城市污水处理厂的污泥臭氧化减量技术

针对城市污水处理厂产生大量的污泥,综述了臭氧化污泥减量技术的国外研究成果,介绍并讨论了臭氧化污泥减量的原理、污泥减量效率与臭氧剂量的关系、臭氧化污泥回流对污水处理运行效果及对污泥沉降脱水性能的影响,对臭氧化污泥减量技术进行经济评估,表明臭氧化污泥减量技术具有广泛的应用价值。     

低剂量臭氧氧化与延时曝气活性污泥法相结合的污泥前置减量技术在集中式工业污水处理厂的应用实践研究

介绍污泥减量技术的应用背景和已有的污水处理中的污泥减量技术及各自的优势和不足。通过臭氧催化氧化与延时曝气相结合的污泥减量技术在集中式工业污水处理厂的应用实践,提出了污泥表观产率新的计算公式Yobs=a VSS/g COD去除+b NVSS/g TSS进水。发现了污泥表观产率的由对照组的Yobs VSS=0.188g VSS/g COD去除,Yobs NVSS=0.442g VSS/g TSS进水降低到实验组的Yobs VSS=0.104g VSS/g COD去除,Yobs NVSS=0.177g VSS/g TSS进水。,VSS表观产率下降了44.7%;NVSS表观产率下降了60%。文中分析阐述了污泥表观产率与系统削减COD负荷和进水TSS的关系,臭氧氧化部分回流污泥与延时曝气相结合的污泥减量技术的基本原理,比较了它与传统臭氧氧化污泥减量技术不同之处,及在工业污水污泥减量上的意义,并指出臭氧氧化污泥减量当前在生产应用上仍存在的问题。     

臭氧化污泥减量技术对出水水质的影响

为了探讨剩余污泥减量问题,采用臭氧氧化法处理曝气池回流污泥,考察臭氧氧化污泥减量技术对出水COD、NH3-N和TP的影响。实验结果表明：剩余污泥的比脱氢酶活性随通臭氧时间的延长而减少：在被臭氧氧化的泥水混合液中,SCOD的值是随时间的延长而增大;臭氧处理后的剩余污泥排入曝气池中,出水的COD、TP去除率无明显变化,出水NH3-N去除率有所增加。     

臭氧化污泥减量技术的研究进展

阐述了臭氧化污泥减量技术的机理、臭氧化污泥的性状变化、污泥减量效果的影响因素、污泥臭氧化对出水水质的影响等。表明了臭氧化污泥减量技术在不影响出水水质的情况下,能有效地减少剩余污泥量,还能提高系统的反硝化能力,具有广阔的应用前景。     

涡流空化协同臭氧氧化污泥减量实验研究

以城镇污水处理厂二沉池剩余污泥为处理对象,采用涡流空化协同臭氧氧化污泥减量的工艺,探究了两者协同作用下污泥的减量效果、碳源释放效果以及氮磷元素的溶出量.结果表明:当臭氧投加量为15mgO3/gSS时,MLSS从3 500mg/L下降至1 140mg/L,去除率达67.4％.MLVSS从1 130 mg/L下降至210m...     

污泥臭氧减量对淹没式生物膜工艺运行效能的影响

针对淹没生物膜法(SBF)和污泥臭氧化各自在污泥减量方面的优点,提出了化学臭氧化和复合生物膜法相结合的污泥减量工艺,并对臭氧化对SBF运行效能的影响进行了实验研究。通过2个并行的SBF系统污泥臭氧化结果进行对比,结果显示臭氧化能够显著降低系统的污泥产率(0.043 kg/kg,较不加臭氧化的SBF系统下降了76%),同时不对硝化和有机物的去除作用产生明显的影响,系统出水水质良好。     

利用臭氧氧化实现污泥的减量

采用AO工艺,对应用臭氧氧化实现污泥减量进行了研究。结果表明,随着臭氧氧化污泥比例的增加,污泥表观产率系数也随之降低,在臭氧投量为0.05gO3/gSS,每天氧化的污泥分别为反应器内污泥的10%、20%、30%时,污泥表观产率系数分别减少24%、46%、73%。虽然随着污泥氧化比例的增大,氧化系统出水COD有所增加,但氧化系统仍能保持其生物处理能力,COD去除率在88%以上。污泥的耗氧速率(OUR)测量结果显示,长期臭氧氧化后,氧化系统OUR为38.2mgO2/gVSS·h,对照系统的OUR为45.9mgO2/gVSS·h,虽然氧化系统OUR略小于对照系统,但氧化系统中的污泥仍有很高的活性,臭氧氧化基本未对系统的生物处理能力产生不利影响。     

以剩余污泥减量化为目标的废水生物处理技术研究进展

以剩余污泥减量化为目标,针对活性污泥法处理污水而产生大量污泥的现象综述了污水生物处理技术研究的三个主要方面,即对剩余污泥的后处理(污泥产生后再处理)、减少污水处理过程中污泥的产量和污泥原位降解。     

