Treatment of a dyeing wastewater from a woolen mill using an A/O membrane bio-reactor

An anaerobic/oxic membrane bioreactor (A/O MBR) was used for treatment of dyeing wastewater from a woolen mill.COD and color of the wastewater were 54-473 mg/L and 40-400 dilution time (DT) respectively. The ratio of BOD5/COD was less than 0.13. By the A/O MBR process, the average removal of COD, BOD5, color and turbidity was 82％, 96％, 71％ and 99％, respectively. The average COD, BOD5, color and turbidity of effluent was 37 nag/L, 0.8 mg/L, 40 DT and 0.44 NUT respectively. The effluent COD met the local standard of reuse water in Beijing, China. The average COD volume load of the anaerobic biological tank was 0. 0483 kgCOD/(m3·d) and that of the aeration tank of the MBR was 0. 3589 kgCOD/(m3·d). The sludge load of the MBR was 0.19 kgCOD/(kg· MLSS· d) on average and the maximum of that was 0.4 kgCOD/( kg· MLSS· d).The flux of the A/O membrane bioreactor could be remained at larger than 50 L/(h· m2· 0.1MPa). The results indicated that A/O membrane bioreactor has technical feasibility for treatment of woolen mill wastewater.     

膜生物反应器处理毛纺废水的中试研究

采用中试规模(10t/d)的厌氧-好氧膜生物反应器(A/O MBR)处理毛纺印染废水.当HRT为7h,进水COD、BOD₅分别为179～358mg/L和44.8～206mg/L,试验系统对COD、BODs、色度、浊度的平均去除率分别为92.1%、98.4%、60.7%、98.9%,出水水质浓度或指标值分别为20.2mg/L、1.6mg/L、25倍、0.51 NTU.出水水质指标达到建设部生活杂用水水质标准(CJ25.1-89).A/O MBR工艺处理毛纺印染废水技术可行、操作简单、易于管理,可为工业规模应用提供技术参考.     

A pilot scale anoxic/oxic membrane bioreactor (A/O MBR) for woolen mill dyeing wastewater treatment

A pilot-scale( 10 m^3/d) anoxic/oxic membrane bioreactor( A/O MBR) was tested for dyeing wastewater treatment of woolen mill without wasting sludge in 125 days operation. Results showed that the effluent quality was excellent, i.e. effluent COD less than 25 mg/L,BOD5 under 5 mg/L, turbidity lower than 0.65 NTU, and colour less than 30 DT, and met with the reuse water standard of China. The removal rates of COD, BOD5, colour, and turbidity were 92.4%, 98.4%, 74% and 98.9%, respectively. Constant-flux operation mode was carried out in this study, and backwash was effective for reducing membrane fouling and maintaining constant flux. Membrane fouling had heavy impact on energy consumption. More attention should be paid on pipe selection and design for the sidestream MBR system, too.     

厌氧反应器与好氧MBR组合工艺处理毛纺印染废水试验研究

采用厌氧反应器与膜生物反应器(MBR)组合工艺处理毛纺印染废水,结果表明,当进水COD、BOD₅和色度分别为128～321 mg/L、36～95 mg/L和40～70倍时,出水COD、BOD₅、色度、浊度的平均值分别为36.9 mg/L、3.7 mg/L、21倍、0.24 NTU,平均去除率分别达到80.3%%、95%、59%、99.3%,达到生活杂用水水质标准.在本研究中,开发了一种新型的利用生物反应器内液位水头重力驱动连续出水的重力出流式膜生物反应器.在保留MBR处理效率高等优点的同时,省去传统的一体式MBR出水抽吸泵及复杂的反冲洗设备.整个系统结构紧凑,投资少,操作简便.选择合适的曝气量有助于提高膜通量,且可降低膜阻力的上升速率,有利于膜污染的控制.     

UASB-膜生物反应器处理抗生素废水的研究

采用UASB-膜生物反应器对抗生素废水进行处理研究。结果表明,UASB具有很强的抗冲击能力,当UASB和膜生物反应器的容积负荷分别为10.9kgCOD/m3·d和4.62kgCOD/m3·d时,系统COD去除率仍有96.47%。污泥浓度对膜生物反应器的COD去除率有较大影响,当MLSS保持在3000～4000mg/L时,膜生物反应器COD去除率为85%左右,高于MLSS保持在7500～7800mg/L时为68%左右。在不排泥运行时膜生物反应器中MLVSS和MLSS比值比排泥运行时低。     

