共查询到19条相似文献,搜索用时 109 毫秒
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李志娟 《环境污染治理技术与设备》2005,6(6):54-56
对斜板沉淀池在新钢公司高炉煤气洗涤中的应用研究进行了报道,同时与原系统平流沉淀池从工艺参数和经济性等方面进行了比较。运行结果表明,采用斜板沉淀池节省了投资,使循环水利用率从55%提高92%,出水水质得到显著提高,减少了环境污染。 相似文献
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炼油废水处理设施的工艺改进 总被引:1,自引:0,他引:1
针对炼油废水处理设施运行过程中存在的问题 ,采取了相应的改进措施 :在气浮池中 ,取消多孔集水管 ,增设导水集泥斜板 ,将隔墙斜置 ,改顺水流刮渣为逆水流刮渣 ;在曝气沉淀池中 ,改池底中央进水为沿回流缝多点进水 ,改周边集水槽出水为径向集水槽出水 ;将活性炭回转再生炉改造为立式移动床。运行表明 ,改造取得了满意的效果。并从设计、运行控制参数的改进以及流体力学的基础理论等方面进行了论述 相似文献
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采用絮凝沉淀+接触氧化+人工湿地工艺处理印染废水中COD研究.结果表明,斜板沉淀池出水COD平均值为1322 mg/L,此间COD去除率为38.6%;二沉池出水COD平均值为71 mg/L,此段COD去除率达94.6%;人工湿地出水COD平均值为37 mg/L,人工湿地COD去除率为48.0%.处理设施COD总去除率98.3%. 相似文献
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炼油废水处理设施的工艺改进 总被引:3,自引:0,他引:3
聂艳秋 《环境污染治理技术与设备》2003,4(3):85-87,35
针对炼油废水处理设施运行过程中存在的问题,采取了相应的改进措施;在气浮池中,取消多孔集水管,增设导水集泥斜板,将隔墙斜置,改顺水流刮渣为逆水流刮渣;在曝气沉淀池中,改池底中央进水为沿回流缝多点进水,改周边集水槽出水为径向集水槽出水;将活性炭回转再生炉改造为立式移动床。运行表明,改造取得了满意的效果。并从设计,运行控制参数的改进以及流体力学的基础理论等方面进行了论述。 相似文献
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针对季节性氨氮和有机微污染水源,通过回流生物预处理后沉淀池生物污泥至絮凝池,进行常规生物强化处理。不同污泥回流比工况的中试实验表明,污泥回流比宜在1.5%~5%之间选取,回流比再加大,生物强化效应不会增加;相比不回流工况27.6%的CODMn平均去除率,在污泥回流比为1.5%、3%和5%的运行工况下,沉淀池出水相对于预处理出水CODMn的平均去除率分别为44.5%、44.1%和45.5%;同时,在1.5%~5%之间选取污泥回流比,絮凝剂投加量减少了17 mg/L,并且沉淀池出水浊度降低,氨氮去除率也有提高。 相似文献
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废旧电路板的组成与解离特性研究 总被引:3,自引:0,他引:3
废旧印刷电路板是电子废弃物的重要组成部分,含有大量金属、玻璃纤维增强树脂、塑料等有回收利用价值的组分,但处理不当会产生严重污染。在分析中,对细碎到粒度为5mm以下的废旧电路板物料中有价资源的赋存状态和解离特性进行了系统的研究,发现金属与非金属的基本解离粒度为1 2mm,解离度为55. 51%;塑料与其他金属(除铜、铁外)是0. 5mm以上废旧电路板物料中的主要组分,树脂与铜是0 .5mm以下物料中的主要组分;物料中平均金属含量为23. 80%,平均铜含量为5. 78%。 相似文献
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Fate of bromine in pyrolysis of printed circuit board wastes 总被引:26,自引:0,他引:26
Behavior of Br in pyrolysis of the printed circuit board waste with valuable copper and oil recycling has been studied in the present work. Experimentally, pyrolysis of the printed circuit board waste generated approximately 40.6% of oils, 24.9% of noncondensible gases and 34.5% of solid residues that enriched in copper (90-95%). The cuts of the oils produced from pyrolysis of the printed circuit board waste into weighted boiling fraction were primarily light naphtha and heavy gas oil. Approximately 72.3% of total Br in the printed circuit board waste were found in product gas mainly as HBr and bromobenzene. However, by extended X-ray absorption fine structural (EXAFS) spectroscopy, Cu-O and Cu-(O)-Cu species with bond distance of 1.87 and 2.95 A, respectively, were observed in the solid residues. Essentially, no Cu-Br species was found. 相似文献
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水厂常规工艺去除有机物和总磷 总被引:3,自引:0,他引:3
有机物、总磷是我国地表水源主要污染物,涉及范围广,污染浓度高,是影响水厂出水安全的重要因素。以某水厂净水系统为依托,分析水厂常规工艺对有机物和总磷的去除效果及影响因素。研究表明,地表水源水厂所采用的混凝+沉淀+过滤+消毒的传统工艺对有机物的去除率不高,在22.1%~61.3%之间,平均去除率为38.3%;其中,混凝沉淀是常规工艺中去除CODMn的关键环节,占总去除效果的43%~68%,过滤环节去除率约为10%;温度和混凝剂投加量是影响CODMn去除效果的主要因素。常规工艺对总磷的去除效果较好,去除率约为60%~90%,冬季略低,其他季节略高;混凝沉淀单元与过滤单元对总磷均有较好的去除效果,去除率分别为25%~77%和40%~76%。在当前水质条件下,水厂现行工艺可满足常规状况下有机物和总磷的去除需要。 相似文献
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Occurrence and fate of heavy metals in the wastewater treatment process 总被引:19,自引:0,他引:19
The occurrence and the fate of heavy metals (Cd, Pb, Mn, Cu, Zn, Fe and Ni) during the wastewater treatment process were investigated in the wastewater treatment plant (WTP) of the city of Thessaloniki, northern Greece, operating in the activated sludge mode. For this purpose, wastewater and sludge samples were collected from six different points of the plant, namely, the influent (raw wastewater, RW), the effluent of the primary sedimentation tank (primary sedimentation effluent, PSE), the effluent of the secondary sedimentation tank (secondary sedimentation effluent, SSE), sludge from the primary sedimentation tank (primary sludge, PS), activated sludge from the recirculation stream (activated sludge, AS), and the digested/dewatered sludge (final sludge, FS).
