生物接触氧化法处理城镇污水技术经济分析

本文论述生物接触氧化法处理城镇污水的技术经济效益及使用不同填料的性能测试比较。     

生物接触氧化法处理生活污水工程实例

介绍了重庆市某体育馆生活污水处理厂的工艺流程,各构筑物和主要设备的参数,指出该工艺采用生物接触氧化法处理生活污水,具有机械设备少、投资省、脱N除P、工程设施采用地下埋入式,不影响周围环境的特点,且出水水质能达到GB 8978-1996污水综合排放标准的要求。     

生物接触氧化工艺处理洗浴污水并回用

云南铝业股份有限公司与高原湖泊阳宗海毗邻,其生产废水及生活污水不能外排,需处理后全部回用.该公司污水主要为洗浴污水(占60%以上),基于需要分别建设了一、二期污水处理工程,处理规模均为60 m<'3>/h,采用生物接触氧化/斜管沉淀/重力式无阀滤池过滤/消毒处理工艺.介绍了该公司一期污水处理工程的设计特点及运行效果.一期污水处理设施自2001年运行以来,处理效果稳定,处理出水全部回用作绿化用水、循环冷却水,每年节约水资源量为52.56×10<'4>m<'3>,节约自来水费为199.728万7L/a,取得了良好的经济效益和环境效益.     

生物接触氧化法处理废塑料拆解综合污水

采用生物接触氧化工艺处理废塑料拆解综合污水,设计能力为2000 m3/d,实际运行结果表明,该工艺对COD、BOD,、SS、NH3-N和石油类的总去除率分别达到87.84%、94.75%、93.93%、72.82%、99.74%,出水水质已达到广东省<水污染物排放标准>(DB 44/26-2001)的一级标准,污水处理成本为0.60元/m3.     

地埋式一体化生物接触氧化工艺处理变电站生活污水

江西某变电站污水处理必须与周围环境相协调,采用地埋式一体化生物接触氧化工艺,出水水质达到《污水综合排放标准》(GB 8978—1996)的一级标准,具有运行稳定可靠、管理要求不高、运行费用低、污泥产量少、不占用变电站用地、不产生臭味及噪声等优点,值得推广应用。     

生物接触氧化反应器处理农村生活污水的能源配置优化研究

将太阳能光伏发电系统和生物接触氧化反应器相结合,利用太阳能直接给反应器曝气系统提供动力支持,根据农村生活污水排放特点设置4种曝气模式,其中每天曝气8 h效果最优。太阳能光伏发电系统的配置成本较其他模式可缩减48.7%。生物接触氧化反应器在最优曝气模式下稳定运行,出水COD、NH3-N、TN和TP质量浓度均达到《城镇污水处理厂污染物排放标准》二级排放标准。     

水解酸化—生物接触氧化工艺处理小区污水

某城市居民小区污水处理站设计规模为 1 0 0m3/d ,采用水解酸化—生物接触氧化工艺 ,在进水BOD为 86mg/L、COD为 2 1 5mg/L、SS为 1 1 6mg/L、NH3-N为 2 8mg/L的条件下 ,处理后出水BOD <2 0mg/L、COD <60mg/L、SS<2 0mg/L、NH3-N <1 5mg/L ,达到《污水综合排放标准》(GB8978-1 996)一级标准     

地埋式生物接触氧化工艺在乡镇污水处理厂的应用

介绍了地埋式生物接触氧化工艺特点,镇江市新区姚桥污水处理厂采用地埋式一体化缺氧+生物接触氧化工艺,出水达到GB 18918-2002《城镇污水处理厂污染物排放标准》的一级A标准,具有占地少、污泥产量少、运行稳定可靠等优点。     

二段生物接触氧化法处理城市污水

安阳聂村污水处理厂的运行实践表明，二段生物接触氧化法具有抗冲击负荷、容积负荷高、气水比低、运行管理简便等工艺特点，可推广应用。     

生物接触氧化/垂直流人工湿地处理城市生活污水

采用生物接触氧化和复合垂直流人工湿地的组合工艺处理城市生活污水,考察了对主要污染指标的去除效果.结果表明:与不曝气和连续曝气相比,在间歇曝气条件下,组合工艺对COD和氮的去除率较高.在进水负荷为0.8m3/(m2·d)、水力停留时间为1d、曝气量为4.038m3/(m2·d)、曝气/停曝周期为20 min/60 min的条件下,组合工艺对COD、NH4+-N、TN的去除率分别为80.37％、98.32％、80.22％,出水COD、NH4+-N、TN浓度均达到了《城镇污水处理厂污染物排放标准》(GB 18918-2002)的一级A标准.     

