Total nitrogen and community turnover determine phosphorus use efficiency of phytoplankton along nutrient gradients in plateau lakes

Numerous studies support that biodiversity predict most to ecosystem functioning, but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied. We investigated 398 samples of the phytoplankton phosphorus resource use efficiency (RUE_P = chlorophyll-a concentration/dissolved phosphate) across two seasons in nine plateau lakes in Yunnan Province, China. We identified the main contributors to phytoplankton RUE_P and analyzed their potential influences on RUE_P at different lake trophic states. The results showed that total nitrogen (TN) contributed the most to RUE_P among the nine lakes, whereas community turnover (measured as community dissimilarity) explained the most to RUE_P variation across the two seasons. Moreover, TN also influenced RUE_P by affecting biodiversity. Species richness (SR), functional attribute diversity (FAD2), and dendrogram-based functional diversity (FDc) were positively correlated with RUE_P in both seasons, while evenness was negatively correlated with RUE_P at the end of the rainy season. We also found that the effects of biodiversity and turnover on RUE_P depended on the lake trophic states. SR and FAD2 were positively correlated with RUE_P in all three trophic states. Evenness showed a negative correlation with RUE_P at the eutrophic and oligotrophic levels, but a positive correlation at the mesotrophic level. Turnover had a negative influence on RUE_P at the eutrophic level, but a positive influence at the mesotrophic and oligotrophic levels. Overall, our results suggested that multiple factors and nutrient states need to be considered when the ecosystem functioning predictors and the biodiversity-ecosystem functioning relationships are investigated.     

活性硅酸聚合硫酸铁的研究

以硅酸钠，硫酸和聚合硫酸铁为原料制备活性硅酸合硫酸铁，测定了ＡＳＰＦＳ红外光谱，了Ｆｅ／Ｓｉ摩尔比和水样ＰＨ值等因素对产品和除浊效果的影响当Ｆｅ／Ｓｉ摩尔比为１．５时产品稳定性和除浊效果均较好。     

清洁的胡椒基T醚生产工艺的研究I,5-丙基-1,3-苯并二氧杂茂的氯甲基化废水的处理

报道了胡椒基丁醚生产中５－丙基－１，３－苯并二氧杂茂的氯甲基化的废水处理，该废水经蒸馏可回收９４％的盐酸，此酸吸收氯化氢后浓度在３６％以上，可再用于氯甲基化反应。蒸馏残液经分油、Ｆｅｎｔｏｎ试剂处理和五次生炭柱吸附后ＣＯＤＣｒ等项指标均可国家二类污染物的一级排放标准。     

旋流雾化水雾膜提高文丘里水膜除尘效率的实验研究

应用低压旋流雾化水喷嘴 (不同运行压力和组合方式 )实验研究了旋流雾化水雾膜对除尘效率的影响。研究结果表明 :喉部喷嘴布置及运行情况直接影响喉部水雾均匀度和除尘效率 ;采用两两相向的低压旋流雾化水喷嘴组合布置 ,保证喷嘴入口水压力为 0 2～ 0 4MPa ,液气比为 0 1～ 0 2L/m3 时 ,除尘效率将大大提高 ,且有节水节能和脱硫效果。     

糖厂废醪液蔗地施肥的效应

糖厂根据当地的自然条件和工农关系 ,采用施肥法资源化利用废醪液 ,是最为经济的污水治理方法。     

连杆多工步弯曲模设计

介绍了一种原理和结构都较新颖的连杆弯曲模的设计方法和使用特点.     

射流曝气SBR技术在屠宰废水治理中的应用

介绍了应用射流曝气和序列间歇式活性污泥（ＳＢＲ）治理屠宰废水的工程实例。半年多的运行情况表明，该系统具有很好操作性和稳定性，当系统污水排放量或有机负荷发生较大波动时，有较好的缓冲适应能力，并能保证整个系统稳定达标。     

铝、铁共聚作用的化学特征及晶貌研究

通过对铝，铁水解共聚物的合成制备及其水解共聚合过程电位滴定的研究，并通过扫描电镜对其共聚物样品的晶貌观测，ｎＡｌ／ｎＦｅ的点能谱及结构组成的红外光谱测定，对铝铁共聚作用的化学特征及其晶形貌象，共聚作用进行了研究及讨论，为深入研究铝无机共聚溶液体系化学形态组成及其絮凝剂的提供了的基础实验依据。     

表面过滤技术及其在袋式除尘器上的应用

本文介绍了一种新型的过滤技术(表面过滤技术)在袋式除尘器中的应用及其特点,该技术的采用可减少除尘器的压力损失,提高滤袋的使用寿命和除尘效率.     

综合治理太湖刻不容缓

太湖水资源状况与和长江三角洲的经济发展关系极大。多年来，人为对太湖资源的破坏使本来就很脆弱的生态环境不堪重负。应尽快建立有权威的管理机构，制定高起点，高标准，高科技，高效益的综合开发治理总体规则，使太湖明珠重放光彩。