红斑顠体虫的污泥减量效果

为了实现红斑顠体虫捕食污泥减量化,对不同条件下红斑顠体虫的污泥减量效果进行实验研究。实验结果表明：红斑顠体虫的污泥减量速率随初始MLSS及温度的增大而增大,初始MLSS越高,污泥减量速率越大。污泥减量速率随红斑顠体虫密度变化率的增大而逐渐增大,当红斑顠体虫的密度增长率出现下降时,污泥减量速率也呈下降趋势。采用间歇曝气（12 h曝气,12 h停曝）方式,红斑顠体虫的污泥减量速率会显著下降。在污泥好氧消化时,红斑顠体虫能捕食污泥中的有机碎片和细菌,达到污泥稳定化的指标要求。     

绿磺隆在土壤中的残留与危害

江苏省苏南地区，冬季麦田每公顷施用１５ｇ绿磺隆（以有效成份计，下同），翌年水稻栽秧时土壤中绿磺隆的残留量为０．２２μｇ／ｋｇ，种麦期间绿磺隆在土壤中的降解量约占施用量的９６．８％，绿磺隆在土壤中的降解半衰期平均为３８．６ｄ。水稻对绿磺隆也有高度的敏感性，由于绿磺隆在渍水土镶中容易降解，所以它在稻麦轮作地区对后茬水稻的实际危害较轻。改善土壤肥力状况，在一定程度上可减缓绿磺隆对作物的危害。     

Shifted power-law relationship between NO2 concentration and the distance from a highway: A new dispersion model based on the wind profile model

In this paper, a shifted power-law model, based on the wind profile model, had been supposed to simulate concentration gradient of nitrogen dioxide (NO₂) with distance from a highway. Field experiments were performed for NO₂ gradients from a highway in Shanghai by using passive samplers. The shifted power-law model was fitted well with experimental results of field experiments both in this study and in the literature. The results not only verified the validity of shifted power-law relationship between NO₂ concentration and the distance from a highway, but also partially demonstrated that there were some significant similarities between wind profile and air pollutants concentration profile near highway. With known concentration of chosen reference point and appropriate value of the parameter k, the model could be practically applied for predicting the NO₂ distributions near a highway. The methods of determining the parameter k were also discussed for further detailed studies.     

混凝-折流式反应器对垃圾渗滤液处理的试验研究

采用混凝、三组水解池和好氧生物滤池串连组成的折流式反应器(BR)联合工艺,对处理芜湖市南郊垃圾填埋场产生的渗滤液进行了试验研究,确定了混凝剂的最佳投加量、最佳碱化脱氮pH等工艺参数.试验结果表明,经过水解反应器(HUSB)反复对垃圾渗滤液进行水解酸化后,能逐步提高废水的BOD5/COD(B/C)(约0.2～0.4),大大提高了好氧生物滤池的COD容积负荷,出水COD平均《400 mg/L,NH3-N平均《30 mg/L.     

二氧化氯销毁氰化物的应用研究

在弱碱性条件下，二氧化氯消毒剂将氰化物氧化成无毒的氰酸盐（OCN）、二氧化碳和氮气。研究了影响二氧化氯销毁氰化物的几种因素：pH在8—11的范围内，不影响二氧化氯对氰化物的销毁率；在所试验的反应温度（0-40℃）内，温度对反应速率表现出有限的影响；二氧化氯与氰离子的最佳质量比为2：1；当氰离子最高使用浓度小于0．5g／L时，废水中氰离子浓度达一级以上的排放标准。     

武钢焦化公司酚氰废水治理现状及改进措施

本文介绍了武钢焦化公司酚氰废水的来源、治理的原理、工艺流程及运行现状 ,并对一些环节提出了具体的改进措施和建议。     

Streptomyces sp. WJS-825产谷氨酰胺转胺酶发酵条件优化及中试

应用五因子二次正交旋转回归试验设计,建立了微生物谷氨酰胺转胺酶 (TG)发酵生产过程中以酶活力和菌体细胞生长量作为目标函数的数学模型,并以此模型对链霉菌 (Streptomycessp. )WJS-825菌株发酵生产TG的培养条件进行优化,确定了影响TG生产的主要因子及其最适取值为多价胨 2. 1%、可溶性淀粉 1. 5%、初始pH 7. 0及培养温度 30℃.以该优化工艺条件进行了 5L发酵罐小试和 200L发酵规模的中试生产.结果表明,在中试发酵生产中使用以豆饼粉部分替代多价胨的经济性发酵优化培养基,以及发酵过程中在线监控pH、溶氧系数等多项发酵调控参数,并分段控制pH、温度、通气量和搅拌转速以及进行适时的流加补充碳源,该菌株生长繁殖能力强、产酶效果好,TG活性达 3. 2u/mL,而且连续重复的中试发酵生产试验的TG产量均稳定在 3. 2u/mL以上. 图 2表 3参 15     

土壤中酞酸酯的分析方法研究

经过系统研究,建立了以正已烷/丙酮(V/V:2/1)为溶剂,对土壤进行超声萃取,然后以浓H_2SO_4进行纯化的分析土壤中酞酸酯的方法。本方法具有省时、省溶剂、空白低及纯化效果好的特点,具有很强的实用性。     

Understanding the risks of mercury sulfide nanoparticles in the environment: Formation, presence, and environmental behaviors

Mercury (Hg) could be microbially methylated to the bioaccumulative neurotoxin methylmercury (MeHg), raising health concerns. Understanding the methylation of various Hg species is thus critical in predicting the MeHg risk. Among the known Hg species, mercury sulfide (HgS) is the largest Hg reservoir in the lithosphere and has long been considered to be highly inert. However, with advances in the analytical methods of nanoparticles, HgS nanoparticles (HgS NPs) have recently been detected in various environmental matrices or organisms. Furthermore, pioneering laboratory studies have reported the high bioavailability of HgS NPs. The formation, presence, and transformation (e.g., methylation) of HgS NPs are intricately related to several environmental factors, especially dissolved organic matter (DOM). The complexity of the behavior of HgS NPs and the heterogeneity of DOM prevent us from comprehensively understanding and predicting the risk of HgS NPs. To reveal the role of HgS NPs in Hg biogeochemical cycling, research needs should focus on the following aspects: the formation pathways, the presence, and the environmental behaviors of HgS NPs impacted by the dominant influential factor of DOM. We thus summarized the latest progress in these aspects and proposed future research priorities, e.g., developing the detection techniques of HgS NPs and probing HgS NPs in various matrices, further exploring the interactions between DOM and HgS NPs. Besides, as most of the previous studies were conducted in laboratories, our current knowledge should be further refreshed through field observations, which would help to gain better insights into predicting the Hg risks in natural environment.     

覆膜滤料对特殊烟尘处理的优越性

覆膜滤料是新型的过滤材料 ,弥补了普通滤料在烟尘处理过程中的不足。特别是对含油雾、粘结性强的粉尘以及高湿等特殊烟尘治理具有良好的效果