Sethi Sapna, Kothiyal N C, Nema Arvind K
J Environ Sci Eng. 2012 Jul;54(3):323-30.
Leachate recirculation at neutral PH accompanied with buffer/nutrients addition has been used successfully in earlier stabilization of municipal solid waste in bioreactor landfills. In the present study, efforts were made to enhance the stabilization rate of municipal solid waste (MSW) and organic solid waste (OSW) in simulated landfill bioreactors by controlling the pH of recirculated leachate towards slightly alkaline side in absence of additional buffer and nutrients addition. Enhanced stabilization in waste samples was monitored with the help of analytical tools like Fourier Transform Infrared Spectroscopy (FTIR) and X-Ray Diffraction (XRD). Predominance of bands assigned to inorganic compounds and comparatively lower intensities of bands for organic compounds in the FTIR spectra of waste samples degraded with leachate recirculation under controlled pH confirmed higher rate of biodegradation and mineralization of waste than the samples degraded without controlled leachate recirculation. XRD spectra also confirmed to a greater extent of mineralization in the waste samples degraded under leachate recirculation with controlled pH. Comparison of XRD spectra of two types of wastes pointed out higher degree of mineralization in organic solid waste as compared to municipal solid waste.
在中性pH值下进行渗滤液再循环并添加缓冲剂/营养物质，已成功用于生物反应器填埋场中城市固体废物的早期稳定化处理。在本研究中，在不添加额外缓冲剂和营养物质的情况下，通过将再循环渗滤液的pH值控制在微碱性一侧，努力提高模拟填埋生物反应器中城市固体废物（MSW）和有机固体废物（OSW）的稳定化速率。借助傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）等分析工具监测废物样品中增强的稳定化情况。在受控pH值下通过渗滤液再循环降解的废物样品的FTIR光谱中，归属于无机化合物的谱带占主导，而有机化合物谱带的强度相对较低，这证实了与未进行受控渗滤液再循环降解的样品相比，废物的生物降解和矿化速率更高。XRD光谱也在很大程度上证实了在受控pH值下通过渗滤液再循环降解的废物样品中的矿化程度更高。两种类型废物的XRD光谱比较指出，有机固体废物中的矿化程度高于城市固体废物。
