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低温生活污水强化混凝试验 总被引:1,自引:1,他引:0
鉴于低温(低于12℃)条件下兼性生化工艺难以满足进入后续生态单元COD及TP处理要求,拟采用强化混凝法作为低温季节补充工艺。研究表明:在低于12℃时采用单一混凝剂PAC(聚合氯化铝)处理效果好于其他单一混凝剂,投加助凝剂PAM可以小幅度提高浊度去除率,考虑实际应用,确定最佳投药方式为单一混凝剂PAC。在最佳混凝条件下PAC投加量为70mg/L时,COD、浊度及TP平均去除率分别为82.75%、98.10%、96.50%,高于兼性生化较高温度处理效果,可满足后续生态处理要求,故采用强化混凝法作为兼性生化工艺低温条件补充工艺切实可行。 相似文献
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(上接第2期)
大量实践证明,要达到好的污泥脱水效果,常常需要将无机混凝剂和有机絮凝剂结合使用.赵立志等[19]研究了无机混凝剂与聚丙烯酰胺系列有机絮凝剂在处理废水中的协同作用.结果表明:在处理钻井废水时,FeCl3与PAM系列絮凝剂复合使用处理效果优于单纯使用FeCl3的处理效果;为达到较好的处理效果,应先加无机混凝剂;PAM相对分子质量应大于500万,才能有比较好的絮凝效果.刘立华[20]等对二甲基二烯丙基氯化铵与聚合硫酸铁单独及组合使用时污泥的脱水性能进行比较,结果表明,二者复配对污泥比阻的降低和滤液浊度与COD的去除效果最好,二者组合使用时,所需用量仅为单独使用的一半. 相似文献
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以市政污泥为研究对象,探究了低温耦合次氯酸钠对污泥的破解效果,以及后续减量化及可生化性的影响。在反应温度为80℃、NaClO投加量为166.7 mg/g、反应时间为60 min的实验条件下,破解液中SCOD可以达到13 210 mg/L,COD破解率达到42.54%。破解液中的多糖及蛋白质质量浓度可达到587.3、376.8 mg/L,说明该方法可有效破解污泥,药剂投加成本仅为0.029元/g。污泥SS去除率达到30.71%,可有效减少污泥预处理成本,实现污泥减量化,并缩减污泥后续处置成本。经加热处理后液相中的余氯在1.0 h内可降至0.37 mg/L,破解液的碳氮比由10.04提高到28.97,但BOD5/SCOD仅为0.282。结合反应过程中TCOD和蛋白质的变化,以及三维荧光光谱表征,推测可能是ClO-与部分易降解有机物发生矿化反应,导致破解液的可生化性有所降低。研究结果表明该方法对污泥减量化效果显著,药剂投加成本低,可生化性可接受,可为污泥的减量化及资源化利用提供一定参考。 相似文献
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为提高制革废水生化系统的处理效率,减少制革废水污泥排放,通过向好氧系统和污泥消解池投加功能菌剂和营养剂的方式提高生化系统生物活性,提高污染物的去除率,减少污泥排放量.试验结果表明:每日在好氧池投加经现场活化的1#菌制剂20 mg/L、营养剂10 mg/L后,生化系统对CODCr和氨氮的去除有所提高,增效后生化系统的CODCr平均去除率为96.8%,氨氮平均去除率为97.6%,均高于对照组;每日向污泥消解池投加活化的2#菌制剂50 mg/L、营养剂25 mg/L后,试验组系统剩余污泥减量高达71.3%,污泥减量效果明显.为了解生物增效后好氧池菌群变化情况,对好氧池活性污泥进行高通量分析,分析结果表明,生物增效后生化系统菌种数量有所增加,部分有效功能菌的丰度明显提升. 相似文献
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水解酸化+改良型A/O工艺处理电镀废水尾水效能研究 总被引:1,自引:0,他引:1
以水解酸化与改良型A/O法为主体工艺,通过对A/O系统泥水回流方式等进行改良,并添加不同填料后,系统考察了对实际电镀废水尾水的处理效果。结果表明,在电镀废水尾水中添加部分生活污水后,随着混合废水可生化性的提高,废水处理效率也随之升高。在混合废水(电镀废水物化出水和生活污水体积比为1:3),HRT=18h的条件下,系统对COD、NH3-N、TN的去除率分别为83%、98%和80%。同时,系统内添加火山岩及组合填料后,既能增加系统内污泥含量,防止污泥流失,同时能显著增强系统对电镀废水中有机物与氨氮的去除效果。 相似文献
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针对合肥市循环经济园园区内混合农药污水浓度较高、可生化性较差等特点,采用混凝-SBR物化处理和生化处理相结合的工艺处理典型化工园区混合型农药废水,并进行中试研究。首先考察了混凝剂和助凝剂投加量对废水物化处理效粜的影响,并得到最佳药剂投加量;然后验证了此工艺对化工园区混合农药废水的处理效果,最后进行了此工艺抗冲击能力的实验。结果表明,此物化、生化相结合的处理工艺对化工园区混合农药废水处理效果良好,COD,氨氮的去处率达80%以上,说明该工艺可以在一定程度上处理此类废水。 相似文献
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为了提高脱氮除磷的效率,采用序批式生物反应器(SBR)工艺处理模拟生活污水,考察了不同温度下N/P、污泥龄(SRT)对厌氧/好氧/缺氧序批式生物反应器(AOA-SBR)工艺同步脱氮除磷效能的影响。结果表明:当温度为10 ℃、N/P为2~3、SRT为20 d时,NH4+-N、TN和TP去除率分别为78%、69%和56%,污泥产率YS为0.339 kgSS/(kgBOD5),污泥含磷率PC为4.68%。当温度为25 ℃、N/P为3~5、SRT为15 d时,NH4+-N、TN和TP的去除率分别为88%、83%和91%,污泥产率YS为0.253 kgSS/(kgBOD5),污泥含磷率PC为6.35%。当温度为35 ℃、N/P为5~7、SRT为10 d时,NH4+-N、TN和TP去除率分别为80%、66%和73%,污泥产率YS为0.225 kgSS/(kgBOD5),污泥含磷率PC为7.42%。污泥产率YS随着温度和污泥龄的增加而降低,通过调节温度和污泥龄能够实现污泥减量。 相似文献
