STUDY OF COORDINATED PRETREATMENT OF XYLANASE AND LACCASE ON SODA-AQ WHEAT STRAW PULP BEFORE CEH BLEACHING

INTRODUCTIONXylanase pretreatment can produce many small holes on pulp surfaces and cross section by removing part xylose that may be sucked back or exists in style of LCC. Thus penetrability of following chemicals. Olsen [1] observed coordinated pretreatment of xylanase and lignin enzyme (compound of lignin peroxide enzyme and manganese peroxide enzyme) had better delignification than sole xylanase and sole laccase lignin enzyme. So we can forecast that coordinated pretreatment of xylan…     

中途集水对沉淀池的影响分析

为了防止出水堰负荷过高影响出水水质,沉淀池中常增加出水堰的长度.基于Camp式理想沉淀池相关理论,分析增设出水堰时沉淀池的工作情况.认为适当增加沿途集水可以提高沉淀池的水力负荷.为了保证水力负荷增大时的处理效率,可以采用强化措施.经过初步的经济分析,认为通过中途集水实现初次沉淀池挖潜是可行的.     

亚麻织物漂染中的酶洗除氧技术

研究了亚麻织物漂染工艺中过氧化氢酶的除氧效果及同浴染色效果,用正交试验法优选了过氧化氢酶的最佳除氧工艺:酶用量4.5ml/L,pH=7,35℃酶洗25min。结果表明,与传统的高温水洗除氧工艺相比,酶洗除氧工艺可以保证各项染色性能,并节约能源,提高生产效率,降低生产成本。     

不同潜流湿地去除污水中磷素的反应动力学

采用不同潜流型人工湿地对污水处理厂二级出水进行深度处理研究,分析其对磷素去除效果及其反应动力学模型。结果表明,在选取相同水力负荷条件下,与垂直潜流湿地相比,水平潜流湿地对污水中的磷素的去除表现出了较好的去除趋势;而与水平-沸石湿地相比,水平-石灰石湿地则表现出了对磷素更佳的去除效果,其去除率则基本稳定在663．±33．2％～920．±48．2％。另外,根据反应动力学模拟分析可知,四种潜流湿地符合一级反应动力学方程特点,即其对磷素的去除过程基本可以认为只进行到一级反应。     

Photochemical alteration of biogenic particles in wastewater effluents

Biogenic particles discharged by wastewater treatment plants play important roles in receiving water because of the large specific surface area and good mobility of the particles. In this study, the changes induced in biogenic particles by natural sunlight were investigated to understand the phototransformation of the particles in the receiving waters. The results showed that photoexposure resulted in significant decreases in the sizes of the biogenic particles but that photoexposure did not impact the zeta potentials. In addition, the photodissolution of biogenic particulate organic matter(POM) led to the generation of biogenic dissolved organic matter(DOM). Characterization using excitation–emission matrix(EEM) spectroscopy showed that photoexposure changed both the shapes and the intensities of the EEM spectra of the biogenic POM; the regions of the T1 and T2 peaks were susceptible to photoexposure. Modeling by parallel factor analysis(PARAFAC) decomposed the EEMs of the biogenic POM into four valid components, i.e., terrestrial or microbial humic-like substances, tryptophan-like proteins, tyrosinelike proteins and hydrophobic proteins. The humic-like substances in the biogenic POM from the effluents were subject to lower decreases(17.0 % and 11.6 %).Throughout the entire incubation time, the PARAFAC components in the biogenic DOM were dominated by elimination mechanisms rather than by production through photodissolution of the biogenic POM.     

多相光催化氧化法处理焦化废水的研究

以TiO2为催化剂,H2O2为氧化剂,在紫外光照射下采用多相光催化氧化法对焦化废水进行处理,对COD去除率的各种影响因素进行了研究探讨,从而得出其较佳工艺条件．结果表明该法可使焦化厂二沉池废水COD从348．3mg／L降至52．1mg／L,COD的去除率可达85．0％以上。     

烹饪炸油吸附剂的研究

对几种吸附效果较好的吸附剂进行研究,通过它们对油脂吸附效果的比较,最终选择活性白土作为一种使用简便、价廉而高效油脂再生剂,并进一步对活性白土的活化工艺进行了探讨.     

一体式膜生物反应器处理城市生活污水水质及回用分析

城市缺水问题日益突出,城市生活污水作为第二水源回用极为迫切.分析了膜生物反应器处理城市污水出水水质及其回用情况.实验中试表明,膜生物反应器处理城市生活污水,系统运行稳定,出水水质优于中国建设部部标生活杂用水水质标准(CJ25.1-89),可直接用于城市绿化、冲厕、扫除及洗车.具有良好的环境、经济和社会效益.     

过渡金属离子对废纸浆H2O2漂白的影响

研究了过渡金属离子对废纸浆H2O2漂白的影响.研究结果表明,经较强的螯合处理之后重新加Cu2 ,Fe2 和Mn2 ,漂后纸浆的白度降低,残余H2O2减少,漂白效率降低.     

新型专用彩漂液洗剂的研制

概述了彩漂液洗剂的漂白原理,通过对彩漂液洗剂的配方研究及性能测试等一系列相关实验,探讨了稳定剂、溶液的pH值、表面活性剂等对彩漂液洗剂稳定性的影响,并经实验证明彩漂液的漂白效果比一般洗衣粉的漂白效果要好.