Ali Mujahid, Huang Qunxing, Lin Bingcheng, Hu Binhang, Wang Fei, Chi Yong
a State Key Laboratory of Clean Energy Utilization , Zhejiang University , Hangzhou , People's Republic of China.
Environ Technol. 2018 Oct;39(20):2632-2640. doi: 10.1080/09593330.2017.1363296. Epub 2017 Aug 18.
The aim of this paper is to present the effect of hydrolysis treatment on the thermal reaction characteristics of sludge and the leaching test of heavy metals contained in the sludge. Raw and hydrolysis-treated sludge (at temperature of 200°C and pressure 0.4 MPa) samples were collected from local municipal sewage sludge treatment plant. Thermogravimetric analysis was carried out between 25°C and 900°C at the heating rate of 10°C/min and 20°C/min under incineration and pyrolysis atmospheres. The leaching behavior of toxic heavy metals in the sludge was studied along with ash composition. The heating rate significantly changed the thermogravimetric and differential thermogravimetric curve profiles for studied fuels under different atmospheres. After hydrolysis treatment, the heavy metals of hydrolysis-treated sludge becomes more stable. The leaching concentration of Cr, Mn, Cu and Pb in hydrolysis-treated sludge were greatly reduced, when compared to raw sludge; however, no significant change was observed in Cd concentration. The X-ray diffraction pattern of bottom ash of hydrolysis-treated sludge was significantly reduced than raw sludge. This decrease is due to possible reduction in grain growth, which degrades the crystallinity of hydrolyzed sludge, implying that the hydrolysis treatment of sewage sludge could be a promising and beneficially safe disposal technology.
本文旨在介绍水解处理对污泥热反应特性的影响以及污泥中重金属的浸出试验。从当地城市污水污泥处理厂采集了未经处理的原始污泥和经过水解处理的污泥（温度为200°C，压力为0.4 MPa）样本。在25°C至900°C之间，以10°C/分钟和20°C/分钟的升温速率，在焚烧和热解气氛下进行热重分析。研究了污泥中有毒重金属的浸出行为以及灰分组成。升温速率显著改变了不同气氛下所研究燃料的热重曲线和微商热重曲线轮廓。经过水解处理后，水解处理污泥中的重金属变得更加稳定。与原始污泥相比，水解处理污泥中铬、锰、铜和铅的浸出浓度大幅降低；然而，镉浓度未观察到显著变化。水解处理污泥底灰的X射线衍射图谱比原始污泥显著降低。这种降低可能是由于晶粒生长减少，从而降低了水解污泥的结晶度，这意味着污水污泥的水解处理可能是一种有前景且有益的安全处置技术。