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为研究耐盐污泥膨胀发生的原因、过程以及控制方法,利用革新MUCT工艺重点考察了10 mg.L-1盐度长期驯化的耐盐污泥在低溶解氧条件下发生污泥膨胀的过程。通过不同方式进行控制,同时比较膨胀前后系统对有机物和氮磷的去除能力,结合污泥微膨胀节能理论提出利用污泥微膨胀提高含盐污水生物处理效率的方法。结果表明:耐盐污泥在长期低溶解氧条件下会发生膨胀;盐度降低导致污泥膨胀加剧;提高盐度可有效抑制其膨胀;当好氧2段溶解氧(DO2)维持在1.0 mg.L-1,好氧1段溶解氧(DO1)维持在2.0 mg.L-1时,污泥容积指数(SVI)维持在190~210 ml.g-1之间,稳定处于微膨胀状态。微膨胀状态下系统出水浊度大大降低,可以利用低氧微膨胀状态提高含盐污水处理效率。 相似文献
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针对煤化工废水中存在的高浓度油及油泥的问题,本研究制备了高电荷、低聚合度的无机复合材料和低电荷、高聚合度的有机复合材料,探究无机、有机复合材料协同作用下对煤化工废水中油及油泥的聚结分离效果以及对废水中有机物的去除特性。结果表明,无机、有机复合材料在复合比例为500∶1的条件下,废水中油和固体悬浮物(SS)去除率分别达到55%和98%;现场试验发现,无机、有机复合材料对油含量1700~2000mg/L,SS含量为1500~2000mg/L的废水,油和SS的去除率一直稳定于50%和95%左右,表现出较好的稳定性;进一步对废水中典型有机物的去除效果研究可知,该复合材料同时也对废水中各类有机物有较好的去除效果,多环芳烃(PAHs)、苯系物和酚类物质的去除率可达到82.85%、41.9%和37.56%。可以发现,无机、有机复合材料可有效解决煤化工废水中油及油泥的去除问题,具有广阔的产业化应用前景。 相似文献
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Yaobin Zhang Yanwen Jing Jingxin Zhang Lifang Sun Xie Quan 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2011,86(2):199-204
BACKGROUND: Zero valent iron (ZVI) is expected to be helpful for creating an enhanced anaerobic environment that might improve the performance of the anaerobic process. Based on this idea, a ZVI packed upflow anaerobic sludge blanket reactor (ZVI‐UASB) was developed to enhance azo dye wastewater treatment. RESULTS: The ZVI‐UASB reactor was less influenced by a decrease in the operational temperature from 35 °C to 25 °C than a reference UASB reactor that did not contain ZVI. In addition, chemical oxygen demand (COD) and color removal efficiencies of the ZVI‐UASB reactor at an HRT of 12 h exceeded those of the reference reactor at an HRT of 24 h. The hydraulic circulation in the ZVI bed enhanced the function of ZVI so that it improved the COD and color removal efficiencies. Moreover, fluorescence in situ hybridization experiments revealed that the abundance of Archaea in the sludge of the ZVI bed was significantly higher than that at the reactor bottom, which made the reactor capable of greater COD removal under low temperature and short HRT conditions. CONCLUSION: This ZVI‐UASB reactor could adapt well to changes in the operational conditions during wastewater treatment. Copyright © 2010 Society of Chemical Industry 相似文献
