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Hou Hao Liu Zixing Zhang Jia Zhou Jizhi Qian Guangren 《Environmental science and pollution research international》2021,28(1):133-155
Environmental Science and Pollution Research - With the development of industry, sustainable use of natural resources has become a worldwide hot topic. Heavy metal–containing sludge (HMS) is... 相似文献
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Two parallel membrane bioreactors (MBRs) were operated under different calcium dosages (168.5, 27 mg/L) to gain a better understanding of the mechanism of retarding membrane fouling by adding calcium. The results showed that the particle size of sludge flocs increased and the particle size distribution tended to be narrow at the optimum dosage (168.5 mg/L). Calcium was effective in decreasing loosely bound extracellular polymeric substances (LB-EPS) in microbial flocs and soluble microbial products (SMP) in the supernatant at the dosage of 168.5 mg/L by strengthening the neutralization and bridging of EPS with flocs. Furthermore, the amount of CODS and CODC decreased in both the mixed liquor and the fouling cake layer on the membrane surface. In order to compare the filtration characteristics of cake layers from the MBRs with the two calcium dosages, the specific cake resistance and the compressibility coefficient were measured. The specific cake resistance from the MBR with optimum dosage (168.5 mg/L) was distinctly lower than that with low dosage (27 mg/L). The compressibility coefficient of the cake layers under two dosages were respectively attained as 0.65, 0.91. Scanning electron microscopy (SEM) and three-dimensional confocal scanning laser microscope analysis (CLSM) images were utilized to observe the gel layer directly. 相似文献
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对吹气-吸收法测定废水中硫化物进行了吸收试验,提出了用去离子除氧水配制硫化物标液,可增加其稳定性;用ISO硫化物吹脱器取代普通气吸收装置,可提高硫化物回收率。试验结果表明,改进后方法的精密度,准确度及适用怀强垃令人满意。 相似文献
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韩子兴 《安全.健康和环境》2021,21(11):52-56
针对安全生产法规标准获取、识别、转化、传达、评价工作中存在的渠道不畅、识别不规范、条款转化无序、信息传达表面化、符合性评价空洞等常见问题,梳理解析实用对策,提出识别-转化-评价双循环流程,"2清单3表单"信息链,以及条款转化率的正向、逆向查验方法.通过细化、规范工作环节,设计持续稳定的工作机制,全面提高法规标准识别质量,对企业依法办事,全面保障安全生产具有现实意义. 相似文献
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用正交试验法优选氰化物分析的主要测试条件,试验、讨论影响测定结果精确度的关键因素及其作用规律,并对存在的各种技术问题提出探讨意见。 相似文献
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韩子兴 《石油化工环境保护》1996,(4)
介绍了用红外分光光度法测定液氨中油的分析方法。样品经三氯三氟乙烷或四氯化碳萃取后测定总萃取物,随后将萃取液通过氟罗里硅土吸附柱分离非极性的碳氢油和烃的极性衍生物,并测定碳氢油,烃的极性衍生物由总萃取物与碳氢油含量之差间接求得。用本方法测定了镇海炼化公司氨回收的精制液氨及大化肥装置的液氨中油的含量,并对油组分特性进行了分析。 相似文献
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含硫污水油—水旋流分离技术研究 总被引:6,自引:0,他引:6
介绍了自行研究开发的适用于炼油含硫污水除油的新型旋流器 ,利用这种高效、节能的污水除油技术 ,油珠的最小分离粒径为 1 0 μm,平均除油效率为 66%。 相似文献
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防毒面具镜片防雾效果是影响其使用性能的主要因素之一。本文介绍了防毒面具镜片防雾技术的发展和应用情况以及防雾效果评价方法,实践表明现代防毒面具将主要采用合理的结构设计来获得可靠的防雾效果。 相似文献