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351.
Yunsong Liu Jiajun Chen Qingwei Wang Lanxiang Shi Yandan Shi 《Environmental science and pollution research international》2017,24(26):21011-21023
Viscosity remedial technology, which uses a water-soluble polymer mixed with remedial fluids, has been introduced in recent years to improve the removal efficacy of perchloroethylene/tetrachloroethylene (PCE) by improving oxidant coverage (i.e. sweep efficiency). Xanthan gum and hydrolysed polyacrylamide (HPAM) are relatively stable with time and temperature and possess salt and oxidation resistance, indicating that they may be good flooding agents (the former is better than the latter in this work). In this work, we quantified the polymer directly improved oxidation of PCE during transport by using a two-dimensional flow tank. Using a low pore volume (≤3.0), the removal rate of the PCE increased with the polymer concentration before stabilizing at approximately 93.00 and 88.30% for xanthan and HPAM, respectively. In this work, over 80% of PCE was removed via less than 3.0 PV of the SDS solution, whereas complete removal (100%) was achieved with less than 3.0 PV of SDS foam. Furthermore, the new experimental discoveries demonstrate that xanthan is better than HPAM and SDS foam is a better remediation agent than the SDS solution for removing PCE. 相似文献
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353.
A/O法在焦化废水处理中的应用 总被引:1,自引:1,他引:0
常州中天焦化有限公司污水处理站采用AO法处理焦化废水,该装置于1995年投入运行,至今运行状况良好。在此介绍了焦化废水的来源、水量、水质、工艺流程、经验和存在的问题,对运行中的几个阶段进行了分析和探讨。 相似文献
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355.
Assessment of sampling designs to measure riverine fluxes from the Pearl River Delta, China to the South China Sea 总被引:1,自引:0,他引:1
Ni HG Lu FH Luo XL Tian HY Wang JZ Guan YF Chen SJ Luo XJ Zeng EY 《Environmental monitoring and assessment》2008,143(1-3):291-301
The Pearl River Delta (PRD), located in South China and adjacent to the South China Sea, is comprised of a complicated hydrological system; therefore, it was a great challenge to sample adequately to measure fluxes of organic and inorganic materials to the coastal ocean. In this study, several sampling designs, including five-point (the number of sampling points along the river cross-section and three samples collected at the upper, middle, and bottom parts at each vertical line), three-point (at the middle and two other profiles), one-point (at the middle profile), and single-point (upper, middle, or bottom sub-sampling point at the middle profile) methods, were assessed using total organic carbon (TOC) and suspended particulate matter (SPM) as the measurables. Statistical analysis showed that the three- and five-point designs were consistent with one another for TOC measurements (p > 0.05). The three- and one-point sampling methods also yielded similar TOC results (95% of the differences within 10%). Single-point sampling yielded considerably larger errors than the three- and one-point designs, relative to the results from the five-point design, but sampling at the middle sub-point from the middle profile of a river achieved a relatively smaller error than sampling at the upper or bottom sub-point. Comparison of the sampling frequencies of 12 times a year, four times a year, and twice a year indicated that the frequency of twice a year was sufficient to acquire representative TOC data, but larger sample size and higher sampling frequency were deemed necessary to characterize SPM. 相似文献
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357.
为了科学使用水环境承载力方法考核地方的水生态环境治理成效,去除现有承载力方法在实际应用中存在的问题,提出了一套基于指标权重法的水环境承载力评比管控方法。通过构建包含3个一级评价指标、17个二级评价指标的两级评价指标体系,以2019年数据为例,计算得出湖州市内各区县的水环境承载力综合评估指数。结果表明,湖州市三县两区中,长兴县的水环境承载力综合指数最高,为0.58,比排在第二位吴兴区高出0.65倍,德清县最低,为0.28。该结果较好地显示了湖州市各区县的水环境承载力排名,为当地政府在水生态环境治理、保护与修复工作的成效考核上提供了重要的决策依据。 相似文献
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359.
一株生长pH较宽的产甲烷菌分离与系统发育分析 总被引:3,自引:0,他引:3
采用Hungate厌氧操作技术.从造纸厂阴沟污泥中分离到一株生长pH范围为5.5~9.5的产甲烷菌株SH4.该菌对酸碱具有良好的适应性,培养3 d后,在初始pH值6.0~8.0的培养基中甲烷产量相差不大,且基本达到最大产量.SH4革兰氏染色阳性,短杆状,多数单生,不运动;菌落近圆形,微黄;利用H2+CO2或甲酸盐作为唯一碳源生长,不利用乙酸盐,对氯霉素非常敏感.该菌最适生长pH为7.0,最适生长温度为35 oC,最适NaCl浓度为0~1.5%.实验表明,与仅添加厌氧污泥作为接种物相比,添加SH4菌液可使产甲烷启动时间缩短1/3,甲烷总产量亦有大幅提高.形态、生理生化特征以及16S rDNA序列分析表明,该菌为嗜树木甲烷短杆菌(Methanobrevibacter arboriphilus).图8参16 相似文献
360.
乙二胺基棉纤维脱硫剂的制备研究 总被引:1,自引:0,他引:1
通过氯化和胺化两步反应合成了乙二胺基棉纤维(AEAC),并用于模拟烟气中SO2的吸附研究。试验比较研究了不同种类的氯代试剂、胺化反应稀释剂和溶胀试剂对乙二胺基棉纤维制备和脱硫性能的影响。结果表明:乙二胺基棉纤维能有效吸附烟气中SO2,饱和吸附容量可达120 mg/g干纤维;以N,N-二甲基甲酰胺(DMF)作为溶胀试剂,三氯氧磷(POCl3)作为氯代试剂,并以正丁醇为胺化反应稀释剂可以大大改善乙二胺基棉纤维脱硫吸附剂的合成效果;样品含氮量和饱和硫容之间存在很好的正相关关系。 相似文献