜连柱,秦璠琦.皂角苷对几种生活污泥中Cu和Zn的去除[J].农业环境科学学报,2016,35(6):1180-1187. |
| 皂角苷对几种生活污泥中Cu和Zn的去除 |
| Removal of Cu and Zn from sewage sludge by saponin |
| 投稿时间：2015-12-11 |
| DOI：10.11654/jaes.2016.06.022 |
| 中文关键词: 皂角苷 重金属 生活污泥 淋洗 |
| 英文关键词: saponin heavy metal sewage sludge washing |
| 基金项目:公益性行业专项(201303101);农业部环境保护科研监测所省部级重点实验室开放基金 |
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| 中文摘要: |
| 为探讨皂角苷对污泥中Cu和Zn去除的机制,采用化学淋洗的方法研究皂角苷浓度(0~7%)、pH(2~6)、振荡时间(0~48 h)、温度(10、25、40 ℃)和提取次数(1~4次)对四种生活污泥中Cu和Zn去除率的影响,分析去除前后重金属的形态,并监测去除过程中浸出液pH的变化。结果表明,单次淋洗条件下,皂角苷对Cu的去除率大于Zn;皂角苷溶液的pH对Cu的去除没有显著影响,而Zn的去除率在pH下降到2时明显增加;Cu经过6~12 h的振荡就能达到最大去除,Zn则需要经过较长时间的振荡(48 h)才能达到较好去除;提高振荡温度,Cu的去除率降低而Zn的增加;随着提取次数的增加,Cu和Zn的去除率均增加,Cu的去除以第1次提取为主,Zn的4次提取均有较好效果,用3%的皂角苷溶液连续4次提取后,Cu和Zn的累积去除率最大分别达到32.61%和39.32%;增加振荡时间、提高振荡温度、增加提取次数以及降低皂角苷溶液pH均能降低浸出液的pH。经过3%的皂角苷溶液的提取,污泥中各形态Cu的含量均减少,其中66%以上的酸溶态被去除;而Zn的酸溶态含量减少不明显,可还原态、可氧化态和残渣态均有所降低,但以残渣态的减少为主。 |
| 英文摘要: |
| A chemical washing experiment was conducted to investigate the performance and mechanism of Cu and Zn removal from four types of sewage sludge by saponin. The effects of various factors such as saponin concentration(0~7%), pH(2~6), contact time(0~48 h), temperature(10, 25, 40 ℃), and washing number(1~4) on Cu and Zn removal and the changes of heavy metal distribution before and after washing were examined. The pH changes of effluent during the removal of Cu and Zn from sewage sludge was also monitored. In single washing, the removal efficiency of Cu was better than that of Zn. The pH of saponin solution had no significant effect on the removal of Cu, whereas higher removal efficiency of Zn was obtained when pH was decreased to 2. The maximum Cu removal was achieved when the reaction time was 6~12 h. However, a better removal of Zn needed a longer reaction time(48 h). With increasing temperature, the removal efficiency of Cu was decreased but that of Zn was increased. The cumulative efficiencies of Cu and Zn removal were increased with increasing number of washing. The removal of Cu mainly happened at the first washing, while the Zn removal remained good during all 4 washing. Four washing with 3% saponin at natural pH removed Cu and Zn by 32.61% and 39.32%, respectively. The effluent pH decreased with increases in contact time, temperature, and number of washing but with decreases in pH values of saponin solution. After washing with 3% saponin, all fractions of Cu were reduced, with acid soluble fraction being removed more than 66%, while Zn fractions(reducible, oxidizable, and residual) except acid soluble fraction showed decreases, with the most reduction found in residual fraction. |
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