Application of A2O moving-bed biofilm reactors for textile dyeing wastewater treatment

A three-stage pilot-scale moving-bed biofilm reactor (MBBRs, anaerobic-anaerobic-aerobic in series) was investigated to treat textile dyeing wastewater. Each reactor was filled with 20% (v/v) of polyurethane-activated carbon (PU-AC) carrier for biological treatment. To determine the optimum operating conditions of MBBRs, the effect of PUAC carrier, its packing percentage (v/v%) and pH control on COD removal were analyzed by batch experiments. The MBBRs were inoculated with activated sludge obtained from a local dyeing wastewater treatment plant. The MBBR process removed 86% of COD and 50% of color (influent COD=608 mg/L and color=553 PtCo unit) using relatively low MLSS concentration (average 3,000 mg/L in biomass attached to PU-AC carrier) and hydraulic retention time (HRT=44 hr). The MBBR process showed a promising potential for dyeing wastewater treatment.     

挡板式水解酸化法处理印染废水的中试试验研究

对印染废水进行了挡板式水解酸化中试试验。结果表明,调节原水pH值为10左右,污泥质量浓度为20g/L,水力停留时间为9～10h的条件下,处理后的废水COD去除率平均为38．6％,进出水的BOD／COD比值由0．285升高至0．447,废水可生化性能得到明显改善。挡板式水解酸化法作为印染废水好氧生物处理的前处理在技术上和经济上都是可行的。     

臭氧氧化法强化处理纤维素乙醇废水研究

为提高纤维素乙醇废水厌氧出水的可生化性,采用臭氧氧化法对其进行强化处理,考察了反应时间、臭氧投加量、初始p H及反应温度对纤维素乙醇废水可生化性、COD和氨氮去除效果的影响。结果表明,在初始pH为8~10,臭氧投加量为5 g/h,反应时间为80 min,反应温度为30℃的最优条件下,出水COD为1 450 mg/L左右,COD去除率稳定在35%左右;出水氨氮为220 mg/L左右,氨氮去除率稳定在40%以上,出水BOD_5/COD由0.1提高到0.3左右,废水的可生化性得到较大程度的提高。     

Anaerobic/aerobic sequential treatment of a cotton textile mill wastewater

The treatment of a wastewater taken from a cotton textile mill was investigated using an anaerobic/aerobic sequential system during an operational period of 87 days. The process units consisted of an upflow anaerobic sludge blanket (UASB) reactor and a continuous stirred tank reactor (CSTR). Wastewater characterization was performed before feeding the reactor system. Glucose‐COD, and azo dyes were added to the textile wastewater for comparative purposes in the final period of operation. The pH values in the effluent of the UASB reactor were suitable for optimal anaerobic treatment in all runs. The biodegradable part of the COD in wastewater was removed effectively, with the anaerobic stage improving the biodegradability of wastewater entering the aerobic stage. The UASB reactor permitted COD and color removals of 9–51% and 46–55%, respectively, at a hydraulic retention time (HRT) of 30 h. COD removal efficiencies were between 40 and 85% and color removal efficiencies were 39–81% in normal and artificially‐colored wastewaters at a total HRT of 5.75 days in the UASB/CSTR reactor system. Benzidine produced from the cleavage of azo bond in the anaerobic stage was effectively removed in the aerobic stage, and was identified by comparison of its HPLC spectrum with that of an authentic specimen. Copyright © 2004 Society of Chemical Industry     

臭氧-膜生物反应器深度处理印染废水的研究

采用臭氧-膜生物反应器工艺深度处理达标排放印染废水。研究结果表明:在O3与COD的质量比为0.06,MBR停留时间为4h的条件下,经臭氧氧化后废水的可生化性大幅提升,BOD5与COD的质量比从0.19上升到0.42,废水COD的质量浓度从100mg/L降至25mg/L,色度从35倍降至15倍以下。直接运行费用0.45元/t。     

HABR-CASS组合工艺处理棉机织物印染废水的研究

采用HABR-CASS组合工艺进行棉机织物印染废水处理的中试研究.结果表明,在HABR厌氧池、CASS反应池的水力停留时间分别为24、12 h的条件下,系统对CODCr、BOD5、氨氮、SS的总去除率分别为90.4%、95.5%、87.0%、87.5%,各污染物出水平均质量浓度分别为67.5、13.8、6.9、38.0...     

A/O生物流化床--混凝工艺处理酵母废水试验研究

针对酵母废水高浓度、高色度、成分复杂、难处理的特点,采用厌氧--好氧生物流化床结合混凝工艺处理该废水,对生物流化床的启动和负荷运行、混凝以及处理过程中色度的变化进行了探讨,结果表明,当进水COD质量浓度约8 000mg/L,色度为3 200倍左右,厌氧和好氧HRT分别为24、6.5 h,混凝剂聚合硫酸铁质量浓度为3g/L时,出水COD＜300mg/L,色度＜180倍.     

