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61.
模拟秦皇岛港务局中水厂处理工艺,试验确定出低浓度进水下的BAF最优水力负荷、容积负荷和气水比等可控参数,指导水厂运行。 相似文献
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为了有效去除ABS凝聚干燥工段(E区)废水中的悬浮颗粒物,解决传统装置SS去除率低、管道易堵塞和运行不稳定的问题,采用一种改进的混凝气浮装置进行处理,研究了药剂种类、药剂投加量、p H值、水力停留时间、溶气水回流比等工艺参数对ABS凝聚干燥废水中悬浮物去除效果的影响,得出新型混凝气浮装置的最佳工艺运行参数。试验结果表明:在PAC投加量为75 mg/L、阳离子絮凝剂(FO4440SSH)投加量为10 mg/L、水力停留时间12.5 min、回流比为60%的最佳工艺条件下,SS去除率可达96.6%,出水ρ(SS)为29 mg/L。该装置对SS去除效果好,运行稳定,具有广阔的应用前景。 相似文献
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Yanyang Liu Bin Men Aibin Hu Qingliang You Guiying Liao Dongsheng Wang 《环境科学学报(英文版)》2020,32(4):395-407
In this work, we proposed a green and cost-effective method to prepare a graphene-based hyper-cross-linked porous carbon composite (GN/HCPC) by one-pot carbonization of hyper-cross-linked polymer (HCP) and glucose. The composite combined the advantages of graphene (GN) and hyper-cross-linked porous carbon (HCPC), leading to high specific surface area (396.93 m2/g) and large total pore volume (0.413 cm3/g). The resulting GN/HCPC composite was applied as an adsorbent to remove 2,4-dichlorophenol (2,4-DCP) from aqueous solutions. The influence of different solution conditions including pH, ionic strength, contact time, system temperature and concentration of humic acid was determined. The maximum adsorption capacity of GN/HCPC composite (calculated by the Langmuir model) could reach 348.43 mg/g, which represented increases of 43.6% and 13.6% over those of the as-prepared pure GN and HCPC, respectively. The Langmuir model and pseudo-second-order kinetic model were found to fit well with the adsorption process. Thermodynamic experiments suggested that the adsorption proceeded spontaneously and endothermically. In addition, the GN/HCPC composite showed high adsorption performance toward other organic contaminants including tetracycline, bisphenol A and phenol. Measurement of the adsorption capability of GN/HCPC in secondary effluent revealed a slight decrease over that in pure water solution. This study demonstrated that the GN/HCPC composite can be utilized as a practical and efficient adsorbent for the removal of organic contaminants in wastewater. 相似文献
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我国是世界上地质灾害最严重的国家之一。本文以重庆市为例,对九大城区各种地质灾害进行分级评价,根据本地区实际情况,得到灾害发生的频率和严重度,从而计算出灾害指数。利用这种方法,可以简单直观地对各种地质灾害进行危害程度的评价。 相似文献
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Interfacial mechanisms of heterogeneous Fenton reactions catalyzed by iron-based materials: A review
The heterogeneous Fenton reaction can generate highly reactive hydroxyl radicals(·OH)from reactions between recyclable solid catalysts and H_2O_2 at acidic or even circumneutral pH.Hence,it can effectively oxidize refractory organics in water or soils and has become a promising environmentally friendly treatment technology.Due to the complex reaction system,the mechanism behind heterogeneous Fenton reactions remains unresolved but fascinating,and is crucial for understanding Fenton chemistry and the development and application of efficient heterogeneous Fenton technologies.Iron-based materials usually possess high catalytic activity,low cost,negligible toxicity and easy recovery,and are a superior type of heterogeneous Fenton catalysts.Therefore,this article reviews the fundamental but important interfacial mechanisms of heterogeneous Fenton reactions catalyzed by iron-based materials..OH,hydroperoxyl radicals/superoxide anions(HO_2./O_2~-.)and high-valent iron are the three main types of reactive oxygen species(ROS),with different oxidation reactivity and selectivity.Based on the mechanisms of ROS generation,the interfacial mechanisms of heterogeneous Fenton systems can be classified as the homogeneous Fenton mechanism induced by surface-leached iron,the heterogeneous catalysis mechanism,and the heterogeneous reaction-induced homogeneous mechanism.Different heterogeneous Fenton systems catalyzed by characteristic iron-based materials are comprehensively reviewed.Finally,related future research directions are also suggested. 相似文献
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Marta Marcos-García Paula García-Fraile Alena Filipová Esther Menéndez Pedro F. Mateos Encarna Velázquez Tomáš Cajthaml Raúl Rivas 《Environmental science and pollution research international》2017,24(21):17436-17445
Polyhydroxyalkanoic acids (PHAs) are natural polyesters that can be used to produce bioplastics which are biodegradable. Numerous microorganisms accumulate PHAs as energy reserves. Combinations of different PHAs monomers lead to the production of bioplastics with very different properties. In the present work, we show the capability of strains belonging to various phylogenetic lineages within the genus Mesorhizobium, isolated from Lotus corniculatus nodules, to produce different PHA monomers. Among our strains, we found the production of 3-hydroxybutyrate, 3-hydroxyvalerate, 3-hydroxydodecanoate, and 3-hydroxyhexadecanoate. Most of the PHA-positive strains were phylogenetically related to the species M. jarvisii. However, our findings suggest that the ability to produce different monomers forming PHAs is strain-dependent. 相似文献