空调系统冷冻水循环水泵变频运行的变温差控制

在分析空调系统变流量运行调节的基础上,提出了变温差控制并给出了控制方案。变温差控制过程不仅具有负反馈,而且具有正反馈,能较好的适应空调负荷的变化。比较分析了变温差控制、定温差控制、定压差控制的节能性,变温差控制的节能潜力最大,是一种最佳控制方式。     

Impacts of wastewater sludge amendments in restoring nitrogen cycle in p-nitrophenol contaminated soil

The possible impacts on nitrogen-cycle in a p-nitrophenol (PNP) polluted soil and the e ectiveness of wastewater sludge amendments in restoring nitrification potential and urease activity were evaluated by an incubation study. The results indicated that PNP at 250 mg/kg soil inhibited urease activity, nitrification potential, arginine ammonification rate and heterotrophic bacteria counts to some extents. After exposure to PNP, the nitrification potential of the tested soil was dramatically reduced to zero over a period of 30 days. Based on the findings, nitrification potential was postulated as a simple biochemical indicator for PNP pollution in soils. Nitrogen-cycling processes in soils responded positively to the applications of wastewater sludges. A sludge application rate of 200 tons/ha was su cient for successful biostimulation of these nitrogen processes. The microbial activities in sludge-amended, heavy PNP-polluted soils seemed to recover after 30–45 days, indicating the e ectiveness of sludge as a useful soil amendment.     

Nitrogen cycle of a typical Suaeda salsa marsh ecosystem in the Yellow River estuary

The nitrogen (N) biological cycle of the Suaeda salsa marsh ecosystem in the Yellow River estuary was studied during 2008 to 2009. Results showed that soil N had significant seasonal fluctuations and vertical distribution. The N/P ratio (15.73±1.77) of S. salsa was less than 16, indicating that plant growth was limited by both N and P. The N absorption coefficient of S. salsa was very low (0.007), while the N utilization and cycle coefficients were high (0.824 and 0.331, respectively). The N turnover among compartments of S. salsa marsh showed that N uptake from aboveground parts and roots were 2.539 and 0.622 g/m2, respectively. The N translocation from aboveground parts to roots and from roots to soil were 2.042 and 0.076 g/m2, respectively. The N translocation from aboveground living bodies to litter was 0.497 g/m2, the annual N return from litter to soil was far less than 0.368 g/m2, and the net N mineralization in topsoil during the growing season was 0.033 g/m2. N was an important limiting factor in S. salsa marsh, and the ecosystem was classified as unstable and vulnerable. S. salsa was seemingly well adapted to the low-nutrient status and vulnerable habitat, and the nutrient enrichment due to N import from the Yellow River estuary would be a potential threat to the S. salsa marsh. Excessive nutrient loading might favor invasive species and induce severe long-term degradation of the ecosystem if human intervention measures were not taken. The N quantitative relationships determined in our study might provide a scientific basis for the establishment of effective measures.     

为了下一代——索尼(中国)企业社会责任报告2010(环境部分)

概况随着全球经济一体化的推进和全球气候变暖趋势逐渐明显,索尼(中国)在履行社会责任、实施可持续发展过程中,在生态环境保护、社区和谐稳定、消费者及其他利益相关群体权益保护等诸多方面不断强化并完善各项举措,收到了良好的效果。索尼集团于2010年4月提出"环境零负荷"的目标,即计划到2050年,在企业运营行为和产品使用周期中,将对环境的负荷降低至零。作为集团中的一员,索尼(中国)在致力于为人们提供更多新颖、时尚的高科技产品同时,也在对产品研     

你对塑料了解多少?

吃、穿、住、行、用,塑料制品的身影无处不在,但是对司空见惯、貌似平常的塑料你到底了解多少?1、塑料会在以下哪类物品中出现?衣服地毯食物以上各种答案:以上各种。无论是用来制作衣服和地毯的化纤,还是染色的油墨,甚至我们扔掉的塑料,最终还是可能会返回到食物链中,塑料无处不在。然而,尽管循环利用非常重要,各种地毯回     

水泥企业物质流分析

物质流分析（Material Flow Analysis,MFA）在循环经济建设和可持续发展方面研究迅速,相对国家与区域层次,企业MFA研究成果甚少且分析思路不同。本文选取海南省某水泥企业为研究对象,从企业层次对整个熟料和水泥生产过程中的物质输入与输出进行核算,并结合水泥工业清洁生产标准部分指标对计算结果进行评定。最后针对分析结果,对水泥生产特别是资源投入与污染排放方面提出相关改进措施与建议。     

地方传真

内蒙古出台阶梯水价等政策促进节约用水 今年以来,内蒙古实施了阶梯水价等一系列政策,以增强公众的节水意识。按照新出台的规定,内蒙古将对取用再生水、矿井疏干水的用户免征水资源费,以促进水资源循环利用。与此同时,内蒙古对用水量超过定额的用户则实行累进加价制度。此外,在城镇公共供水管网覆盖范围内取用地下水的单位和个人,必须将自备水源转换为公共供水管网水源。     

COD/SO42-对硫酸盐有机废水处理效率的影响

以人工配制的含硫酸盐有机废水作为原水,研究不同COD/SO42-值下厌氧折流板反应器(ABR)处理含硫酸盐有机废水去除率.试验结果表明:当COD/SO42-＜14.8时COD的去除率可达95%,SO42-的去除率在86%～96%之间;当COD/SO42-在14.8～4.0之间时,COD的去除率有所下降但仍能保持在94%...     

臭氧处理循环冷却水节能减排效益分析

文章基于臭氧(O3)处理法处理循环冷却水因可以同时达到阻垢脱垢、缓蚀、杀菌等多重功能,其在国外已得到广泛应用,同时国内也逐步普及应用的环境下,结合国内外长期的工程实践经验,从节水、节能、减排和公共卫生效益四个方面,详细分析了臭氧处理循环冷却水所带来的巨大经济效益、社会效益和环境效益。     

循环流化床脱硫技术在烧结烟气净化中的应用

依据钢铁厂烧结烟气的特点,介绍了循环流化床脱硫除尘技术的工艺处理系统原理、具体系统组成和该工艺的先进性,并结合了河北省某钢铁厂2台105 m2烧结机烟气脱硫除尘项目具体的设计、施工和安装调试,分析循环流化床脱硫除尘技术的脱硫除尘技术指标和经济指标.分析结果表明:循环流化床脱硫技术具有脱硫除尘效率高、工艺投资省、运行费用低等优点,是一种值得在烧结烟气脱硫中推广应用的脱硫技术.