共查询到20条相似文献,搜索用时 62 毫秒
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《水处理技术》2014,(7)
针对浙江省城镇污水处理厂尾水排放标准的升级要求,以浙江省某污水处理厂为改造对象,在原系统基础上增设"投加碳源"、"絮凝过滤"、"消毒"等处理工艺,完成对该污水处理厂的改造工程,并对改造后的污水处理厂进出水中各污染物浓度进行了为期1个月的监测。监测结果表明,在原系统基础上增设"投加碳源"、"絮凝过滤"、"消毒"等处理工艺,能显著提高该污水处理系统对生活污水中COD、BOD5、NH3-N、TN、TP及SS的去除能力,上述污染物的出水浓度均低于城镇污水处理厂污染物排放标准(GB 18918-2002)一级A标准,有效解决了原有A2/O工艺的运行问题,实现了城镇污水处理厂的长期稳定达标排放。 相似文献
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《广东化工》2020,(8)
广东省某城镇污水处理厂总设计规模为11×104m3/d,出水标准执行《城镇污水处理厂污染物排放标准》(GB18918-2002)一级B标准和广东省地方标准《水污染物排放限值》(DB44/26-2001)第二时段一级标准的较严值要求。为了使出水水质达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准和广东省地方标准《水污染物排放限值》(DB44/26-2001)第二时段一级标准的较严值要求,需对该厂处理工艺进行升级改造。结合该厂实际运行的进出水水质和目前处理设施的运行情况,本工程采用精密格栅+连续流砂滤池工艺对二级出水进行深度处理,提标后出水满足水质要求。 相似文献
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安徽某污水处理厂设计规模6×104 m3/d,出水标准执行《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准.此次提标在不停产的情况下,将出水标准升至《巢湖流域城镇污水处理厂和工业行业主要水污染物排放限值》(DB 34/2710-2016)中的Ⅰ类标准.本项目设计阶段充分考虑该污水厂的运行现状,通... 相似文献
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改良型Carrousel2000氧化沟由于利用氧化沟内水力循环、无动力内循环等特点,在去除BOD的同时能高效脱氮除磷,易于操作,便于管理,因而被城镇污水处理厂广泛采用.本文以修水县污水处理厂为例,介绍了改良型Carrousel氧化沟在城镇污水处理中的应用.结果表明:该污水处理厂BOD、COD、TP、TN、NH3-N的平均去除率分别为82.96%、75.68%、71.37%、38.77%、63.49%.通过改良型Carrousel2000处理的污水,出水水质达到《城镇污水处理厂污染物排放标准》(GB18918-2002)中一级标准中的B标准. 相似文献
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SUS304 stainless steel rods were oxidized at 1073 K in air to form oxide film and then immersed in NaOH solution to be polarized cathodically at a cell voltage of 125 V. The electrode emitted light due to the formation of a plasma state at the interface between the electrode surface and the solution caused by the strong electric field applied to the interface. Atomic emission lines of Fe, Cr and Ni were found in the light spectra. The intensity of light was stronger on the oxide layer than on the metal surface. From the time transient of intensities of light, the oxide layer was found to be almost removed from the surface after high-voltage polarization within 10 s. From comparison of experimental results with a model calculation assuming the sputtering of oxide film with bombardment by charged particles in the plasma phase, it was estimated that the removal of surface oxide layer was done by micro-arc discharge mechanism rather than continuous sputtering. Because the formation of micro-arc preferentially occurred on the oxide layer rather than on metal surface, the removal of oxide layer from the surface was considerably rapid. On the other hand, at the point where micro-arc discharge occurred, melting of metal surface was found. 相似文献
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以美国环保局的污染物排放标准形成文件为依据,详细介绍了美国炼焦行业水污染物排放标准,包括BPT、BAT、NSPS、PSNS/PSES、BCT标准。研究了标准的形成过程,分析了标准中各指标的意义。通过标准的制定可以看出美国在污染控制方面的时间表,这对于我国煤化工行业的标准制定和应用具有很好的借鉴作用。 相似文献
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Non-thermal plasma of microwave discharge coupled with gliding discharge was applied to convert nitrous oxide. The experiments were carried out using air or oxygen as carrier gases for N2O (5%). The overall rates of nitrous oxide conversion determined for the N2O + air mixture were slightly higher than those for N2O + oxygen. No significant effect of the carrier gas (air or oxygen) on the rate of N2O → NO conversion was observed. The effect of the power of the microwave discharge and gas flow rate (air) on the overall rate of nitrous oxide conversion and rate of N2O conversion to NO was studied. The increase of the gas flow rate from 200 to 400 N l/h resulted in an increase of the N2O conversion rates both overall (r) and to NO (rNO). For 400 N l/h, both rates were higher by about 80–100% than those determined in the experiments performed with 200 N l/h. 相似文献
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A. A. Khan 《加拿大化工杂志》1989,67(1):113-117
The reaction space of a silent discharge reactor consists of two distinct components, viz. (1) the collection of primary reaction zones (PRZ) or discharge streamers where, under the influence of free electron avalanches, primary electron molecule collisions take place and (2) the remaining reaction space which provides for secondary or quenching reactions between activated species and gas molecules. A flow model based on this concept has been proposed which accounts for the intrinsic chemical activity of the PRZs as well as their random distribution, spatial location, transient nature, and temperature field. Experimental results obtained on laboratory ozonizers have been examined to show the validity of the proposed model. 相似文献