The Applicability of the Acid Mine Drainage Sludge in the Heavy Metal Stabilization in Soils

Abstract

BACKGROUND: Recent studies using various industrial wastes for heavy metal stabilization in soil were conducted in order to find out new alternative amendments. The acid mine drainage sludge(AMDS) contains lots of metal oxides(hydroxides) that may be useful for heavy metal stabilization not only waste water treatment but also soil remediation. The aim of this study was to investigate the applicability of acid mine drainage sludge for heavy metals stabilization in soils METHODS AND RESULTS: Alkali soil contaminated with heavy metals was collected from the agricultural soils affected by the abandoned mine sites nearby. Three different amounts(1%, 3%, 5%) of AMDS were applied into control soil and contaminated soil. For determining the changes in the extractable heavy metals, CaCl 2 and Mehlich-3 were applied as chemical assessments for metal stabilization. For biological assessments, lettuce(Lactuca sativa L.) and chinese cabbage(Brassica rapa var. glabra)

The Effects of Various Amendments on Trace Element Stabilization in Acidic, Neutral, and Alkali Soil with Similar Pollution Index

“…Compared with the SS and WL, the AMDS did not change the soil pH significantly. Nevertheless, the Cd bioavailability also decreased as in previous explanations of adsorption mechanisms [20]. However, compared with acidic and neutral soils, the pH of alkali soil had high representation of low Cd bioavailability.…”

“…The AMDS, the highly concentrated trace elements sludge from the acid mine drainage treatment plant and the organic materials, BM, PM, and SCGC showed high LOI indexes compared with SS and WL. Though the contents of Cd and Zn in the AMDS were high, the effectiveness of AMDS seems to be considerable because the leaching of Cd and Zn was negligible in the experiment and in previous studies using the same AMDS [20]. …”

“…In oxic-soil conditions, as in agricultural upland soil, arsenate was the main chemical species of As in anion forms (H 2 AsO 4 - , HAsO 4 2- ) and easily adsorbed onto Ca -, Fe -, Al—oxides and clay surface sites in soil solid phase [25]. The AMDS used in this study included the sludge from treatment plants where the main process involved the additions of Ca on acid mine drainage resulting in coagulation and precipitation, and the AMDS also contained a large amount of Fe with oxides [20] that might have caused efficient As stabilization. Furthermore, the SS and WL containing Ca and Fe oxides were also good at stabilizing As in the soil [25].…”

“…After seed germination in the soil, the early growth stage of plants has been deemed important for the continuous growth of plants, and relevant experiments have been studied on various research fields [20, 31]. Bok choy was cultivated on amended soil over 2 weeks, and the shoots or edible parts of bok choy were analyzed (Table 3).…”

The Effects of the Short-term Cultivation and Incorporation of Legume Green Manures on the Chemical Properties of Soil Contaminated with Heavy Metals

“…또한 석회 석을 처리하였을 때 토양의 pH는 8을 초과하였고 (Table 3), 3종류 녹비작물 모두에서 As, Cd, Pb, Zn의 흡수량은 모두 감소하였다( Table 2). 석회석의 주된 성분인 Ca은 pH 7-9 조 건에서 As를 안정화하는 것으로 알려져 있다 (Sadiq, 1997 (Helyar, 1976;Kim et al, 2014). 석회석처리 토양(Lime)에서도 녹비 환원 시 토양의 pH가 증가하였으나 초기 토양의 pH가 높아 그 상승 정도는 미미하였다.…”