Determinants of the ecological footprint in Thailand: the influences of tourism,trade openness,and population density

Environmental Science and Pollution Research - This paper investigates the impact of economic growth, energy consumption, tourism, trade openness, and population density on the ecological...     

基于生命周期评价法的贝壳资源化利用环境效益分析 ——以大连市为例

以贝壳为研究对象,运用生命周期评价(LCA)法对贝壳的常规处理方法和3种资源化利用方法的环境影响进行比较。结果表明,处理1kg贝壳,方案0(填埋)的环境影响值为1.04×10-14;方案1(代替水泥生产中使用的石灰石)的环境影响值为-3.78×10-12;方案2(代替浸没式生物滤柱中的陶粒填料)的环境影响值为-1.85×10-14;方案3(代替砂作为建筑材料)的环境影响值为3.62×10-14。方案1与其他3种方案相比环境效益最大。方案0中填埋过程的环境影响贡献最大,贡献率为56.60%;方案1、方案2、方案3中环境影响最大的环节是贝壳粉碎过程,贡献率分别为85.72%、93.55%、98.48%;3种资源化利用方案主要避免原材料开采过程的环境影响。     

Lightweight aggregate obtained from municipal solid waste incineration bottom ash sludge (MSWI-BAS) and its characteristics affected by single factor of sintering mechanism

ABSTRACT

To solve the disposal problem of municipal solid waste incineration bottom ash sludge (MSWI-BAS), using it as the main raw material to prepare lightweight aggregates (LWA) for resource utilization. Sintering is an important process to achieve the desired microstructure and material properties. This paper investigates the characteristics of LWA affected by single factor of sintering mechanism (sintering temperature, heating rate and soaking time). Results show that sintering temperature increased from 1130°C to 1160°C caused high-density microstructure materials gradually formed in LWA, leading to particle strength increased from 0.1 MPa to 3.64 MPa, particle density showed an overall upward trend, reaching a maximum of 916 Kg/m³ at 1160°C, and 1 h water absorption reduced from 68% to 25%. The heating rate of 15 K/min was beneficial to the formation of dense phase structure which could increase the particle strength, and the water absorption rate reached the lowest at this time, while the particle density was less affected by heating rate. When soaking time extended from 5 min to 20 min, particle strength and compressive density were gradually increased, and 1 h water absorption showed an overall downward trend, indicating that a longer soaking time was not conducive to the retention of pores. This study demonstrates that the utilization of MSWI-BAS to make high-performance LWA is feasible, along with the preferable environmental and economic benefits.

Implications: MSWI-BAS were selected to produce lightweight aggregate (LWA), so that the sludge disposal problem is reduced. The effects of sintering temperature, heating rate and soaking time on the characteristics of LWA were investigated. Compact glass structures are formed at 1150°C and 1160°C which greatly improve the strength. The heating rate has little influence on the physical properties of LWA products. The particle density of LWA increases after the sintering soaking time reaches 15 minutes.     

废钢铁在钢铁行业中应用前景研究

废钢铁是我国物资回收与再生资源利用体系中的重要资源,也是非常重要的战略性资源,是钢铁工业最主要的两种原料之一(另一种是铁矿石)。与铁矿石相比,废钢铁更符合绿色可持续发展的需要和钢铁行业超低排放政策的要求,未来废钢铁资源在钢铁工业发展中的重要性可能会不断提升。着重探讨了未来10年废钢铁资源产生量的变化趋势,以及对钢铁工业原料结构变化的影响。未来中国的废钢铁资源可能不仅能满足自身钢铁工业发展的需要,同时也可能为世界钢铁工业的发展提供重要的原料。     

关于我国报废汽车市场发展趋势的初步研究

随着汽车保有量的快速上升,我国报废汽车市场规模正在进入快速增长区间。根据发达国家的经验,报废汽车拆解与回收利用是循环经济产业的重要支柱。未来我国报废汽车市场规模的增长以及相关资源回收利用市场的发展,将会产生许多新的市场机会,也会对我国循环经济产业发展产生较大影响。     

不同水动力条件对景观水体富营养化模拟过程中藻类演替的影响

采用微宇宙培养法,分析了不同水动力条件(不循环、水循环和泥循环)对微污染景观水体富营养化模拟过程中藻类演替的影响.结果表明,水循环和泥循环使得水体的TP值前期增加后期减少,前期藻类生长主要受TP影响,而后期浊度成了重要的影响因素;水循环引起的TP值减少及蓝藻聚集状态的破坏,导致了藻类的生长明显减缓,但优势种的演化过程却...     

城市轨道交通噪声环境影响评价方法及实例分析

基于城市轨道交通噪声环境影响的特点，对城市轨道交通噪声环境影响评价的几个关键问题进行了探讨，构建了城市轨道交通噪声环境影响评价方法及预测模式。以广州市轨道交通六号线为例，对提出的噪声环境影响评价方法进行了实证分析，结果可行。     

环保制度改革下网格化环境监管发展对策建议

以环境监测监察执法垂直管理制度、镇域综合执法改革、排污许可证"一证式"管理为例,简述环保制度改革要求及各项制度可能对网格化监管产生的影响,结合江苏省各地网格化监管调研情况,分析网格化监管与制度改革的关系,提出网格化环境监管与各项制度未来协同发展的对策建议。     

地面水力压裂对井下煤层瓦斯抽采影响分析

为了研究高河煤矿地面压裂钻井作业对井下煤层瓦斯抽采效果的影响,以3#煤层E2307工作面为主要考察对象,对水力压裂前后煤层渗透率、抽采瓦斯浓度和纯量进行统计分析。研究结果表明:地面压裂钻井水力压裂后煤层反演渗透率提高了13倍以上;压裂后瓦斯浓度最大增幅为122%,最小增幅为34%,平均增幅为71%,同样,瓦斯纯量也有大幅度的提高。研究认为高河煤矿地面水力压裂作业对其高瓦斯含量、低渗透性煤层具有良好的应用前景,对同类煤矿及煤层提高瓦斯抽采效率,预防井下瓦斯动力灾害具有积极的借鉴意义。