UASB-接触氧化法处理石化废水设计.doc

毕业设计（论文）中文摘要

UASB-接触氧化法处理石化废水设计

摘要：高浓度、高甲醛含量的有机废水，水质复杂，且可生化性较差，如果直接进行常规的生化处理会影响其正常运行和处理效果。采用UASB加好氧处理的联合工艺，废水首先通过UASB进行生物降解，把复杂的有机物降解转化为简单的、小分子有机物，提高了废水的可生化性，UASB对有机物的去除率为80%-90%，再通过接触氧化池得到净化，使出水达标排放。UASB内污泥浓度高，平均污泥浓度为20－40gVSS/L，有机负荷高，水力停留时间短，无混合搅拌设备，靠发酵过程中产生的沼气的上升运动，使污泥床上部的污泥处于悬浮状态，对下部的污泥层也有一定程度的搅动，污泥床不填载体，节省造价及避免因填料发生堵塞问题，UASB内设三相分离器，被沉淀区分离出来的污泥重新回到污泥床反应区内，可以不设沉淀池和污泥回流设备。接触氧化法具有有机负荷高、处理效果好、能耗少、滤料不结团、不堵塞、传质效率高、安装管理方便等优点。

关键词：石化废水UASB接触氧化

毕业设计（论文）外文摘要

ProcessDesignofUASB-contactoxidationforpetrochemicalWastewater

Abstract:Organicwastewaterwithhighdensityandhighformaldehydecontentwillbepossessionofcomplexityandpoorbiodegradability.Onconditionthatdirectingconventionalandbiologicaltreatmentwouldhaveeffectonitsnormaloperationanddisposalimpact.UASBaerobictreatmentincreasesthejointprocess:thewastewaterfirstgetacrossintheUASB,whichhavehighbiodegradability,thencomplicatedorganiccompoundwilldecompoundsintoordinary,smallorganicmolecules,andthisstepwillarisethebiodegradabilityofthewastewater,theremovalrateofUASBis80%-90%.Afterwardtheordinary,smallorganicmoleculeswillgetthroughcontactoxidationpoolstopurifyusingwaterdischargestandard.SludgeintheUASBhavehighconcentrations,andtheaverageconcentrationwillbe20-40gVSS/L.UASBisprovidedwithhighorganicburthen,andhydraulicretentiontimeisshort,withnomixer,theincreasedmovementatthedepartmentofsludgesuspendedstateisproducedbythefermentationprocessonmarshgas,thelowerlayerofsludgeisalsoacertaindegreeofagitation.Thesludgebedwithnocarrierwillsavecostsandavoidtroublesarousedbywadjam.UASBhavethree-phaseseparatorinside,sludgeseparatedbysedimentationareareturntothereactorzoneofsludgebed,andnosedimentationareaandreturningequipmentisrequired.Contactoxidationmethodhaveadvantagesuchas,highorganicburthen,admirableimpact,lowenergyconsumption,sievewithnocommix,noplug,transferefficaciously,constructandmanageeasily.

Keywords:petrochemicalwastewater;UASB;contactoxidation

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