气升循环分体式膜生物反应器再生回用厕所污水的研究

研究了分体浸没式膜生物反应器及其应用于厕所污水的再生回用.试验结果表明,在人水浓度COD440～970mg/L、BOD₅ 307～612mg/L、NH₃-N59～111mg/L的情况下,出水水质稳定,平均COD＜47mg/L、BOD₅＜8.5mg/L、NH₃-N＜20mg/L,处理水质达到建设部颁布的生活杂用水回用标准.研究了动力学参数污泥负荷、容积负荷和HRT对出水COD的影响,确定本试验较佳的污泥负荷和容积负荷分别为0.1kg/(kg·d)和1kg/(m³·d),HRT为7～8h.本文对污泥浓度、温度和产水时间与间歇时间比对膜通量的影响进行了测定与探讨.     

平板膜MBR处理生活污水试验研究

采用平板膜MBR工艺处理小区生活污水,研究了MBR工艺对COD、BOD、NH4+-N、SS及浊度等去除效果,在进水COD、BOD平均浓度为325mg/L、274mg/L的情况下,出水达到20mg/L和8mg/L,去除率在93%以上,SS及浊度去除率达到100%和98%,NH4+-N去除率79%,出水NH4+-N小于10mg/L。通过研究系统三氮转化可知,该系统没有发生反硝化反应,出水NO2--N和NO3--N浓度较高。通过投加葡萄糖人为改变容积负荷,在容积负荷变化3.2kgCOD/m·3d情况下,系统受负荷冲击影响较小,COD去除率仍能保持在88%以上。通过对膜通量的研究发现,膜通量在连续运行的前3天变化不大,第3天后,膜通量迅速降低,第10天后膜污染达到极限,因此清洗周期设定为3～4天。     

Test of membrane bioreactor for waste water treatment in a petrochemical complex

Membrane bioreactor (MBR) used in water and waste water treatment is a developing technique for water pollution control and water reuse. This paper describes a membrane-bioreactor for treatment of waste water in a petrochemical complex. The experimental MBR was a lab scale one composed of an activated sludge bioreactor unit and an ultrafiltration membrane unit. The relationship of COD removal with MLSS and HRT in this MBR was studied. The effects of crossflow velocity, backwash interval and volume of flush liquid on the flux were discussed. The results showed that average removal of COD, oil, SS and turbidity in petrochemical waste water by the MBR was 91%, 86%, 92% and 99% respectively. The average removal of NH3-N and total phosphorous was 85% and 82%. A coefficient of COD removal, k, was 0.017-0.080 L/(mg.d). The membrane flux maintained higher than 60 L/hm2 bar for 34 days without chemical cleaning when the velocity of crossflow was 3.5-3.9 m/s and the backwash interval was 30 minutes and backwash duration at 20 seconds. The results indicated that it is feasible for MBR technology to be used in petrochemical waste water treatment. The treated water could be considered as a source used to make up water for industrial cooling system or to be reused for other purposes.     

Test of membrane bioreactor for waste water treatment in a petrochemical complex

Membrane bioreactor (MBR) used in water and waste water treatment is a developing technique for water pollution control and water reuse. This paper describes a membrane-bioreactor for treatment of waste water in a petrochemical complex. The experimental MBR was a lab scale one composed of an activated sludge bioreactor unit and an ultrafiltration membrane unit. The relationship of COD removal with MLSS and HRT in this MBR was studied. The effects of crossflow velocity, backwash interval and volume of flush liquid on the flux were discussed. The results showed that average removal of COD, oil, SS and turbidity in petrochemical waste water by the MBR was 91%, 86%, 92% and 99% respectively. The average removal of NH₃-N and total phosphorous was 85% and 82%. A coefficient of COD removal, k, was 0.017-0.080 L/(mg.d). The membrane flux maintained higher than 60 L/hm2 bar for 34 days without chemical cleaning when the velocity of crossflow was 3.5-3.9 m/s and the backwash interval was 30 minutes and backwash duration at 20 seconds. The results indicated that it is feasible for MBR technology to be used in petrochemical waste water treatment. The treated water could be considered as a source used to make up water for industrial cooling system or to be reused for other purposes.     

