当前位置: X-MOL 学术Environ. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Suitability of natural and chemically modified peat as a sorbent material for mining water purification in small-scale pilot systems
Environmental Technology ( IF 2.8 ) Pub Date : 2020-09-02 , DOI: 10.1080/09593330.2020.1812007
Elisangela Heiderscheidt 1 , Tiina Leiviskä 2 , Felipe Campos Lopez 1 , Axumawit Tesfamariam 1 , Heini Postila 1
Affiliation  

ABSTRACT

In this study, the suitability of natural peat (Nat-Peat) and HCl-modified peat (M-Peat) as a sorbent for purification of mining water was evaluated in two different small-scale pilot systems: a continuous stirred tank reactor (CSTR) and a horizontal flow filter (HFF). The effect of process parameters (peat type, peat dose, mixing time, mixing intensity) on metal (metalloid) removal in the CSTR system was also investigated. In the CSRT, Nat-Peat achieved higher removal of Ni (<80%) and As (∼61%) than M-Peat (72% and 26% for Ni and As, respectively). In the HFF, Nat-Peat achieved slightly lower maximum removal of Ni (<96%) than M-Peat (<98%) and higher removal of As and Sb (<87% and 8%) than M-Peat (<35% and 7%). Thus, chemical modification (HCl) of peat did not improve its affinity for metal and metalloids. Among the process parameters studied, peat dose exerted the strongest effect on residual concentrations of Ni, As and Sb. Higher removal of Ni and As was achieved in treatment combinations involving high peat dose (2 g/L), mixing time (60 min) and mixing intensity (300 rpm), but the effect of increasing level of these factors was not linear. This study showed that peat can be a viable sorbent material in CSTR systems (followed by sedimentation) if sorbent particle removal can be improved. Use of peat in HFF systems is not viable, due to its inability to cope with large water volumes.



中文翻译:

天然和化学改性泥炭作为吸附剂材料在小型试验系统中用于矿井水净化的适用性

摘要

在这项研究中,在两个不同的小型试验系统中评估了天然泥炭 (Nat-Peat) 和 HCl 改性泥炭 (M-Peat) 作为吸附剂净化矿井水的适用性:连续搅拌罐反应器 (CSTR ) 和水平流过滤器 (HFF)。还研究了工艺参数(泥炭类型、泥炭剂量、混合时间、混合强度)对 CSTR 系统中金属(准金属)去除的影响。在 CSRT 中,Nat-Peat 对 Ni(<80%)和 As(~61%)的去除率高于 M-Peat(Ni 和 As 分别为 72% 和 26%)。在 HFF 中,Nat-Peat 的 Ni 最大去除率(<96%)略低于 M-Peat(<98%),As 和 Sb 去除率(<87% 和 8%)高于 M-Peat(<35 % 和 7%)。因此,泥炭的化学改性 (HCl) 并未提高其对金属和准金属的亲和力。在研究的工艺参数中,泥炭剂量对 Ni、As 和 Sb 的残留浓度影响最大。在涉及高泥炭剂量(2 g/L)、混合时间(60 分钟)和混合强度(300 rpm)的处理组合中实现了更高的 Ni 和 As 去除率,但这些因素水平增加的影响不是线性的。这项研究表明,如果可以改善吸附剂颗粒的去除,泥炭可以成为 CSTR 系统(随后是沉降)中的一种可行的吸附剂材料。在 HFF 系统中使用泥炭是不可行的,因为它无法处理大量的水。但这些因素水平增加的影响不是线性的。这项研究表明,如果可以改善吸附剂颗粒的去除,泥炭可以成为 CSTR 系统(随后是沉降)中的一种可行的吸附剂材料。在 HFF 系统中使用泥炭是不可行的,因为它无法处理大量的水。但这些因素水平增加的影响不是线性的。这项研究表明,如果可以改善吸附剂颗粒的去除,泥炭可以成为 CSTR 系统(随后是沉降)中的一种可行的吸附剂材料。在 HFF 系统中使用泥炭是不可行的,因为它无法处理大量的水。

更新日期:2020-09-02
down
wechat
bug