The distribution of metals between the aqueous and the solid phase of wastewater was investigated. Good exponential correlation was found between the metal partition coefficient, logKp, and the suspended solids concentration. The mass balance of heavy metals in the primary, secondary and the whole treatment process showed good closures for all metal species. The relative distribution of individual heavy metals in the treated effluent and the sludge streams indicated that Mn and Cu are primarily (>70%) accumulated in the sludge, while 47–63% of Cd, Cr, Pb, Fe, Ni and Zn remain in the treated effluent. 相似文献
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Internal ecosystem feedbacks enhance nitrogen-fixing cyanobacteria blooms and complicate management in the Baltic Sea 总被引:7,自引:0,他引:7
Vahtera E Conley DJ Gustafsson BG Kuosa H Pitkänen H Savchuk OP Tamminen T Viitasalo M Voss M Wasmund N Wulff F 《Ambio》2007,36(2-3):186-194
Eutrophication of the Baltic Sea has potentially increased the frequency and magnitude of cyanobacteria blooms. Eutrophication leads to increased sedimentation of organic material, increasing the extent of anoxic bottoms and subsequently increasing the internal phosphorus loading. In addition, the hypoxic water volume displays a negative relationship with the total dissolved inorganic nitrogen pool, suggesting greater overall nitrogen removal with increased hypoxia. Enhanced internal loading of phosphorus and the removal of dissolved inorganic nitrogen leads to lower nitrogen to phosphorus ratios, which are one of the main factors promoting nitrogenfixing cyanobacteria blooms. Because cyanobacteria blooms in the open waters of the Baltic Sea seem to be strongly regulated by internal processes, the effects of external nutrient reductions are scale-dependent. During longer time scales, reductions in external phosphorus load may reduce cyanobacteria blooms; however, on shorter time scales the internal phosphorus loading can counteract external phosphorus reductions. The coupled processes inducing internal loading, nitrogen removal, and the prevalence of nitrogen-fixing cyanobacteria can qualitatively be described as a potentially self-sustaining "vicious circle." To effectively reduce cyanobacteria blooms and overall signs of eutrophication, reductions in both nitrogen and phosphorus external loads appear essential. 相似文献
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《Atmospheric environment (Oxford, England : 1994)》2007,41(15):3225-3234
This paper focuses on emissions of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (TMPD-MIB) from two latex paints applied to three substrates (aluminum, gypsum board, and concrete). The first 48 h of each experiment involved small chamber testing. Specimens were then maintained in an office environment with intermittent rotation into chambers. Emission rates were observed for periods as long as 15 months, but were relatively low after 150 h. Airborne recoveries of TMPD-MIB were a strong function of the type of paint and substrate. Recoveries in air of approximately 50% (semi-gloss paint) to 90% (flat paint) were observed after 15 months for regular applications to gypsum board, but were less than 25% after 8–15 months for applications to concrete. TMPD-MIB was recovered in the dried paint film and substrate (in the case of gypsum board) with 96±6% mass closure. 相似文献