无证上岗酿惨祸

电工作业是一般企业最通用的特种作业之一。电工几乎在每个生产企业都是必不可少的工种。因此搞好电工作业的安全培训是每个企业安全管理者必须最关注的问题之一。《安全生产法》第23条明确规定:生产经营单位的特种作业人员必须按照国家有关规定经专门的安全作业培训,取得特种作业操作资格证书,方可上岗作业。     

Stability of expanded granular sludge bed process for terylene artificial silk printing and dyeing wastewater treatment

Terylene artificial silk printing and dyeing wastewater(TPD wastewater), containing averaged 710 mg/L terephthalic acid(TA) as the main carbon source and the character pollutant, was subjected to expanded granular sludge bed(EGSB) process. The stability of the EGSB process was firstly conducted by laboratory experiment. TA ionization was the predominated factor influencing the acid-base balance of the system. High concentration of TA in wastewater resulted in sufficient buffering capacity to neutralize the volatile fatty acids(VFA)generated from substrate degradation and provided strong base for anaerobic system to resist the pH decrease below 6.5. VFA and UFA caused almost no inhibition on the anaerobic process and biogas production except that pH was below 6.35 and VFA was at its maximum value. Along with the granulating of the activated sludge, the efficiency of organic removal and production rate of biogas increased gradually and became more stable. After start-up, the efficiency of COD removal increased to 57%—64%, pH stabilized in a range of 7.99—8.04, and production rate of biogas was relatively high and stable. Sludge granulating, suitable influent of pH and loading were responsible for the EGSB stability. The variation of VFA concentration only resulted in neglectable rebound of pH, and the inhibition from VFA could be ignored in EGSB. The EGSB reactor was stable for TPD wastewater treatment.     

火电厂脱硫业前景广阔

火力发电产生的二氧化硫是大气中二氧化硫的主要来源。本文介绍了国家制定的关于火力发电产生的大气污染的一系列政策、法律和法规，作者根据这些以及二氧化硫的目前治理情况说明了火电厂脱硫业具有的广阔前景。     

油气田土壤样品中可培养丁烷氧化菌多样性研究

分别采用丁烷或丁醇选择培养法,对采自四川省达州市普光气田和湖北省江汉油田的土壤样品中的丁烷氧化菌进行了分离、纯化、16S rRNA基因序列测定及系统发育研究,探讨不同油田不同环境中烃氧化菌数量、系统发育地位以及种群多样性的差异.结果表明,初步分离获得共25株丁烷氧化菌,分属于厚壁菌门(Firmicutes)、放线菌门(Actinobacteria)和变形菌门(Proteobacteria).2个油田样品分离出的丁烷氧化菌群落结构简单,均包括芽孢杆菌(Bacillus)、假单胞菌(Pseudomonas)、红球菌(Rhodococcus)和节杆菌(Arthrobacter)4个属的细菌,苍白杆菌属(Ochrobactrum)和分支杆菌属(Mycobacterium)的细菌分离自普光气田.普光气田分离出的丁烷氧化细菌数量和多样性略高于江汉油田.     

基于“人—地—业”体系的城乡融合时空演变特征及影响因素研究——以吉林省为例

为从根本上突破城乡二元结构体制，破解“三农”问题和“乡村病”难题，“城乡融合”理念被提出，这是实施乡村振兴战略的必然选择。本文以县域为单元，利用全局主成分分析和地理探测器模型，基于“人—地—业”体系探究2000—2018年吉林省城乡融合发展特征及影响因素。结果发现：(1)研究期内吉林省城乡融合水平整体呈现上升趋势，在空间上表现为中部与西部优于东部，并形成了以市区为核心的“以一带多”发展格局。(2)研究期内人口与产业融合水平均呈现上升趋势，且产业融合在3个维度中上升幅度最大。(3)吉林省城乡融合发展是“产业主导、多元协同发展”机制下人口、土地、产业共同促进的结果，多因子协同交互作用会进一步影响城乡融合发展。(4)实现人口双向自由流动、闲置土地盘活利用、三产融合发展是推进“人—地—业”协同发展的重要环节，是实现吉林省城乡融合发展新格局和乡村全面振兴的关键举措。