Abstract

Incinerated biomedical waste ash (IBWA) contains an abundance of polyaromatic hydrocarbons (PAHs), heavy/toxic metals and, is highly alkaline in nature. To tackle the problems that could be caused by these PAHs, heavy metals, or alkalinity, a disposal treatment must be given to IBWA before its landfilling or before putting it into use, to avoid disrupting the balance of the landfill site. This study is conducted to reduce the alkalinity and heavy metal leaching from IBWA using an alkaliphilic bacterium. Bacterium Bacillus halodurans strain (NCIM 5439) grew well at pH values of 8 − 11 pH, the temperature of 25-45 °C. When IBWA comes in contact with water or fluids, leachate generated is alkaline and is harmful in nature. Dumping of IBWA also caused an increase in the pH of groundwater as leachate generated from IBWA, can penetrate the environment. Leaching assessment of the IBWA is must be done to evaluate the hazardous capacity of the material due to alkalinity and heavy metals present in it. Bacterium Bacillus halodurans strain reduced the alkalinity and heavy metal concentration in IBWA and showed promising results and possible solution to the problem of leachate. U.S.EPA’s Toxicity characteristic leaching procedure (TCLP) test was performed to investigate its toxicity.

摘要

焚烧的生物医学废物灰 (IBWA) 含有丰富的多环芳烃 (PAHs)、重金属/有毒金属，并且在性质上呈强碱性。为了解决这些PAHs、重金属或碱度可能引起的问题，IBWA必须在填埋前或投入使用前进行处置，以免破坏填埋场的平衡。本研究旨在使用嗜碱细菌减少 IBWA 的碱度和重金属浸出。嗜盐芽孢杆菌菌株 (NCIM 5439) 在 8 - 11 pH 的 pH 值、25-45 °C 的温度下生长良好。当 IBWA 与水或液体接触时，产生的渗滤液呈碱性，对自然界有害。倾倒 IBWA 还导致地下水的 pH 值升高，因为 IBWA 产生的渗滤液可以渗透到环境中。必须对 IBWA 进行浸出评估，以评估材料中存在的碱度和重金属造成的危险能力。Bacterium halodurans菌株降低了 IBWA 中的碱度和重金属浓度，并显示出有希望的结果和可能解决渗滤液问题的方法。USEPA 的毒性特征浸出程序 (TCLP) 测试用于调查其毒性。