厌氧发酵方式对乳渣废水产酸性能的影响  

Effect of milk residue wastewater anaerobic fermentation method on acidogenicity performance

作　　者：钮劲涛 金宝丹[2] 牛庆中 

机构地区：[1]北京建研环保设备有限公司,北京100029 [2]北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京100124

出　　处：《环境工程学报》2017年第7期4010-4016,共7页Chinese Journal of Environmental Engineering

基　　金：第十三届研究生科技基金资助项目(ykj-2014-10608)

摘　　要：为了研究厌氧发酵方式对乳渣废水发酵产酸效果的影响,分别对乳渣废水采用自然型发酵、填料型发酵及中性型发酵(pH=7.0±0.2),并进行连续2个周期的厌氧反应。分析乳渣废水中可溶性化学需氧量(SCOD)、蛋白质、多糖、挥发性短链脂肪酸(SCFAs)、水解酶(蛋白酶、α-葡萄苷酶)和辅酶420、NH_4^+-N及PO3-4-P指标的变化。研究发现,中性产酸系统中水解酶活性较高,蛋白质和多糖等物质水解性能较好,使乳渣废水产酸性能最佳,最大SCFAs积累量为12 328.37 mgCOD·L^(-1)。自然发酵产酸系统中水解酶活性最低,系统中残留大量的蛋白质和多糖等物质,最低SCFAs积累量为4322.61 mg COD·L^(-1)。同时发现,3个发酵系统中挥发性短链脂肪酸酸成分具有显著差别,其中自然型发酵系统乙酸积累率最大,可达69.70%,中性发酵系统丙酸积累率最大可达49.27%,填料型发酵系统正丁酸积累率最大可达38.85%。To investigate the effects of an anaerobic fermentation method on milk-residue wastewater acidogenic- ity,natural, beaumontage, and mediosilicic fermentation （ pH = 7.0 ± 0.2） were used with two operation cycles continuously. Different chemical and biological indicators, such as soluble chemical oxygen demand, protein, pol- ysaccharides,short-chain fatty acids （ SCFAs）, hydrolase （ protease, α-glycosides enzyme）, coenzyme F420, NH4＋ -N,and pO34-P,were analyzed in the anaerobic fermentation process. The mediosilicic fermentation system had high bydrolase activity,which led to higher hydrolysis rates of protein and polysaccharides. This caused high- er acidogenicity performance,and the maximum SCFA accumulation was 12 328.37 mg COD · L^-1. However, the natural fermentation system had lower hydrolase activity, and large amounts of protein and polysaccharides were left,which led to lower SCFA production;the minimum value was 4 322.61 mg COD· L^-1 Individual SC- FAs showed significant differences between the three fermentation systems,where the maximum accumulation rate of acetic acid was 69.70% in the natural fermentation system,that of propionic acid was 49.27% in the mediosi- licic fermentation system,and that of butyric acid was 38.85% in the beaumontage fermentation system.

关 键 词：乳渣废水 厌氧发酵 水解酸化 运行方式 可挥发性脂肪酸 水解酶 

分 类 号：X703[环境科学与工程—环境工程]