缺氧－好氧生物膜法脱氮技术的研究

为了防止氮污染对水体造成的危害,我国对氨氮排放实行严格的控制。采用缺氧－好氧淹没式生物膜脱氮方法研究其处理效果与工艺参数,并着重研究氮负荷和碳源对硝化、反硝化的影响;微生物在膜上的分布特性及其对底质变化的影响。研究结果表明：缺氧段（A段）停留时间为7.3h,好氧段（0段）为15.7h好氧段容积负荷：COD0.36kg/m³·d,NH₃－N0.35kg/m³·d;缺氧段硝态氮负荷0.65kg/m³·d,COD负荷1.7kg/m³·d。这一水处理技术工艺稳定,NH₃－N与NO_x－N的去除率均在90％以上,而且生物活性强,分布较均匀,是目前控制氮污染的有效方法。     

生物膜反应器进出水底物浓度相关性研究

从套氧生物膜反器,异养－好氧生物膜反应器和硝化生物膜反应器三方面,全面考察了进水底物浓度对生物膜反应器稳态出水水质的影响委现Ｓｅ随Ｓ０的变化呈现半Ｕ形曲线。在传统的线性模型基础上,提出了非线性Ｓｅ－Ｓ０的模型,该模型能很好地定量描述试验所得数据,并从的数据得到进一步的验证。     

空气提升内循环生物流化床反应器动力学研究

进行了空气提升内循环生物流化床反应液体内循环速度,有机的降解动力学,载体表面生物膜脱落与增工动力学的研究,结果表明,内循环生物硫化内不速度分别与反应器高度及升流区表观气速ｕｇ０．５次方成正比,当内循环流量很大时,反应器可视为ＣＳＴＲ;生物膜的脱降率分别与ｕｇ及膜厚δ的次方,载体数量的２／３次方成正比。     

废水处理用生物填料的研究进展

概述了废 (污 )水处理用生物填料的现状和发展 ,并针对现今水处理用生物填料存在的亲水性和生物亲和性(活性 )不足这一问题 ,提出了解决办法和发展方向 ,指出生物亲和亲水活性磁种填料的应用 ,可望大大提高废水生物降解的效率。     

不同填料负载微生物去除地表水氨氮的研究

氨氮浓度过高是黑臭水体难以治理的重要原因之一.本研究比较了经活性污泥驯化的菌株与市售硝化菌液两种不同菌剂分别在有机填料聚丙烯纤维和无机填料沸石上的挂膜特性,考察了不同挂膜填料性质、填料粒径、源水pH值等因素对氨氮去除效果的影响,并通过高通量测序解构不同填料生物膜的微生物群落差异,探究填料负载微生物的生物膜法去除氨氮的综...     

信号分子强化改性挂膜沸石持续抑制沉积物中氨氮释放

为寻找一种长期有效的底泥修复方式,对沸石进行了改性并挂膜的实验.考察了 4种铝盐[AlCl3、Al(NO3)3、Al2(SO4)3和KAl(SO4)2]改性挂膜沸石对上覆水中氨氮的去除情况.结果表明,AlCl3改性挂膜沸石效果最佳,且最佳改性浓度为0.8 mol·L-1.进一步分析添加信号分子OHHL后,AlCl3改性...     

Biofilm mediated degradation of commercially available LDPE films by bacterial strains isolated from partially degraded plastic

Biodegradation is an attractive approach for the elimination of synthetic polymers, pervasively accumulated in natural environments and generating ecological problems. The present work investigated the degradation of low‐density polyethylene (PE) by three Bacillus sp., that is, ISJ36, ISJ38, and ISJ40. The degree of biodegradation was assessed by measuring hydrophobicity, viability, and total protein content of bacterial biofilm attached to the PE surface. Although all three bacterial strains were able to establish an active biofilm community on the PE surface, ISJ40 showed better affinity toward PE degradation than the other two. Bacterial colonization and physical changes on the PE surface were visualized by scanning electron microscopy. Fourier transform infrared spectroscopy analysis revealed alteration in the intensities of functional groups along with an increase in the carbonyl bond indexes. The study results suggest that the Bacillus strain ISJ40 can be used as a potential degrader for the eco‐friendly treatment of PE waste.     

Pesticides impact on Clavibacter michiganensis ssp. sepedonicus biofilm formation

The effect of various pesticides on the biofilm formation by the phytopathogenic bacterium Clavibacter michiganensis ssp. sepedonicus (Cms), the potato ring rot causative agent, was explored for the first time. Systemic herbicides: 2,4-D, diuron, glyphosate, clopyralid, fluorodifen, as well as the commercial preparations “Lazurite,” “Ridomil Gold,” and the mitochondria inhibiting pesticides analog, sodium monoiodoacetate, were studied. These pesticides' effect on the Cms biofilm formation was shown to be distinct and dependent on the agent under question. Cms biofilm formation was reduced when exposed to sodium monoiodoacetate, as well as “Lazurite” preparation, that could be due to the bactericidal effect of these agents. 2,4-D and “Ridomil Gold” preparation stimulated the biofilm formation. Systemic herbicides diuron, glyphosate, clopyralid, fluorodifen did not exert appreciable influence on the process of bacterial biofilm formation.     

A novel approach to treat combined domestic wastewater and excess sludge in MBR

Domestic wastewater was treated by combined anaerobic biofilm-aerobic membrane bioreactor(MBR) process, and part biomass in MBR was withdrawn, to treat with ozone, then the ozonated sludge was returned to anaerobic inlet. In aerobic MBR, MLSS and DO were controlled at 3000—3500 mg/L and 0.8 mg/L respectively. Comparing the experimental results of two stages, it was noticed that ozonation did not affect the removal efficiency for organics but had a significant influence on the removals of NHs-N and TN. During the ozonation period of two months, no excess sludge was wasted, and a zero sludge yield was obtained.     

渠式生物膜反应器处理生活污水的动力学研究

文章对渠式生物膜反应器系统的动力学过程进行了探讨,在Monod方程的基础上提出了去除有机物的动力学方程。根据方程和对生活污水处理实验结果,得出了在20～30℃时降解生活污水的动力学方程为S=S0e0.0441qL-0.1993L,为渠式生物膜反应器系统的设计和运行提供了理论依据。