Conversion to Biodegradable Polylactic Acid and High Speed Methane Fermentation of Paper Manufacture Sludge with Sub-Critical Water Treatment

亚临界水处理造纸污泥转化为可生物降解聚乳酸和高速甲烷发酵

基本信息

批准号：
13480180
负责人：
YOSHIDA Hiroyuki
金额：
$ 9.73万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

The objective of this work is to develop zero emission conversion technologies of paper manufacture sludge to resources or energy with sub-critical water treatment.Pulp sludge was processed with sub-critical and supercritical water using a small batch reactor, and the effect of temperature and reaction time on the products and their amounts were tested. The soluble products showed maximum amounts around 570 K in sub-critical region. The reaction time was enough in 5-20 minutes. In water-phase, sugar such as cellobiose, glucose, fructose, and erythrose and organic acids such as glycolic acid, lactic acid, formic acid, acetic acid, levulinic acid, and propionic acid existed. We also used filter paper, which was pure cellulose, for sub-critical water treatment to compare the above. According to these detail experiments, the reaction mechanism was proposed.Furthermore, using commercial ion exchange resins and the chitosan adsorbent, which we developed, we tried to develop economical separation method of the products obtained by sub-critical water treatment of pulp sludge. Equilibria, adsorption rate, breakthrough curves, and elution curves for single component systems and multi-component systems were experimentally and theoretically investigated in detail. We found that these components could be separated by using the adsorbents.We tested the possibility of speeding up the methane fermentation rate drastically by treating pulp sludge with sub-critical water. We used an aqueous acetic acid solution as a model solution and the solution obtained by treating the pulp sludge with sub-critical water and made clear that the sub-critical water treatment before methane fermentation increased the fermentation rate 10 times.

这项工作的目的是开发通过亚临界水处理将造纸污泥转化为资源或能源的零排放技术。使用小型间歇反应器用亚临界和超临界水处理纸浆污泥，并研究温度和压力的影响。测试了产物的反应时间及其量。可溶产物在亚临界区 570 K 附近显示出最大量。反应时间5-20分钟就足够了。在水相中，存在纤维二糖、葡萄糖、果糖、赤藓糖等糖类和乙醇酸、乳酸、甲酸、乙酸、乙酰丙酸、丙酸等有机酸。我们还使用滤纸（纯纤维素）进行亚临界水处理来与上述进行比较。根据这些详细的实验，提出了反应机理。此外，利用商业离子交换树脂和我们开发的壳聚糖吸附剂，我们尝试开发纸浆污泥亚临界水处理所得产物的经济分离方法。对单组分系统和多组分系统的平衡、吸附速率、突破曲线和洗脱曲线进行了详细的实验和理论研究。我们发现这些成分可以通过使用吸附剂来分离。我们测试了通过用亚临界水处理纸浆污泥来大幅加快甲烷发酵速率的可能性。我们使用乙酸水溶液作为模型溶液以及用亚临界水处理纸浆污泥得到的溶液，结果表明甲烷发酵前的亚临界水处理使发酵速率提高了10倍。