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本文介绍了通过多层介质散斑照相退放大技术记录负片,采用逐点分析法测量受内压1?MnR钢制球形容器的内表面半椭圆形裂纹的SCOD及其应力强度因子K_1,并与Schmitt-Kiem解作了比较,两者符合得很好。 相似文献
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Effects of polyacrylamide on microbial density levels and biodegradability in waste‐activated sludge
Ching‐Ping Chu Duu‐Jong Lee Bea‐Ven Chang Chian‐Sen Liao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2001,76(6):598-602
This study addressed the possible role of polyelectrolyte flocculation on microbial density levels in a waste‐activated sludge. Such an effect is commonly ignored. Applying polyelectrolyte reduced the density level of coliform bacteria in the flocculated sludge. Polyelectrolyte also reduced the 5‐day biochemical oxygen demand of sludge, possibly retarding the subsequent biodegradation processes. © 2001 Society of Chemical Industry 相似文献
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Irradiation treatment of sewage sludge was carried out using an electron beam accelerator.The effects of irradiation dose,sludge water content and sludge thickness on the breakdown of sludge flocs,thus the formulation of soluble chemical oxygen demand (SCOD) and soluble total nitrogen (STN),and the reduction of MLSS and endogenous OUR,and so on,were investigated.It was observed that,with increased doses,the SCOD,STN and UV absorption intensity of the sludge supernatant increased rapidly with similar trends,and MLSS considerably decreased,all indicating that a large amount of the cell contents of sewage sludge were released by electron beam irradiation.The results of endogenous OUR also showed that a large number of microorganisms in sewage sludge were killed or deactivated.Zeta potential sludge became more positive with increased doses,implying that the dewatering performance of sewage sludge was not adversely affected.It was also found that the thickness of sludge was an operation parameter of great importance in the electron beam treatment of sewage sludge due to the relatively short penetration depth in water/sludge of the high-energy electrons. 相似文献
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污泥发酵液为碳源的反硝化过程亚硝酸盐积累 总被引:2,自引:0,他引:2
以污泥发酵液为碳源,通过批次试验研究了不同溶解性有机物的质量浓度与硝酸盐氮质量浓度之比(ρ(SCOD)/ρ(NO-3-N))和分次投加碳源时反硝化过程亚硝酸盐的积累特性.试验结果表明:不同ρ(SCOD)/ρ(NO-3-N)条件下NO-2-N都得到积累;ρ(SCOD)/ρ(NO-3-N)<4时,NO-2-N的最大积累质量浓度和积累速率随着ρ(SCOD)/ρ(NO-3-N)的增加而增大,分别达12.83 mg/L和0.107 mg/(L·min).分次投加发酵液与1次投加发酵液相比,NO-2-N的最大积累质量浓度相差很小,但分次投加能保持稳定的NO-2-N积累.另外,以污泥发酵液为碳源的反硝化过程,反硝化过程NO-2-N的积累和发酵液的低pH导致N2O的释放与ρ(SCOD)/ρ(NO-3-N)成正相关.因此,在构建反硝化耦合厌氧氨氧化系统时,分次投加发酵液具有很大优势,不仅可产生稳定的NO-2-N积累,弱化有机物对厌氧氨氧化菌的抑制作用,还可减少N2O的释放. 相似文献
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超声破解促进污泥两相厌氧消化性能研究 总被引:3,自引:1,他引:2
以频率为40kHz,声能密度为0.1、0.3和0.6W/mL的超声波对城市污水处理厂的剩余污泥进行超声破解,研究破解效应对污泥两相厌氧消化工艺去除有机物的效果、生物气产量和产气率的影响。结果表明,超声破解能显著提高污泥的溶解性COD(SCOD)浓度、对有机物的去除率、生物气产量和产气率,缩短两相厌氧消化工艺的污泥停留时间。污泥在声能密度为0.6w/mL的条件下破解60min后,SCOD从440mg/L提高到8844mg/L,COD的溶出率达到32.0%。对原污泥和经超声波破解60min的污泥进行两相厌氧消化试验,结果显示:经超声波破解后,对COD和总挥发性固体(VS)的去除率较原污泥分别提高了一半左右,产气量和产气率分别增长了125.3%和72.5%。 相似文献
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采用高压脉冲电场技术(PEF)处理城镇污泥,分析电场强度、频率、波形、占空比对污泥破壁效果的影响,并优化不同控制条件下的试验效果。结果表明:4种控制参数对污泥破壁效果均有很大的影响;其中,占空比越低,污泥破壁效果越佳;在120 min处理时间内,电场强度为12 kV/cm、频率为50 Hz、占空比为10%、波形为方波时,SCOD增幅为398.8%。这是首次在研究中使用该技术进行污泥处理将SCOD的含量提高近4倍。说明,PEF技术参数的优化有着显著提高污泥资源化利用的潜力。 相似文献
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研究了超声波破解污泥的情况.在超声波单独作用及超声波/碱作用下,测定SCOD(溶解性COD)的量,分析超声波、超声波/碱对污泥破解的效果.结果表明,从镜检中可以看到,污泥絮体随超声波作用时间的延长越来越散;SCOD随超声波作用时间的延长而增加;超声波与碱协同作用对污泥的破壁效果比超声波单独作用好. 相似文献