The influence of carbon emission disclosure on enterprise value under ownership heterogeneity: evidence from the heavily polluting corporations

Environmental Science and Pollution Research - Under the background that China puts forth the goals of “Emission Peak” and “Carbon Neutrality”, heavily polluting...     

Temporal dynamics of microcystins in two reservoirs with different trophic status during the early growth stage of cyanobacteria

Environmental Science and Pollution Research - Harmful cyanobacterial blooms are increasing in frequency and severity, which makes their toxic secondary metabolites of microcystins (MCs) have been...     

Structural regulation of electroplating sludge by a metal–organic framework synthesis method for an enhanced denitrification activity

Journal of Material Cycles and Waste Management - Electroplating sludge contained multi-metals and organics. In previous reports, electroplating sludges were usually recycled by direct calcination...     

金属矿山采选项目的环境管理制度执行情况及问题分析

介绍了金属矿山项目的一般环境影响及特殊环境影响,通过识别金属矿山的特殊环境影响,以金属矿山尾矿库溃坝事故为例,对金属矿山项目环境管理制度执行情况及在管理过程中存在的问题进行了分析。尽管在矿山开采建设及服务过程都伴随着环境制度的监管,但是在实际运行过程中仍会出现不同的问题,产生环境污染影响与生态影响。因此,识别出金属矿山项目采选易发生的环境问题,在开发矿产资源的同时做好矿山环境保护及管理工作、加强矿山环境制度建设及环境监管是非常必要的。     

Eutrophication conditions and ecological status in typical bays of Lake Taihu in China

Sampling was conducted at three site groups, group E (in East Taihu Bay), G (in Gonghu Bay) and M (in Meiliang Bay) in Lake Taihu. TN and TP concentrations among site groups was in the increasing order of E < G < M. TP level at G sites is at the critical threshold for loss of submersed macrophytes. Mean values of DO and Transparence showed different trend, i.e., E > G > M. The mean phytoplankton fresh-weight biomass at M sites was 5.81 mg/l, higher than that at E sites (4.96 mg/l) and G sites (5.18 mg/l). Mean zooplankton fresh-weight biomass was in the decreasing order of M (6.4 mg/l) > G (4.9 mg/l) > E (2.7 mg/l). However, Rotifera density was in the sequence of E > G > M. Both zooplankton biomass and phytoplankton biomass increased with the rise of TN and TP concentrations. Relationships between zooplankton biomass and phytoplankton biomass showed that zooplankton played a limited role in the control of algae in eutrophic lakes. Nutrient availability is much more important than zooplankton grazing pressure in controlling phytoplankton growth in lakes. For most sites in Lake Taihu, reduction of nutrient loading, as well as macrophyte conservation, zappears to be especially important in maintaining high water quality and regulating lake biological structure, but for M sites, it’s urgent to control nutrient inputs rather than to restore macrophyte community.     

Dissolution behavior of nutrient elements from dephosphorization slag in the weakly acidic solution

Journal of Material Cycles and Waste Management - Dephosphorization slag is primarily composed of CaO–SiO2–FeO–P2O5 slag system. As it contains abundant valuable components,...     

Seasonal effect on N2O formation in nitrification in constructed wetlands

Constructed wetlands are considered to be important sources of nitrous oxide (N(2)O). In order to investigate the contribution of nitrification in N(2)O formation, some environmental factors, plant species and ammonia-oxidizing bacteria (AOB) in active layers have been compared. Vegetation cells indicated remarkable effect of seasons and different plant species on N(2)O emission and AOB amount. Nitrous oxide data showed large temporal and spatial fluctuations ranging 0-52.8 mg N(2)O m(-2)d(-1). Higher AOB amount and N(2)O flux rate were observed in the Zizania latifolia cell, reflecting high potential of global warming. Roles of plants as ecosystem engineers are summarized with rhizosphere oxygen release and organic matter transportation to affect nitrogen transformation. The Phragmites australis cell contributed to keeping high T-N removal performance and lower N(2)O emission. The distribution of AOB also supported this result. Statistical analysis showed several environmental parameters affecting the strength of observed greenhouse gases emission, such as water temperature, water level, TOC, plant species and plant cover.     

Current status and historical variations of phthalate ester (PAE) contamination in the sediments from a large Chinese lake (Lake Chaohu)

The residual levels of phthalate esters (PAEs) in the surface and two core sediments from Lake Chaohu were measured with a gas chromatograph–mass spectrometer (GC–MS). The temporal–spatial distributions, compositions of PAEs, and their effecting factors were investigated. The results indicated that di-n-butyl phthalate (DnBP), diisobutyl phthalate (DIBP), and di(2-ethylhexyl) phthalate (DEHP) were three dominant PAE components in both the surface and core sediments. The residual level of total detected PAEs (∑PAEs) in the surface sediments (2.146?±?2.255 μg/g dw) was lower than that in the western core sediments (10.615?±?9.733 μg/g) and in the eastern core sediments (5.109?±?4.741 μg/g). The average content of ∑PAEs in the surface sediments from the inflow rivers (4.128?±?1.738 μg/g dw) was an order of magnitude higher than those from the lake (0.323?±?0.093 μg/g dw), and there were similar PAE compositions between the lake and inflow rivers. This finding means that there were important effects of PAE input from the inflow rivers on the compositions and distributions of PAEs in the surface sediments. An increasing trend was found for the residual levels of ΣPAEs, DnBP, and DIBP from the bottom to the surface in both the western and eastern core sediments. Increasing PAE usage with the population growth, urbanization, and industrial and agricultural development in Lake Chaohu watershed would result in the increasing production of PAEs and their resulting presence in the sediments. The significant positive relationships were also found between the PAE contents and the percentage of sand particles, as well as TOC contents in the sediment cores.     

哈尔滨市水资源基本情况及开发利用现状

以水资源可持续利用支撑经济社会可持续发展为核心,坚持全面规划,统筹兼顾,综合治理原则,紧密结合哈尔滨市水资源具体特点,通过对水资源开发利用现状调查与评价,对经济社会发展过程中中远期各阶段进行需水预测,对水环境治理、城市供水、城市排水和污水处理等方面进行规划,提出哈尔滨市水资源可持续开发利用与保护的对策,强调了水资源的节...     

生态系统健康与生态恢复及工程相应关系初探

自然生态系统健康的评价因素有组织结构、活力、恢复力、生态系统服务功能的维护、管理选择、对相邻系统的影响、减少投入、对人类健康的影响等,其类型有健康、较健康、亚健康、不健康、患病五级;其相应的生态恢复类型为生态预防、自然恢复、生态修复、生态重建;相应的生态工程有建立自然保护区、封育、补播与放流、人工林、人工草场、人工湿地等.