超声辅助酸淋洗对制革污泥Cr的浸出及形态转化影响研究
Chromium Liberation and Speciation from Tannery Sludge by Ultrasond-assisted Acid Leaching
作者：马宏瑞, 李晓洁, 陈丰羽, 朱超, 王晴, 陈湘萍, 黄彬
Author：MA Hongrui, LI Xiaojie, CHEN Fengyu, ZHU Chao, WANG Qing, CHEN Xiangping, HUANG Bin
收稿日期：2019-06-10 年卷（期）页码：2020,30(1):7-12
期刊名称：皮革科学与工程
Journal Name：Leather Science and Engineering
关键字：制革污泥,残渣态Cr,超声,浸提率,
Key words：tannery sludge,residual Cr,ultrasound,leaching efficiency,
基金项目：国家水体污染控制与治理科技重大专项; （2017ZX07602-001）及国家自然科学基金（51704189）
中文摘要
针对制革含铬污泥中残渣态Cr难以通过酸淋洗达到高效回收的问题,现提出超声协同酸浸提的工艺方案高效实现污泥的无害化及Cr的回收。随着超声波处理时间的延长,对残渣态Cr的提取效率有所提高。在以0.5 mol/L硫酸为浸提剂1800 W下超声40 min,此时污泥上清液TOC值从937.5 mg/L增加至1581.4 mg/L,VSS由49.9%减少至10%。Cr的浸提率高达90.61%,残渣态Cr可减少至4.4 mg/g干泥,表明超声波作用强化了酸对残渣态Cr的提取,具有明显的协同效应。超声协同酸浸提的工艺方案为制革污泥中残渣态Cr相互包夹的复杂结构提供了一种高效、可行的破解方案。
英文摘要
The residual Cr in tannery sludge cannot be recovered efficiently by traditional acid leaching. To resolve the problem, a process scheme of ultrasonic assisted acid leaching was proposed to realize the harmlessness of tannery sludge and the efficient recovery of Cr . The results indicated that the removal of Cr by acid leaching increased with the duration of ultrasonic treatment. Total organic carbon (TOC) raised from 937.5 mg/L to 1571.4 mg/L under the condition of 0.5 mol/L H2SO4, ultrasonic power of 50% (1800 W) and leaching time of 40 min, while VSS declined from 49.9% to 10%, leaching efficiency of Cr reached 90.61%, and the residual Cr could be reduced to less than 4.4 mg/g. The results verified that ultrasonication obviously intensified the efficiency of acids extraction of Cr from sludge with significant synergic effect. The ultrasonic assisted acid leaching process provides an efficient and feasible solution for the breakdown of complex structure and the release of residual Cr in the tannery sludge.
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