印染废水厌氧水解过程挥发性脂肪酸的产生及影响因素

针对印染废水普遍存在的B/C较低、脱氮优质碳源不足等问题,研究了水力停留时间（HRT）及温度对印染废水厌氧水解过程中挥发性脂肪酸产生量及组成成分的影响。结果表明对于染色废水,最佳厌氧HRT为15 h,VFAs浓度可达到472.1 mg/L,乙酸浓度占VFAs浓度的86.5%,其中相对于低温,中温厌氧更易于VFAs的产生,但温度的改变对于VFAs的组分影响较小。对于前处理废水,最佳厌氧HRT为60 h,出水VFAs浓度可达到692.4 mg/L。合理浓度的VFAs产生可以为后续反硝化单元提供优质的碳源,为印染废水总氮的削减奠定基础。     

水解酸化—好氧MBBR耦合Fenton法处理抗生素废水研究

采用水解酸化—好氧移动床生物膜(MBBR)串联Fenton工艺处理抗生素废水,探讨了pH、HRT等对水解酸化以及Fe2 浓度和H2O2投加量对Fenton工艺的影响。实验结果表明,对于COD为6800.62mg/L、B/C<0.3的抗生素废水,当水解段pH和HRT分别为6.5和12h时,挥发酸(VFA)质量浓度为931.75mg/L,COD去除率为26.59%,此时水解酸化—好氧段出水COD为1229.80mg/L,COD总去除率为81.92%。再经Fenton工艺深度处理,当Fe2 最佳投加质量浓度为240mg/L,H2O2投加量为3.19mL/L时,总COD去除率可达97.38%,最终出水COD为178.50mg/L,达到制药工业废水排放标准。     

桉木 P-RC APMP 废水的污染特征和生物处理研究

对桉木P-RC APMP废水进行了污染特征的全面分析,每产1吨桉木 P-RC APMP浆,耗水 26.7 m³,排出COD 114.8 kg,BOD 35.7 kg,SS 42.1 kg。厌氧处理在COD体积负荷 5 g/(L·d) 时,可使桉木P-RC APMP废水的COD去除 61.3%;好氧处理在HRT 24 h 时,可使桉木P-RC APMP废水的COD去除 73.7%。生物处理后的桉木P-RC APMP废水,经初步的混凝处理很容易达到国家排放标准GB 3544-2001。经深度的混凝处理,则可使COD降到 200 mg/L以下,SS 降到 60 mg/L 以下,达到更高的环保要求。     

水性工业涂料废液的处理研究

采用混凝-生物接触氧化-芬顿高级氧化组合工艺对水性涂料废液进行处理研究.重点考察了该工艺对涂料废液COD、氨氮和SS的去除效果.结果表明,pH升高对涂料废液中的SS、COD有去除效果并且能够避免混凝时发生板结,当pH为10时,COD由148 000 mg/L降至46 000 mg/L,SS质量浓度由18 500 mg/...     

混凝-厌氧水解-好氧组合工艺处理印染废水的研究

印染废水的色度大,有机物含量高,可生化性差。针对上述特点,采用了混凝一厌氧水解一好氧组合工艺处理印染废水。结果表明,该工艺对印染废水有很好的处理效果,最终出水CODCr为83～124mg／L,出水基本达到无色,达到纺织染整工业水污染物排放一级标准(GB4287-1992),处理成本为1．5元／t。     

厌氧MBBR处理生活污水的特性研究

采用厌氧移动床生物膜反应器处理城市生活污水,研究了HRT、pH值、容积负荷、水温等对工艺运行效果的影响,并进行了厌氧MBBR与SBR联用试验及回用分析.结果表明,在HRT为4 h,进水CODCr的质量浓度为300mg/L左右,氨氮的质量浓度为15 mg/L左右,50%的填料填充率,pH值为7左右的条件下,厌氧MBBR出...     