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《分离科学与技术》2012,47(4):673-680
The present work studied experimentally the variations of some characteristics of the mixed liquor solution in wastewater treatment plants (WWTPs) under the effect of electrocoagulation (EC) technique. Unlike conventional methods, electrocoagulation was performed using cylindrical perforated iron electrodes to achieve a good distribution of the applied DC field onto the municipal wastewater. Effects of electrocoagulation time, applied voltage gradient, and aeration on the mixed liquor characteristics were considered. The study figured out the dependency of the local pH and oxidation potential reduction (OPR) values, near anode and cathode on these operational conditions. It was found that electrocoagulation process reached steady state conditions in no more than 60 minutes. At high voltage gradient (6 V/cm), the steady removal efficiencies of COD and nutrients exceeded 89%. While aeration showed moderate influence on removal efficiencies and wastewater sludge filterability, it significantly affected the pH and ORP near the electrodes especially at the low voltage gradient. Results also indicated that the sludge filterability was improved notably by increasing the voltage gradient to have minimal levels of specific-resistance to filtration (SRF). 相似文献
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Peng Dangcong Nicolas Bernet Jean‐Phillipe Delgenes Rene Moletta 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2001,76(6):553-558
Simultaneous organic carbon and nitrogen removal was studied in a sequencing batch reactor (SBR) fed with synthetic municipal wastewater and controlled at a low dissolved oxygen (DO) level (0.8 mg dm?3). Experimental results over a long time (120 days) showed that the reactor achieved high treatment capacities (organic and nitrogen loading rates reached as high as 2.4 kg COD m?3 d?1 and 0.24 kg NH3‐N m3 d?1) and efficiencies (COD, NH3‐N and total nitrogen removal efficiencies were 95%, 99% and 75%). No filamentous bacteria were found in the sludge even though the reactor had been seeded with filamentous bulking sludge. Instead, granular sludge, which possessed high activity and good settleability, was formed. Furthermore, the sludge production rate under low DO was less than that under high DO. Significant benefits, such as low investment and less operating cost, will be obtained from the new process. © 2001 Society of Chemical Industry 相似文献