Multivariate correlation analysis of bio-accumulation with soil properties and potential health risks of cadmium and lead in rice seeds and cabbage in pollution zones,China

Environmental Geochemistry and Health - A total of 475 representative cultivated land and 435 crop samples from 11 provinces of China were collected, and lead and cadmium in 6 polluted areas by...     

钽铌冶炼厂含氟废水资源化治理技术

采用合金膜电渗析法分离富集钽铌冶炼厂含氟废水中的F^-和SO₄^2-。最优的工艺运行条件为：膜对电压0.500 V,膜面流速4.09 cm/s。在此条件下电渗析30 min,F^-去除率达97.53%,SO₄^2-去除率接近100%。优化条件下运行电渗析器,一段淡水中大部分的F^-和SO₄^2-均被去除,可以直接回用。一段电渗析的浓水再经多段电渗析浓缩,以LiOH·H₂O沉淀F^-得到LiF产品,该LiF产品纯度达99.06%,满足GB/T 22666—2008标准的3级品要求。LiF收率为84.92%,F^-整体回收率为79.45%。     

Waste management under multiple complexities: inexact piecewise-linearization-based fuzzy flexible programming

To tackle nonlinear economies-of-scale (EOS) effects in interval-parameter constraints for a representative waste management problem, an inexact piecewise-linearization-based fuzzy flexible programming (IPFP) model is developed. In IPFP, interval parameters for waste amounts and transportation/operation costs can be quantified; aspiration levels for net system costs, as well as tolerance intervals for both capacities of waste treatment facilities and waste generation rates can be reflected; and the nonlinear EOS effects transformed from objective function to constraints can be approximated. An interactive algorithm is proposed for solving the IPFP model, which in nature is an interval-parameter mixed-integer quadratically constrained programming model. To demonstrate the IPFP's advantages, two alternative models are developed to compare their performances. One is a conventional linear-regression-based inexact fuzzy programming model (IPFP2) and the other is an IPFP model with all right-hand-sides of fussy constraints being the corresponding interval numbers (IPFP3). The comparison results between IPFP and IPFP2 indicate that the optimized waste amounts would have the similar patterns in both models. However, when dealing with EOS effects in constraints, the IPFP2 may underestimate the net system costs while the IPFP can estimate the costs more accurately. The comparison results between IPFP and IPFP3 indicate that their solutions would be significantly different. The decreased system uncertainties in IPFP's solutions demonstrate its effectiveness for providing more satisfactory interval solutions than IPFP3. Following its first application to waste management, the IPFP can be potentially applied to other environmental problems under multiple complexities.     

洪湖沉积物中有机氯农药的释放动力学模拟

以洪湖表层沉积物为研究对象,通过模拟试验,对悬浮状态下沉积物中有机氯农药的释放动力学过程进行了研究. 结果表明,沉积物中有机氯农药的释放具有初始阶段释放速度快而后释放速度减慢的规律. 并且,沉积物中有机氯农药的释放强度主要受化合物的水溶性控制. 水溶性相对较高的物质(如α-HCH)在水中的释放浓度较高,释放时间也更长. 另外,温度对有机氯农药的释放也有重要的影响,随着温度的升高,沉积物中有机氯农药的释放明显加强. 最后,通过试验数据分析,建立了沉积物中有机氯农药释放的一级动力学模型并确定了模型参数. 释放动力学模型的验证结果表明,实测值与模拟值吻合较好.      

Application of microbubbles in chemistry,wastewater treatment,medicine, cosmetics,and agriculture: a review

Environmental Chemistry Letters - Microbubbles are 10–100-μm bubbles with unique properties that find applications in chemical reactions, water aeration, sewage purification,...     

防弹陶瓷插板的应用性能研究

本文通过介绍防弹陶瓷插板的组成、使用性能、检测标准,结合陶瓷插板防弹机理,深入浅出的论述了防弹陶瓷插板在个体防护领域的应用。     

乡镇安监机构设置存在的问题分析

目前,在我国的安全生产监督管理体制中,国家层面上是综合监管,而省级以下的则以属地监管原则,由各省制定了相应的安全生产监督管理条例,也提出了各级人民政府对本行政区域内的安全生产工作负责,而县（区）级以下的乡镇人民政府和街道办事处应当根据安全生产监督管理工作的需要,建立或者确定安全生产监督管理机构,配备安全生产监督管理人员,加强安全生产监督管理工作的管理模式,但尚未明确统一的安监机构,     

司法中的生态安全考量--兼论生态安全立法存在的问题

本文以一起典型的生态侵权案件为例,讨论了司法实践中如何将生态安全纳入利益衡量的范围问题.提出了根据宪法保护生态环境的精神,运用诚信原则,将生态安全考虑贯穿于案件事实的认定与法律适用全过程的方式与方法,为妥善解决纠纷提供了可供操作的思路,同时也分析了现行法律对于生态安全保护的不足.     

农村环境污染原因分析及防治措施研究

本文全面分析了造成农村环境污染的主要原因,并提出了防治措施。     

水力除灰系统运行分析与对策

本文介绍了水力除灰系统运行中存在的一些问题,如灰渣沉淀性差,灰水分离器故障停台,水膜除尘器故障导致烟气带水等,并针对这些问题进行分析研究,并提出了相应的完善措施。