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721.
彭展 《安全.健康和环境》2010,(2):5-5
巴陵石化烯烃事业部安全隐患治理现场,“禁止带火种”的提示牌无声地提示着施工作业人员:从细节着手,从自己做起,确保安全。新年伊始,巴陵石化重点在强化全员安全意识、强化全员安全责任和强化全员安全行为“三个强化”上下功夫,将“我要安全”贯穿生产经营的全过程。 相似文献
722.
胡君 《安全.健康和环境》2010,10(6):52-52
那天装置停车检修,连续置换了一个晚上的管线流程,不时能闻到吹扫遗留的烃类气味,经历过装置无数次大大小小的检修,潜意识中形成了化工装置现场是不可能做到百分百没有气味的观念,在对各含油污水井化验分析可燃气指标合格,又对环境气进行测试都没有什么异常后,14:00我开出了装置第一张用火作业许可证,是扩能改造项目进行管线对接碰口的作业,开始在二楼平台处动火,18:20分在对现场环境及地沟重新测爆合格后,继续进行用火作业施工。 相似文献
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724.
A laboratory scale test was conducted in a combined membrane process (CMP) with a capacity of 2.91 m3/d for 240 d to
treat the mixed wastewater of humidity condensate, hygiene wastewater and urine in submarine cabin during prolonged voyage.
Removal performance of chemical oxygen demand (COD), ammonia nitrogen (NH4
+-N), turbidity and anionic surfactants (LAS)
was investigated under di erent conditions. It was observed that the e uent COD, NH4
+-N, turbidity and LAS flocculated in ranges of
0.19–0.85 mg/L, 0.03–0.18 mg/L, 0.0–0.15 NTU and 0.0–0.05 mg/L, respectively in spite of considerable fluctuation in corresponding
influent of 2120–5350 mg/L, 79.5–129.3 mg/L, 110–181.1NTU and 4.9–5.4 mg/L. The e uent quality of the CMP could meet the
requirements of mechanical water and hygiene water according to the class I water quality standards in China (GB3838-2002). The
removal rates of COD, NH4
+-N, turbidity and LAS removed in the MBR were more than 90%, which indicated that biodegradation
is indispensable and plays a major role in the wastewater treatment and reuse. A model, built on the back propagation neural network
(BPNN) theory, was developed for the simulation of CMP and produced high reliability. The average error of COD and NH4
+-N was
5.14% and 6.20%, respectively, and the root mean squared error of turbidity and LAS was 2.76% and 1.41%, respectively. The results
indicated that the model well fitted the laboratory data, and was able to simulate the removal of COD, NH4
+-N, turbidity and LAS. It
also suggested that the model proposed could reflect and manage the operation of CMP for the treatment of the mixed wastewaters in
submarine. 相似文献
725.
726.
<正>纺织生产会给环境带来巨大影响。在每吨纺织品的染整生产过程中,高达200吨的水会被一系列化学品污染,用于加热蒸汽和热水的能源消耗也相当巨大。更令人担忧的是,现在全球的纺织产业越来越集中于环境监管制度不够健全的发展中国家,比如中国、印度、 相似文献
727.
火电湿法烟气脱硫塔模拟及优化操作分析 总被引:2,自引:0,他引:2
基于火电石灰石-石膏湿法烟气脱硫工艺,以华能福州电厂实际生产数据为依据,经对设备分别简化建模,建立了反映实际脱硫过程的脱硫塔模型,形成全工艺模拟流程,模型计算结果和实际运行数据间平均误差为0.4364%.对脱硫工艺过程进行灵敏度分析,得出循环浆液pH值、烟气流量、液气比等因素对吸收效率的影响.最后,以灵敏度分析结论为基础,借助多目标优化方法分析不同工况下各控制因素对脱硫效率的影响,得到基本优化控制范围(pH值处于5.4~5.6、烟气压力处于0~1000Pa)和相应的最优控制方案,并分析了优化操作结果的工业适用性. 相似文献
728.
729.
The elemental composition and bacteria attached in particles were investigated during granular activated carbon (GAC) filtration.The experimental results showed that trapped influent particles could form new,larger particles on GAC surface.The sloughing of individuals off GAC surface caused an increase in effluent particles in the size range from 5 to 25 μm.The selectivity for element removal in GAC filters caused an increasing proportion of metallic elements in the effluent particles.The distribution of molar ratio indicated a complicated composition for large particles,involving organic and inorganic substances.The organic proportion accounted for 40% of total carbon attached to the particles.Compared with dissolved carbon,there was potential for the formation of trihalomethanes by organic carbon attached to particles,especially for those with size larger than 10 μm.The pure carbon energy spectrum was found only in the GAC effluent and the size distribution of carbon fines was mainly above 10 μm.The larger carbon fines provided more space for bacterial colonization and stronger protection for attached bacteria against disinfection.The residual attached bacteria after chorine disinfection was increased to 10 2-10 3 CFU/mL within 24 hours at 25°C. 相似文献