水溶性胶黏剂生产废水处理工程实例

针对水溶性胶黏剂生产废水有机物含量较高、水质波动大、难生物降解等特点,采用Fenton氧化+混凝沉淀+UASB+生物滤池的组合工艺对其进行处理。运行结果表明,系统运行稳定,出水COD≤500 mg/L,氨氮≤25 mg/L,SS≤400 mg/L,处理出水达到《污水综合排放标准》(GB 8978-1996)的三级标准,COD、氨氮、SS去除率分别为93.6%、56.9%、89.5%,工艺处理成本为6.8元/m^3。     

Toxicity and Biodegradability Behavior of Xenobiotic Chemicals Before and After Ozonation: A Case Study with Commercial Textile Tannins

Ozonation of a natural tannin (NT; COD_o?=?1195 mg/L; TOC_o?=?342 mg/L; BOD_5,o?=?86 mg/L) and a synthetic tannin ST; COD_o?=?465 mg/L; TOC_o?=?55 mg/L; BOD_5,o?=?6 mg/L) being frequently applied in the polyamide dyeing process was investigated. Synthetic wastewater samples containing these tannins individually were prepared and subjected to ozonation at varying ozone doses (625– 1250 mgO₃/L wastewater), at pH?=?3.5 (the application pH of tannins) and pH?=?7.0 at an ozone dose of 1125 mgO₃/L wastewater. The collective environmental parameters COD, TOC, BOD₅, UV₂₅₄ and UV₂₈₀ (UV absorbance at 254 nm and 280 nm, representing aromatic and unsaturated moieties, respectively) were followed during ozonation. Changes in the biodegradability of the tannins were evaluated in terms of BOD₅ measurements conducted before and after ozonation. In addition, activated sludge inhibition tests employing heterotrophic biomass were run to elucidate the inhibitory effect of raw and ozonated textile tannins towards activated sludge biomass. Partial oxidation (45% COD removal at an ozone dose of 750 mg O₃/L wastewater and pH?=?3.5) of ST was sufficient to achieve elimination of its inhibitory effect towards heterotrophic biomass and acceptable biodegradability improvement, whereas the inhibitory effect and biodegradability of NT could not be reduced via ozonation under the same reaction conditions.     

已内酰胺生产工艺废水深度处理试验研究

采用流化床生物膜反应器（MBBR）→臭氧接触池→曝气生物滤池（BAF）→砂滤→超滤→反渗透组合工艺处理已内酰胺生产废水,并开展了现场中试试验。中试结果表明,已内酰胺废水经上述组合工艺处理后,产水COD浓度在5mg／L以下,电导率稳定保持在60gs／cm以下,水质符合回用水质要求。     

混凝沉淀—两级生化工艺处理印染废水

印染废水是当前难以处理的工业废水之一,其悬浮物、COD及色度等均较高。介绍了采用混凝沉淀—两级生化工艺处理印染废水的工程设计及运行效果。在进水COD、BOD5、色度、SS分别为2 136、542 mg/L、480倍、400mg/L的情况下,出水COD、BOD5、色度、SS分别为78、18 mg/L、40倍、46 mg/L,满足GB 4287—2012排放要求。     

厌氧水解-好氧-吸附工艺处理印染废水

采用厌氧水解-好氧-硅藻土吸附工艺对某印染废水进行处理实验,结果表明:COD总去除率达87.6%,色度总去除率达98%,出水水质达到了<纺织染整工业水污染物排放标准>(GB 4287-1992)-级排放标准要求.在给定条件下进行厌氧和好氧处理.并分别确定厌氧和好氧处理最佳反应时间为8～10 h和6～8 h;硅藻土在去除色度上效果显著,同时具有去除COD的能力,当硅藻土投加质量浓度≥5.0 g/L时,可使印染废水出水的色度和COD达到一级排放标准要求;若色度和COD指标仅需同时满足二级排放标准要求时,硅藻土投加质量浓度为2.0 g/L.     

臭氧-水解酸化-BAF深度处理燃料乙醇废水

采用臭氧-水解酸化-内循环BAF组合工艺深度处理燃料乙醇企业二级生化出水,考察了臭氧氧化时间、臭氧投加速率、生化处理单元HRT对废水COD、NH3-N、色度去除率的影响。结果表明:当进水COD为230~270mg/L,NH3-N为9.7~10.9 mg/L,色度为80~124倍时,在臭氧氧化时间为30 min,臭氧投加速率为1.40 g/h,水解酸化池和内循环BAF反应器HRT均为4 h的条件下,出水COD、NH3-N分别为45.9、3.13 mg/L,色度4倍,达到了《污水综合排放标准》(GB 8978—1996)一级排放标准的要求。     

水力停留时间对改良型AAO-MBR工艺处理夏季农村生活污水的影响

水力停留时间(HRT)是影响AAO工艺脱氮除磷效率的重要因素.采用改良型AAO-MBR工艺处理某农村生活污水,考察了夏季时HRT对处理装置出水效果的影响.试验结果表明,该工艺对低浓度农村生活污水中CODCr、氨氮的去除效果较稳定,平均去除率分别为69.50％、98.90％.TN去除率为26.50％～56.60％,随厌氧...