膜生物膜工艺处理含盐工业废水

采用了膜生物膜工艺处理含盐羧甲基纤维素生产废水。接种污泥为普通污泥,经驯化使其适应含盐废水,在污泥驯化阶段,生物膜表现出极佳的盐度冲击后恢复能力。通过较长的水力停留时间(5～15 d)和较低的COD有机负荷(平均1.6 kg/(m3·d)左右),生物膜COD去除率基本达90%。膜池内,悬浮固体浓度基本保持在5 000 mg/L以内;通过聚偏氟乙烯中空纤维膜过滤,出水悬浮固体浓度保持在5 mg/L以内。膜污染可通过重复的气水反洗和定期的化学清洗得以缓解。     

膜生物反应器处理高浓度含酚废水研究

将膜生物反应器(MBR)用于高浓度含酚废水的处理中,探讨了进水中苯酚浓度、水力停留时间和污泥浓度对膜生物反应器处理含酚废水效果的影响。实验结果表明:经过42d驯化后,可以在高浓度含酚废水中正常运行,MBR系统对COD和氨氮的去除率分别可达98%和80.6%。当苯酚浓度为134mg/L时,处理的最佳水力停留时间为3h,最佳污泥浓度(MLSS)为7367mg/L。     

好氧颗粒污泥膜生物反应器的运行特性

以人工合成模拟废水对好氧颗粒污泥膜生物反应器(MBR)的运行特性和膜污染进行了研究.结果表明:在HRT为6h,溶氧浓度为4～6mg.L^-1,COD的容积负荷为7.24kg·(m³·d)^-1的条件下,COD的去除率可达96%以上.当NH₃-N的容积负荷为0.17kg·(m³·d)^-1时,NH₃-N的去除率可达60%.COD/N比的变化,对好氧颗粒污泥MBR的COD及NH₃-N去除率基本没有影响.稳定运行过程时,MBR中好氧颗粒污泥浓度(MLSS)基本维持在14～16mg·L^-1.较高的污泥浓度和颗粒污泥内部缺氧和厌氧环境的存在,使MBR中硝化和反硝化过程能同时存在.同时,比较了2种不同形态的活性污泥(颗粒污泥和絮状污泥)在MBR运行过程中膜通量的变化趋势,结果表明,颗粒污泥MBR膜通量的下降速度明显比絮状污泥MBR的下降速度慢很多,且通过空气反冲或用水清洗即可使通量基本恢复.     

污泥浓缩过程下膜生物反应器的生物特性与膜渗透性评估

采用中试规模的好氧膜生物反应器(MBR)工艺处理城市污水,考查了在浓缩过程下膜生物反应器的生物特性对膜渗透性及渗透性恢复的的影响.在试验中通过投加蔗糖溶液使系统维持恒定污泥负荷(food to microorganisms, F/M)在0.13,测定了活性污泥的一系列的生化与理化参数,并通过SPSS软件对污泥性质与动态变化的膜渗透性及渗透性恢复水平的相关性做了进一步的评估.结果表明,混合液悬浮固体(MLSS)浓度对膜渗透性的影响最大(rp=-0.958,P=0.000);溶解性微生物产物(SMP)浓度、溶解性化学需氧量(sCOD)浓度、污泥粒径(PSD)及毛细吸水时间(CST)对膜渗透性的影响属于同一个水平(|rp|=0.82~0.85,P=0.000);而污泥沉降性能与丝状菌指数对膜渗透性的影响不大.并且发现随着MLSS浓度的增大,膜丝廊道内积累的堵塞固体(ACS)的质量以及膜渗透性的绝对恢复量(ΔL)也有增加的趋势,表明MLSS浓度直接影响着膜生物反应器的堵塞性能,也进一步证明了膜堵塞是除膜污染之外影响膜渗透性的另一个重要因素.在低通量[5~6L/(m2·h)] 的操作条件下离线清堵联合强化化学反洗(CEB)的方式可以保证膜生物反应器工艺在高MLSS浓度运行下实现膜渗透性的可持续恢复.     

Inorganic nitrogen removal of toilet wastewater with an airlift external circulation membrane bioreactor

Removal of inorganic nitrogen (inorganic-N) from toilet wastewater, using a pilot-scale airlift external circulation membrane bioreactor (AEC-MBR) was studied. The results showed that the use of AEC-MBR with limited addition of alkaline reagents and volumetric loading rates of inorganic-N of 0.19-0.40 kg inorganic-N/(m3·d) helped achieve the desired nitrification and denitrification. Furthermore, the effects of pH and dissolved oxygen (DO) on inorganic-N removal were examined. Under the condition of MLSS at 1.56-2.35 g/L, BOD5/ammonia nitrogen (NH/-N) at 1.0, pH at 7.0-7.5, and DO at 1.0-2.0 mg/L, the removal efficiencies of NH4 -N and inorganic-N were 91.5% and 70.0%, respectively, in the AEC-MBR. The cost of addition of alkaline reagent was approximately 0.5-1.5 RMB yuan/m3, and the energy consumption was approximately 0.72 kWh/m3 at the flux of 8 L/(m2·h).     

