生化需氧量计算方法的探讨

生化需氧量标准分析方法中的计算公式在实际工作中计算起来比较复杂,工作量较大.根据多年工作经验,在标准分析方法计算公式的基础上,经过理论推导,得出一个新公式,只需记录水样稀释倍数,使记录、计算变得简便、明了、快速、精确,更具有实用价值.     

浙江温州北部地区白垩系地层划分与对比

本文根据温州北部地区的火山-沉积岩地层的剖面,进行了岩石地层、生物地层、年代地层的综合研究和区域对比,针对以往1: 25万、1: 20万和1: 5万区域地质调查的划分和归属提出了新的看法.浙东南下白垩统火山-沉积岩分为上、下两个岩系,下岩系称磨石山群,上岩系称永康群.研究认为,温州北部地区的火山-沉积岩系主体为下白垩统下岩系的磨石山群,并非均为上岩系的永康群馆头组;在永嘉枫林、澄田一带的火山-沉积岩地层分别属于磨石山群大爽组和茶湾组,而桥下一带的沉积岩地层则属于永康群馆头组.     

修井作业的变更管理

通过对修井施工中不同压井液的选择及其使用风险和低压气井修井作业中风险的识别进行分析,指出修井作业HSE管理体系变更管理的重要性。     

花桥典型地块景观格局及植被群落结构指数评价与制图研究

自然过程是规划过程的重要维度。与中国法定规划体系相衔接的生态单元分类、评价系统的构建,是生态研究与城乡规划之间的一座桥梁。选取昆山花桥为研究对象,以2010年Landsat遥感数据TM影像图为主要数据源。在城乡生态单元制图的基础上,从区域景观格局的宏观角度分析城市化、乡村以及城乡交错带三类典型地块的生态用地特征。研究表明:城市水体形态过于笔直、公园绿地分布过于集中,城乡交错带水体破碎化严重、人工景观呈集聚状的发展趋势,乡村地块水体受农业活动影响严重、农田景观应重点保护等。进而从微观角度进行植被群落结构指数评价,作为生态信息的重要补充。根据植被指数图谱可得花溪公园附近的植被群落结构指数较高,河道两侧的线性连续性整体尚佳,植被群落结构丰富,而道路两侧的植被较为单一等。旨在提供一种城市生态评价体系,从宏观到微观,从生态格局分析到植被群落结构评价,希望能更清晰的反映不同区域之间的生态价值差异,为城乡绿地系统规划提供生态基础性数据。     

An improved biofilter to control the dissolved organic nitrogen concentration during drinking water treatment

Environmental Science and Pollution Research - Dissolved organic nitrogen (DON) is a key precursor of numerous disinfection by-products (DBPs), especially nitrogenous DBPs (N-DBPs) formed during...     

The effects of grassland degradation on plant diversity,primary productivity,and soil fertility in the alpine region of Asia’s headwaters

A 3-year survey was conducted to explore the relationships among plant composition, productivity, and soil fertility characterizing four different degradation stages of an alpine meadow in the source region of the Yangtze and Yellow Rivers, China. Results showed that plant species diversity, productivity, and soil fertility of the top 30-cm soil layer significantly declined with degradation stages of alpine meadow over the study period. The productivity of forbs significantly increased with degradation stages, and the soil potassium stock was not affected by grassland degradation. The vegetation composition gradually shifted from perennial graminoids (grasses and sedges) to annual forbs along the degradation gradient. The abrupt change of response in plant diversity, plant productivity, and soil nutrients was demonstrated after heavy grassland degradation. Moreover, degradation can indicate plant species diversity and productivity through changing soil fertility. However, the clear relationships are difficult to establish. In conclusion, degradation influenced ecosystem function and services, such as plant species diversity, productivity, and soil carbon and nitrogen stocks. Additionally, both plant species diversity and soil nutrients were important predictors in different degradation stages of alpine meadows. To this end, heavy degradation grade was shown to cause shift of plant community in alpine meadow, which provided an important basis for sustaining ecosystem function, manipulating the vegetation composition of the area and restoring the degraded alpine grassland.     

无缝钢管厂外排废水治理方案

针对无缝钢管厂酸洗废水pH值低、氧化铁含量高等特殊性，采用分散治理回收与集中处理回收相结合的技术方案。使处理后的水回用于生产，并采用一水多用、重复利用和循环利用的技术，提高了重复用水率，基本上实现“零排放”。     

Mass flows and removal of antibiotics in two municipal wastewater treatment plants

The mass flows and removal of 20 antibiotics of seven classes in two wastewater treatment plants (WWTPs) of Hong Kong were investigated in different seasons of a whole year, using bihourly 24 h flow proportional composite samples. Antibiotics were detected at concentrations of 3.2-1718, 1.3-1176 and 1.1-233 ng L⁻¹ in influents, secondary and disinfection effluents. Total daily discharges of all the detected antibiotics from effluents of Shatin and Stanley WWTPs were 470-710 and 3.0-5.2 g d⁻¹, respectively. Ampicillin, cefalexin, sulfamethoxazole, sulfadiazine, sulfamethazine, chlortetracycline and vancomycin were effectively (52-100%) eliminated by activated sludge process while ampicillin and cefalexin were effectively (91-99%) eliminated by disinfection. Bihourly variation analysis showed that concentrations of the major antibiotics in influents varied more significantly in Stanley WWTP which served small communities.     

厌氧消化1号模型(ADMl)的发展及其应用

国际水协(IWA)于2002年正式推出了厌氧消化1号模型(ADM1),其主要目的是建立一个厌氧工艺建模和模拟的通用平台,促进厌氧处理工艺技术的发展.近年来,ADMI在许多方面得到扩展,如包含硫酸盐还原、硝酸盐还原、产气及其释放的扩展等,这使ADM1更趋于完善.ADM1与其他污水处理数学模型结合的应用以及在分布参数模型中的应用是当前该模型应用的主要方面.有机物发酵的复杂性以及数量众多的模型动力学参数和组分都极人限制了该模型的广泛应用.     

Does the GreenWatch program work? Evidence from a developed area in China

The GreenWatch program has been implemented nationally in China. However, whether the program and its process have been effective in improving firms' environmental performance remains unclear. Based on the stakeholder theory, this paper conducts a comparative analysis between firms participating in the program and those that do not, all of which are based in Changshu City in the developed part of Jiangsu Province, China. Data suggest that GreenWatch encourages firms to improve and disclose their environmental performance. Through pressures imposed by different stakeholders—from the government, investors, and consumers, to the public, such as the community and media—this program has become the main driving force for improving the firms' environmental performance. The current study also provides substantial evidence that public disclosure in China opens up channels for effective public participation. Therefore, the GreenWatch program deserves to be promoted in China.