生物絮凝吸附+生物接触氧化除氮机理探讨

通过单因素试验研究了生物絮凝吸附＋生物接触氧化组合式一体化工艺对城市污水悬浮物SS、化学需氧量COD、氨氮NH3-N、总氮TN、总磷TP的去除效能和机理。试验结果表明：在组合工艺的较优运行条件下,装置对SS、COD、NH3-N、TN、TP的平均去除率分别为88.7%、89.3%、87.9%、73.4%、58.8%,可以使除磷外的所有指标达到《城镇污水处理厂污染物排放标准》（GB18918-2002）中的一级B标准。其中生物絮凝吸附段对总氮的去除率为52.7%,生物接触氧化段对总氮的去除率为43.9%,本文即是对装置除氮机理的探讨。     

Advanced treatment of biologically pretreated coking wastewater by electrochemical oxidation using boron-doped diamond electrodes

Electrochemical oxidation is a promising technology to treatment of bio-refractory wastewater. Coking wastewater contains high concentration of refractory and toxic compounds and the water quality usually cannot meet the discharge standards after conventional biological treatment processes. This paper initially investigated the electrochemical oxidation using boron-doped diamond (BDD) anode for advanced treatment of coking wastewater. Under the experimental conditions (current density 20-60 mA cm⁻², pH 3-11, and temperature 20-60 °C) using BDD anode, complete mineralization of organic pollutants was almost achieved, and surplus ammonia-nitrogen (NH₃-N) was further removed thoroughly when pH was not adjusted or at alkaline value. Moreover, the TOC and NH₃-N removal rates in BDD anode cell were much greater than those in other common anode systems such as SnO₂ and PbO₂ anodes cells. Given the same target to meet the National Discharge Standard of China, the energy consumption of 64 kWh kgCOD⁻¹ observed in BDD anode system was only about 60% as much as those observed in SnO₂ and PbO₂ anode systems. Further investigation revealed that, in BDD anode cell, organic pollutants were mainly degraded by reaction with free hydroxyl radicals and electrogenerated oxidants (S₂O₈²⁻, H₂O₂, and other oxidants) played a less important role, while direct electrochemical oxidation and indirect electrochemical oxidation mediated by active chlorine can be negligible. These results showed great potential of BDD anode system in engineering application as a final treatment of coking wastewater.     

高级催化氧化法处理高含盐废水研究

针对风城油田生产废水高盐、高温、高矿化度、可生化性差等水质特性,现场采用“混凝沉降+高级催化氧化”工艺,处理后出水达到《污水综合排放标准》GB8978中二级排放标准。混凝沉降阶段COD去除率为36~49%,挥发酚去除率为11~21%,石油类去除率为42~69%;催化氧化阶段COD去除率为20%~40%,挥发酚去除率为69%~73%,石油类去除率为16%~20%。     

Biodegradability enhancement of a pesticide-containing bio-treated wastewater using a solar photo-Fenton treatment step followed by a biological oxidation process

This work proposes an efficient combined treatment for the decontamination of a pesticide-containing wastewater resulting from phytopharmaceutical plastic containers washing, presenting a moderate organic load (COD = 1662-1960 mg O₂ L⁻¹; DOC = 513-696 mg C L⁻¹), with a high biodegradable organic carbon fraction (81%; BOD₅ = 1350-1600 mg O₂ L⁻¹) and a remaining recalcitrant organic carbon mainly due to pesticides. Nineteen pesticides were quantified by LC-MS/MS at concentrations between 0.02 and 45 mg L⁻¹ (14-19% of DOC). The decontamination strategy involved a sequential three-step treatment: (a) biological oxidation process, leading to almost complete removal of the biodegradable organic carbon fraction; (b) solar photo-Fenton process using CPCs, enhancing the bio-treated wastewater biodegradability, mainly due to pesticides degradation into low-molecular-weight carboxylate anions; (c) and a final polishing step to remove the residual biodegradable organic carbon, using a biological oxidation process. Treatment performance was evaluated in terms of mineralization degree (DOC), pesticides content (LC-MS/MS), inorganic ions and low-molecular-weight carboxylate anions (IC) concentrations. The estimated phototreatment energy necessary to reach a biodegradable wastewater, considering pesticides and low-molecular-weight carboxylate anions concentrations, Zahn-Wellens test and BOD₅/COD ratio, was only 2.3 kJ_UV L⁻¹ (45 min of photo-Fenton at a constant solar UV power of 30 W m⁻²), consuming 16 mM of H₂O₂, which pointed to 52% mineralization and an abatement higher than 86% for 18 pesticides. The biological oxidation/solar photo-Fenton/biological oxidation treatment system achieved pesticide removals below the respective detection limits and 79% mineralization, leading to a COD value lower than 150 mg O₂ L⁻¹, which is in agreement with Portuguese discharge limits regarding water bodies.     