一体式膜生物反应器污水资源化技术研究

膜生物反应器是高效的污水处理工艺,但其高气水比运行条件产生的动力消耗与国外膜组件昂贵的价格成为膜生物反应器在我国应用的主要限制因素。为此本研究采用分体曝气形式,选择国产高抗污性能PVDF中空纤维膜,设计了间歇式膜生物反应器,研究了污泥浓度、曝气量和水力停留时间对一体式膜生物反应器去除污染物效果的影响。在低气水比条件下,MBR处理生活污水的研究表明,出水COD<50mg/L,BOD<10mg/L,NH3—N<20mg/L,浊度<3NTU,悬浮固体浓度为零,优于生活杂用水水质标准(CJ25.1-89)。     

基因工程菌生物强化MBR工艺处理阿特拉津试验研究

以生活污水为共基质,考察了基因工程菌在MBR和活性污泥反应器中对阿特拉津的生物强化处理效果,以及生物强化处理对污泥性状的影响.结果表明,基因工程菌在MBR中对阿特拉津具有很好的生物强化处理效果,阿特拉津平均出水浓度为0.84 mg/L,平均去除率为95%,最大去除负荷可以达到70 mg/(L·d).生物强化的MBR对生活污水中COD的平均去除率为71%,COD平均出水浓度65 mg/L,COD容积负荷增加对COD去除效果有一定影响;对生活污水中的氨氮具有很好的去除效果,氨氮平均出水浓度为1.1 mg/L,平均去除率为97%,最大氨氮去除负荷为143 mg/(L·d).与普通MBR污泥相比,生物强化MBR污泥的硝化活性和亚硝化活性略高,碳氧化活性略低,因此表现出氨氮处理效果很好,COD处理效果略差.阿特拉津的存在会对污泥性状产生影响,可能是造成污泥碳氧化活性低的原因.     

膜生物反应器组合工艺处理PTA废水的研究

采用膜生物反应器为核心的组合工艺对PTA废水进行处理,考察了组合工艺的处理效果。结果表明,该工艺对PTA废水有较好的处理效果,系统抗负荷冲击性强,出水水质好。在有机负荷为3.55kgCOD/m3d时,系统出水CODcr稳定在120mg/L以下,COD去除率高达95%以上。同时构建了MBR系统有机底物降解动力学模型,并对其进行了分析。     

两种膜生物反应器处理印染废水的对比试验研究

针对印染废水成分复杂、色度大、浓度高且生物难降解物质多等特点,采用了混凝沉淀法对印染废水进行预处理,而后分别采用新型海藻式膜生物反应器(MBR)和传统帘式膜生物反应器对印染废水进行活性污泥法处理试验研究。通过对化学需氧量(COD)、生化需氧量(BOD)、氨氮(NH3-N)、总氮(TN)、总磷(TP)、色度、浊度等水质指标连续进行测定、分析与处理,考察两种膜生物反应器对印染废水的降解效果,并观察系统运行情况和膜组件污染状况。试验结果表明:海藻式MBR对印染废水的处理效果良好,出水浊度低于0.3NTU,对COD、BOD、色度、氨氮、总氮的去除率分别可达90%、94%、91.4%、87.8%、86.4%。海藻式MBR在各项指标上均明显优于传统帘式MBR,且能够降低MBR膜丝根部的污染,清洗更方便、更有效。     

内循环生物流化床处理石化废水的中试研究

进行了内循环生物流化床处理石化废水的中试研究,当进水平均ＣＯＤ为８００ｍｇ／Ｌ,流化床出水再辅这以气浮后处理,ＣＯＤ可降至２００ｍｇ／Ｌ,当进水ＣＯＤ为５００ｍｇ／Ｌ时,ＣＯＤ可达１００ｍｇ／Ｌ,本试验中的ＣＯＤ去除容积负荷可达１５ｋｇ／（ｍ＾３·ｄ）以上。     

一种垃圾渗滤液的处理技术

本文采用厌氧反应器UASB+膜生物反应器MBR+纳滤工艺处理垃圾填埋场废水,设计处理能力为100m3/d,在进水CODs:和BODs分别为10 000 mg/L和5 000 mg/L时,经处理后,出水CODc:和BODs分别为60mg/L和20mg/L,其去除率分别为99.4%和99.6%,且出水稳定,达到了<北京市水...