废水处理过程中污泥减量技术及机理研究进展

针对废水处理过程中污泥的有效减量化问题,介绍对比了目前国内外污泥处置技术及其运行成本,对已有4项污泥减量技术机理及其研究现状分别进行了归纳与总结,并就目前污泥减量工程应用实例中存在的技术难点进行了总结分析。对废水处理过程中污泥减量技术未来的研究方向给予了展望,建议对基于微生物代谢的污泥减量机理进行全面的综合生命周期评估,通过评估这些污泥减量机理的可持续性,实现污水处理厂的总体可持续发展战略;重点发展原位污泥减量技术,通过微调SRT、HRT及温度等操作条件,达到污染物去除与污泥减量之间运行条件的平衡;加强对微生物代谢途径的研究,以验证采用该途径实现污泥减量化的小试、中试结果。     

白龙港污泥暂存库区污泥压滤液处理

我国市政污水处理厂脱水污泥的主要处置方式为填埋,垃圾填埋场接受市政脱水污泥时,会设置污泥暂存坑存放市政污泥.白龙港污水处理厂污泥暂存场中长期存有污泥,大量雨水渗入致使污泥填埋的稳定性大幅降低.取出稳定化的污泥进行脱水,可进一步减量污泥,又可腾出大量污泥填埋空间.对暂存库区污泥进行脱水时,会产生大量的高氨氮压滤液.为消除污泥储坑中污泥及其产生渗滤液对周围环境的危害,需同步处理污泥和渗滤液,以消除污泥储坑对周围环境产生的危害.文中对白龙港污泥暂存场中所产生的污泥压滤液进行试验处理,经混凝沉淀、吹脱和氧化工艺处理后,出水水质可达到下水道纳管标准.通过开展填埋污泥暂存库区污泥处置成套技术研究与示范,为白龙港污泥暂存库区污泥消纳处理提供技术支撑.     

臭氧化污泥减量化技术的研究进展

臭氧化技术是一种极具潜力的无二次污染的污泥处理技术.本文综述了在污泥减量化中物理技术、生化技术结合臭氧化的处理技术,以及改进臭氧利用效率的技术的应用研究进展,并指出今后的研究方向.     

Feasibility of Sludge Ozonation for Stabilization and Conditioning

A pilot-scale sludge treatment plant was built to investigate the feasibility of ozonation processes for waste activated sludge treatment. Ozonation of wastewater sludge resulted in mass reduction by mineralization as well as by supernatant and filtrate recycle. Another advantage of sludge ozonation is a significant improvement of settleability and dewaterability. Experimental results showed that mass reduction of 70% and volume reduction of 85% compared with the control sludge was achieved through the sludge ozonation at a dose of 0.5?gO₃/gDS. It is also interesting to note that the filterability deteriorates up to ozone dose of 0.2?gO₃/gDS and then improves considerably at a higher ozone dose. The filterability could be improved by chemical conditioning even at a low ozone dose. The economic feasibility by cost analysis reveals that ozonation processes can be more economical than other alternative processes for sludge treatment and disposal at small-sized wastewater treatment plants.     

Activated sludge process coupled with intermittent ozonation for sludge yield reduction and effluent water quality control

BACKGROUND: Ozone is applied in wastewater treatment for effluent water quality improvement (post‐ozonation) as well as for excess sludge reduction (in the recirculation line). There is some evidence that ozone dosed directly to aerobic biooxidation (ABO) process enhances degradation of recalcitrant compounds into intermediates, following their biodegradation in the same reactor. However, no information regarding the influence of ozone on sludge yield in this system was found. Therefore, the current work aimed to evaluate the effect of ozone on the sludge yield when ozone is dosed directly to the ABO process. In addition, batch and continuous treatment schemes for phenolic wastewater treatment are compared. RESULTS: The results revealed that an optimal ozone dose of ～30 mgO₃ L^?1 day^?1 reduced the sludge yield by ～50%, while effluent water quality in terms of total chemical oxygen demand (TCOD), compared with a conventional ABO process, was improved by 35.5 ± 3.6%. Slight improvement in soluble COD removal at the same ozone dose was also detected. The toxicity of effluent water was reduced as the ozone dose was increased. CONCLUSIONS: In an integrated ozonation‐ABO process it is possible to simultaneously reduce sludge yield and to improve effluent water quality, as COD and toxicity are reduced. Copyright © 2011 Society of Chemical Industry     

An Integrated Approach to Lysis-Cryptic Growth (Sludge Ozonation) and Sequencing Batch Reactor Coupled to an Anaerobic Side-Stream Reactor (SBR-ASSR): Performance and Characteristics

