摘要
采用NaOH溶液处理天然稻草,通过设计响应面试验,研究在不同碱处理条件对稻草的反硝化能力(DP)影响,以期为低碳污水提供一种廉价碳源;并结合扫描电镜(SEM)表征稻草碱处理前后表面形态改变情况,探究碱预处理稻草机理。结果表明,处理温度、处理时间和NaOH浓度因素对稻草DP成正相关,液固质量比仅在低水平(<40)下对碱预处理有影响;各因素对DP影响大小为处理时间>NaOH浓度>温度,优化条件为:处理时间24 h,处理温度18.5℃,NaOH浓度0.375 mol/L。在优化处理条件下,稻草的DP为128.6 mg/g。NaOH溶液可有效破坏稻草表面果胶和蜡质层,处理后的稻草组织间隙和中间孔腔增大,比表面积增加,有利于微生物与稻草中纤维素接触,从而显著增强其反硝化潜力。
In order to provide a cheap carbon source for the treatment of wastewater with low carbon ratio, Through response surface method, the effect of various conditions on denitrification potential （DP） was studied using NaOH-pretreatment of straw; The mechanisms for straw pretreatment were further studied using SEM to analyze morphology change of straw before and after treatment. Test results showed that temperature, processing time and NaOH concentration had positive correlations with DP. Process time had most significant influences on DP, followed by NaOH concentration and temperature. The best treatment conditions were under temperature 18.5 ℃, processing time 24 h and NaOH concentration 0.375 mol/L and highest DP could reach 128.6 mg/g. SEM results indicated that NaOH could destroy pectin structure of straw surface and enlarge the gap of lignin and cellulose, which could increase the straw＇s availability for microorganism and significantly improve its DP.
出处
《水处理技术》
CAS
CSCD
北大核心
2012年第12期25-29,共5页
Technology of Water Treatment
基金
国家科技支撑计划:长三角城乡一体化村镇高效节地环境治理技术集成与示范(2012BAJ21B05)
关键词
稻草
碱处理
反硝化
碳源
污水处理
响应面分析
alkali-pretreatment
denitrification
carbon source
wastewater treatment
response surface analysis
