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  • 學位論文

翻土混合稀釋法對受重金屬鉻污染農地土壤整治復育成效之研究

Evaluation on Remediation Performance of Soil Mixing in Chromium-contaminated Farmlands

指導教授 : 章裕民
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摘要


國內多處農地土壤因長期引用受污染灌溉水源,而遭受程度不一的重金屬污染。環保機關對於遭受污染之農地,除了公告列管與採取緊急必要措施外,並進行整治復育工作,以恢復農地原有使用用途。因此本研究以嘉義市A與B兩處受重金屬鉻污染場址為例,藉由資料蒐集,透過土壤重金屬之污染調查與分析結果,評析「翻土混合稀釋法」對受重金屬鉻污染之農地土壤整治復育成效。研究結果顯示,採用「翻土混合稀釋法」整治受重金屬鉻污染之農地,A場址與B場址的改善率分別為87.13%與96.45%。此外,由整治後之土壤地力回復結果,得知兩處場址的pH值、有效性磷及鉀飽和度均呈上升情形,其中A場址的pH值、鉀飽和度及有機質含量未達地力回復標準,但經施以石灰及有機質肥料後,已達地力回復標準;而B場址的有機質含量雖有下降情形,但仍達地力回復標準。兩處場址經整治後,重金屬鉻可低於土壤污染監測標準值,且經復育後可符合地力回復之基本標準。整治期間之周界空氣品質監測項目之TSP及PM10測值均低於空氣品質標準值;噪音振動監測值均符合相關法規值,未造成環境二次污染。 根據本研究結果發現「水平稀釋及深層垂直翻土混合稀釋並用法」改善率(96.45%)較「淺層垂直翻土混合稀釋法」改善率(87.13%)略高,皆可做為受重金屬鉻污染農地土壤的優先整治方法。但該工法並未將重金屬自土壤系統中移除,建議後續研究新穎的整治技術,以達農地農用及地盡其力的目標。

並列摘要


There are many farmlands in Taiwan contaminated with various levels of heavy metals due to long term use of contaminated irrigation water sources. In order to restore the original use of farmland, environmental protection authorities had announced contaminated farmlands as Control Sites, took necessary response measures, and also carried out remediation processes. Two sites A and B with chromium contamination in Chia-Yi City, Taiwan, were selected as examples in this research. Investigation and analysis results of soil heavy metal pollution were collected to evaluate and analyze the remediation performance of soil mixing in chromium-contaminated farmlands. As shown in research results, the removal rate of site A and site B, which both used soil mixing method, is 87.13% and 96.45%. In addition, the results of soil fertility restoration has shown that pH values, available phosphorous, and degrees of potassium saturation of both sites all increased. The pH value, degree of potassium saturation, and organic matter content of site A did not reach fertility restoration standard, but it had been reached after the application of lime and organic fertilizer. Although the organic matter content of site B decreased but it still reached fertility restoration standard. After the remediation of both sites, chromium contamination has been reduced below the soil pollution monitoring standards, and has matched the basic standard of fertility restoration. There was no secondary pollution caused in environment during the remediation, since the TSP and PM10 value of ambient air quality monitor are below air quality standards, and noise and vibration monitoring value both under the relevant legislation. According to the results in this research, the removal rate of soil mixing method by using the combination of horizontal and vertical mixing for deep soil (96.45%) is slightly higher than the vertical mixing for shallow soil (87.13%). It is suggested that both types of soil mixing method can be in the front of the priority list of chromium-contaminated farmland remediation method. As these methods did not remove heavy metals from soil, it is recommended that new remediation methods can be developed so that the use of farmland can be completed, and the benefit of land can be accomplished.

並列關鍵字

soil mixing heavy metal chromium soil remediation

參考文獻


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