ABSTRACT

Anaerobic side-stream reactors (ASSR) have been suggested to reduce waste activated sludge volumes benefiting from relatively low capital/operation costs and design simplicity. In this study, an evaluation of the feasibility of combining the ASSR system with the lysis-cryptic growth (ozonation) process was made so that a part of the sludge which passed through the ASSR anaerobic tank would be then treated by ozonation before returned to the aeration tank. The main independent factor was the ozonation flowrate (OFR), which is defined as the percent of return sludge which passed through the both the anaerobic tank and the ozonation unit. Three systems were studied, an ASSR control without ozonation (OFR-0), a combined ASSR with ozonation designated as OFR-2.5 (anaerobic interchange rate [AIR] of 10% per day and 25% of the exchanged sludge being ozonated [ozone interchange rate or OIR]), and OFR-3.1 (AIR = 12.5%, OIR = 25%). The results revealed that the insertion of an ozonation step led to an enhanced total microbial activity, eukaryotic population, and nitrogen removal. The linear relationship between the observed yield and the specific oxygen uptake rate indicated that microbial predation was the major relevant mechanism for the enhanced sludge reduction. The results of measurements of particle size distribution, and sludge dewaterability rates suggest that additional studies are needed to better understand and optimize this system.     

Improving Dewaterability and Other Properties of Citric Acid Wastewater Treatment Sludge by Ozone and Peroxone

ABSTRACT

The efficacies of ozonation and peroxone (O₃/H₂O₂) pretreatments were compared for citric acid wastewater sludge conditioning with the objective of improving dewatering characteristics of the sludge. Treatment with 84 mg O₃/g dry solid (DS) and 12.5 mg/g DS H₂O₂ greatly enhanced the effectiveness of ozonation, providing sludge dewaterability similar to that obtained by ozonation at 250 mg O₃/g DS. Most importantly, treatment of citric acid wastewater sludge with 84 mg O₃/g DS and 12.5 mg/g DS H₂O₂ led to the preservation of the nutrient elements nitrogen, phosphorus, and potassium in the sludge with a minimal volatile suspended solids/total suspended solids reduction of 5.5%, which is much lower than that with ozonation at 250 mg O₃/g DS.     

活性炭载铁催化剂催化臭氧化污泥的研究

以活性炭为载体通过浸渍一焙烧法制备了活性炭载铁（Fe／AC）催化剂,并考察了铁盐种类、煅烧温度、铁盐水溶液中铁离子浓度对催化臭氧化污泥的影响及处理后污泥的相关性质变化。结果表明．采用铁离子浓度为O．20mol·L^-1的FeCl3作为铁盐水溶液、煅烧温度为500℃所制备的活性炭栽铁催化剂催化臭氧化污泥的效果最佳;处理后污泥滤饼的含水率下降近9％,污泥滤液的COD值下降46．39mg·L^-1,污泥的沉降性能优于原污泥,滤液中的铁离子能更好地固化。XRD分析表明活性炭表面所负载的铁氧化物为Fe2O3。     

Integration of continuous biological and chemical (ozone) treatment of domestic wastewater: 1. Biodegradation and post‐ozonation

The continuous treatment of domestic wastewater by an activated sludge process and by an integrated biological–chemical (ozone) oxidation process were studied in this work. Chemical oxygen demand (COD), biochemical oxygen demand (BOD), absorbance at 254 nm (UV₂₅₄) and nitrogenous compound content were the parameters followed in order to evaluate the performance of the two processes. Experimental data showed that both UV₂₅₄ and COD reductions are improved in the combined biological–chemical oxidation procedure. Thus, reductions of 59.1% and 37.2% corresponding to COD and UV₂₅₄, respectively were observed after the biological process (hydraulic retention time = 5 h; mixed liquor volatile suspended solids concentration = 3142 g m⁻³) compared with 71.0% and 78.4% obtained when a post‐ozonation step ( D _O3 = 41.7 g m⁻³) was included. During conventional activated sludge treatment, appropriate nitrification levels are only achieved with high hydraulic retention time and/or biomass concentration. Ozonation after the secondary treatment, however, allows improved nitrogen content reduction with total nitrite elimination. Post‐ozonation also leads to a higher biodegradability of the treated wastewater. Thus, the ultimate BOD/COD ratio goes from 0.16 after biological oxidation to 0.34 after post‐ozonation with 41.7 g O₃ m⁻³. © 1999 Society of Chemical Industry     

臭氧尾气回用对曝气池污泥影响研究

将活性污泥分别在14.68、30.72、43.84 mg/L 3种臭氧浓度下进行氧化,同时以纯氧曝气作为平行实验,考察臭氧尾气对活性污泥的影响。结果表明,污泥经纯氧曝气后,在反应时间内并无明显变化,但在臭氧氧化过程中,污泥ATP下降,同时上清液中COD、TP、TN上升,且臭氧浓度越高,变化速率越大,其原因为污泥发生了溶胞现象;臭氧氧化后,污泥MLSS、MLVSS减少,污泥呼吸速率下降,但沉降性得到改善,同样随着臭氧浓度的升高,变化更为显著。经14.68、30.72 mg/L臭氧氧化后的污泥,其硝化能力、生化能力与反应前并无明显差距,而经43.84 mg/L臭氧氧化后污泥的硝化能力、生化能力明显弱于反应前。