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91.
92.
危险废物对生态环境和人类健康构成严重的危害。水泥窑协同处理危险废物能同时实现减量化、无害化以及资源化,是最有效的处理危险废物的方法。大连东泰产业废弃物处理有限公司利用水泥窑协同处理危险废物,实现废物处置与水泥生产的优化组合。 相似文献
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本文对水泥生产现场调查并做生产性粉尘作业危害程度分级,结果显示水泥生产场所的粉尘浓度高,工人接尘作业时间长。粉尘危害严重,呈现粉尘浓度高,提示生产场所粉尘浓度,减少工人的接尘作业时间,是预防水泥生产性粉尘危害的有效措施。 相似文献
95.
Guanghua Lu Changsheng Yue Guibo Qiu Min Guo Fangqin Cheng Mei Zhang 《环境科学学报(英文版)》2018,30(11):177-184
Clean and efficient treatment of high-mercury leachate produced from remediation of mercury-polluted soil has become a huge challenge for environmental scientists.In this work,cement solidification was firstly adopted to treat the high-concentration mercury leachate,which had high alkalinity.Different mercury concentrations,namely 3.120 mg/L Hg mercury leachate and 9.243 mg/L Hg mercury concentrated leachate,were separately solidified by Portland cement.The results indicated that simply using the cement can properly solidify both the leachates to meet the waste landfill standard,with liquid(mL)/solid(g) ratio(L/S ratio) of4:10–6:10.In order to make full use of mercury in the leachates,a Hg extraction method was subsequently carried out under different experimental parameters,such as temperature and p H value.It was shown that the Hg extraction ratio could reach as high as 99.84% and almost all the mercury in the leachate could be transformed to HgS precipitate;moreover,the Hg concentration in the treated leachate was reduced from 3.120 to 0.005 mg/L at p H 2.98 and 30°C,which was much less than the limit of the national standard,indicating that the leachate had been completely cleaned and could be discharged freely.Hence,simple cement solidification renders high-mercury leachate nontoxic,and the Hg extraction method can successfully recover the Hg and enable the residual leachate to be discharged safely. 相似文献
96.
Despite the widespread field and laboratory research works there are still a lot of unknown aspects about the cold in-place recycling. This paper presents the outcomes of a five year evaluation of a major highway in Iran which had been rehabilitated by cold in-place recycling. Before starting the rehabilitation process, a comprehensive field survey was performed. During the pavement surveying, type, severity and reason of distresses were investigated and PCI parameter was calculated. Furthermore, both destructive and nondestructive tests were carried out to evaluate the pavement condition and estimate the remaining life. On the basis of these investigations studied highway was divided to six design sections. Based on technical analysis four sections were recycled whereas two other sections were rehabilitated with the conventional cold milling and overlay method. Afterwards, the pavement performance was monitored during the next 5 years. After about six months of monitoring, structural failures were detected in about 10% of recycled areas. Based on field surveying, low compaction and load bearing of subgrade materials and lack of high quality unbound pavement layers accompanied by some shortcomings in recycled layer resulted in undesirable results in these areas. Based on obtained results and performed analysis a practical flowchart was presented which could be used as a project selection guideline. 相似文献