PDF(Pubmed)
Abstract：
Many biomass wastes or their modified forms have been investigated as heavy metal adsorbents. However, less emphasis has been placed on post-adsorbent management or possible further utilization. In this study, biochar (BC) derived from modified bamboo adsorbent after the adsorption of Cu from an aqueous solution was used for the in situ remediation of lake sediment contaminated with Cd and Cu. The results indicated that the Cu concentration was extremely low (≤0.015 mg/L), while Cd was not detected in the overlying water or the interstitial water after the 90-day BC treatment. The pH value (7.5-8.1) slightly increased, and the toxicity characteristic leaching procedure (TCLP) leachability of the Cu and Cd in the sediment decreased overall. Cu and Cd were preferentially transformed into more stable species. The findings highlighted the potential possibility of BC derived from post-adsorbent being used for sediment remediation. However, the BC addition produced significant effects on the sediment microbial activity and community structure. In general, with an increase in BC, the urease activity increased, while the alkaline phosphatase and invertase activity decreased, which could be attributed to the BC itself. In addition, significant changes in both bacterial and fungal genera were observed. Hence, a cautious approach should be taken in the practical application of BC.
摘要：
已经研究了许多生物质废物或其改性形式作为重金属吸附剂。然而,不太重视后吸附剂管理或可能的进一步利用。在这项研究中,从水溶液中吸附Cu后，改性竹子吸附剂衍生的生物炭（BC）用于原位修复受Cd和Cu污染的湖泊沉积物。结果表明,Cu浓度极低(≤0.015mg/L),而在90天BC处理后，在上覆水或间隙水中未检测到Cd。pH值（7.5-8.1）略有增加，沉积物中Cu和Cd的毒性特征浸出过程（TCLP）浸出性总体下降。Cu和Cd优先转化为更稳定的物种。研究结果强调了源自后吸附剂的BC用于沉积物修复的潜在可能性。然而,BC添加对沉积物微生物活性和群落结构产生显著影响。总的来说,随着BC的增加，脲酶活性增加，而碱性磷酸酶和转化酶活性下降，这可以归因于BC本身。此外,观察到细菌和真菌属的显着变化。因此，在BC的实际应用中应采取谨慎的方法。
