- 期刊
- OpenAccess
以廚餘堆肥化之液肥復育鋅污染土壤與地力回復之研究
Reclamation of Zinc-contaminated Soil Using Dissolved Organic Matter Solution Prepared from Liquid Fertilizer of Food Waste Composting
摘要
使用酸洗法處理重金屬污染之土壤是一種常見的方式；雖可移除重金屬，但也造成土壤中原有的營養元素因酸洗流失，而影響農作物之生長與生產力。本研究以廚餘液肥，作為土壤整治之清洗液來復育鋅污染土壤，過程中能將液肥所含肥力留存於土壤中減少肥分損失。以pH 2.0液肥清洗液清洗二次後，表土及裡土鋅的移除率分別達45%及23%，可符合600 mg Zn kg^(-1)之食用農地管制標準。比較其肥力變化；經酸性水溶液清洗後之土壤肥力均明顯低於原土樣，而經液肥清洗後土壤肥力明顯提升；表土及裡土之有機質分別增加5.0%及7.5%、銨態氮分別增加120%及40%、有效性磷分別增加65%與63%、交換性鉀分別增加153%與499%。
並列摘要
Soil washing using an acid solution is a common practice for removing heavy metals from contaminated soil in Taiwan. However, significant soil fertility degradation and high operation costs are the major disadvantages of soil washing. Washing soil with a dissolved organic matter (DOM) solution has been identified as a method that can moderate the loss of nutrients in the soil and enhance metal removal. Liquid fertilizer of food waste composting can be used to prepare a dissolved organic matter (DOM) solution. This study .employed DOM solutions to remediate Zn-contaminated soil (with concentrations up to 992 and 757 mg kg^(-1) respectively in topsoil and subsoil) and determine the factors affecting removal of Zn, such as pH, initial concentration of DOM solution, temperature, and washing frequency. When washing with pH 2.0 and 1,500 mg L^(-1) DOM solution twice, about 45% and 23% of Zn were removed from the topsoil and subsoil at 25°C, respectively. With this treatment, the increase in organic matter content ranged from 5.0% to 7.5%; available ammonium (N-NH4) content ranged from 47% to 140%; available phosphorus content ranged from 63% to 65%; and exchangeable potassium content ranged from 153% to 499%.