环境工程学报2012，Vol.6Issue(8)：2830-2836,7.
利用剩余活性污泥生产一次性可降解材料
Production of disposable biodegradable materials from excess activated sludge
摘要
Abstract
This study was carried out to supply a new option for resource utilization of excess activated sludge in urban wastewater treatment plants by making disposable biodegradable material. The excess activated sludge was acclimated for 10 d by SBR systems, and then 4.0 g/L of sodium acetate was added as the precursor for polyhydoxyalkanoates （PHA） accumulation in the acclimated sludge, with aerobic fermentation at 30~C for 10 h. The maximum yield of PHA was 1 125 mg/L, accounting for 35.7% of the mixed liquor suspended solids （MLSS）. After centrifugation, drying and mixing, the sludge was molded into disposable biodegradable materi- als such as disposable flowerpot. To optimize the formula of the biodegradable material, orthogonal experiment was conducted. The results showed that the optimum ratios of raw materials were 57% of dry sludge, 20% of straw fiber, PVA 19% , 2% of barium stearate and 2% of CaO, respectively. The results also indicated that the optimum condition was 100~C and heating of 1.5 h, then the product had the best compressive strength and ten- sile strength. Meanwhile, no virus was detected in the product. The heavy metal of flowerpot could also meet the requirements of national standard in agricultural sludge. The biodegradable property of the flowerpot was also ac- cordant with the requirement of biodegradable materials. Therefore, disposable biodegradable flowerpot in this study was valuable in advanced development and application.关键词
剩余活性污泥/可降解材料/模压成型/花盆Key words
excess activated sludge/biodegradable materials/compressed molding/flowerpot分类
资源环境引用本文复制引用
庞旭,胡文,锋蔡宏,欧阳友生,施庆珊,张长勇,疏秀林..利用剩余活性污泥生产一次性可降解材料[J].环境工程学报,2012,6(8):2830-2836,7.基金项目
华南农业大学校长基金 （）
广东省科技厅工业高新技术产业化项目 （）
广东省国际合作项目 （）