Electrochemical sulfide oxidation from domestic wastewater using mixed metal-coated titanium electrodes

Hydrogen sulfide generation is a major issue in sewer management. A novel method based on electrochemical sulfide oxidation was recently shown to be highly effective for sulfide removal from synthetic and real sewage. Here, we compare the performance of five different mixed metal oxide (MMO) coated titanium electrode materials for the electrochemical removal of sulfide from domestic wastewater. All electrode materials performed similarly in terms of sulfide removal, removing 78 ± 5%, 77 ± 1%, 85 ± 4%, 84 ± 1%, and 83 ± 2% at a current density of 10 mA/cm² using Ta/Ir, Ru/Ir, Pt/Ir, SnO₂ and PbO₂, respectively. Elevated chloride concentrations, often observed in coastal areas, did not entail any significant difference in performance. Independent of the electrode material used, sulfide oxidation by in situ generated oxygen was the predominant reaction mechanism. Passivation of the electrode surface by deposition of elemental sulfur did not occur. However, scaling was observed in the cathode compartment. This study shows that all the MMO coated titanium electrode materials studied are suitable anodic materials for sulfide removal from wastewater. Ta/Ir and Pt/Ir coated titanium electrodes seem the most suitable electrodes since they possess the lowest overpotential for oxygen evolution, are stable at low chloride concentration and are already used in full scale applications.     

奥贝尔氧化沟在县城污水厂的应用

某县污水厂采用奥贝尔氧化沟工艺,对工艺的运行情况进行了分析,通过混凝实验确定最佳投药量,投加絮凝剂,提高了出水效果,从而解决了出水不好的问题。     

光催化氧化预处理滆湖原水试验研究

对光催化氧化预处理微污染水源水进行了研究,选择聚丙烯塑料填料作为载体,掺杂了一定量的TiO2,探讨了紫外光强、停留时间、水温对有机物去除效果的影响,以及浊度的变化情况,得出了相应的试验结果。     

用物化和生化组合工艺处理印染废水的探讨

介绍了印染废水的来源、水质特点,概括介绍了物化—生化组合处理工艺的工艺流程,以及对原有工艺和现有工艺进行了分析和比较,提出了在印染废水处理中物化处理技术与其他技术组合使用更为经济有效。     

UASB＋生物接触氧化＋混凝沉淀法处理废水探讨

结合工程概况,根据设计进出水水质,通过调研及实验室小试后进行处理工艺的优化组合,确定了以“UASB＋生物接触氧化＋混凝沉淀法”的处理工艺,并详细对其处理工艺进行了介绍,指出该工艺具有操作简单、管理方便、投资省等优点,可在同类丝绸废水处理中推广使用。     

Heterogeneous catalytic wet peroxide oxidation systems for the treatment of an industrial pharmaceutical wastewater

The aim of this work was to assess the treatment of wastewater coming from a pharmaceutical plant through a continuous heterogeneous catalytic wet peroxide oxidation (CWPO) process using an Fe₂O₃/SBA-15 nanocomposite catalyst. This catalyst was preliminary tested in a batch stirred tank reactor (STR), to elucidate the influence of significant parameters on the oxidation system, such as temperature, initial oxidant concentration and initial pH of the reaction medium. In that case, a temperature of 80 °C using an initial oxidant concentration corresponding to twice the theoretical stoichiometric amount for complete carbon depletion and initial pH of ca. 3 allow TOC degradation of around 50% after 200 min of contact time. Thereafter, the powder catalyst was extruded with bentonite to prepare pellets that could be used in a fixed bed reactor (FBR). Results in the up-flow FBR indicate that the catalyst shows high activity in terms of TOC mineralization (ca. 60% under steady-state conditions), with an excellent use of the oxidant and high stability of the supported iron species. The activity of the catalyst is kept constant, at least, for 55 h of reaction. Furthermore, the BOD₅/COD ratio is increased from 0.20 to 0.30, whereas the average oxidation stage (AOS) changed from 0.70 to 2.35. These two parameters show a high oxidation degree of organic compounds in the outlet effluent, which enhances its biodegradability, and favours the possibility of a subsequent coupling with a conventional biological treatment.