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类型 基础研究 预答辩日期 2018-03-08
开始(开题)日期 2016-09-09 论文结束日期 2018-01-23
地点 四牌楼逸夫建筑馆1501 论文选题来源 其他项目    论文字数 5.43 (万字)
题目 电化学正渗透膜生物反应器 处理市政废水的研究
主题词 正渗透膜生物反应器,微生物燃料电池,废水处理,渗透性能,产电性能
摘要 水资源和能源短缺是当今世界面临的两大主要挑战。对于废水处理工艺而言,在去除污染物、获取清洁水的同时,回收废水中有机物所蕴含的能源,具有非常重大的意义。利用微生物燃料电池技术,能在胞外产电菌的作用下将有机废水中的化学能直接转化为电能。另外,作为膜分离技术的一个新的分支,正渗透这项新技术以低能耗、高效率、污染小、工艺简单、适应性强等众多优势正成为新的研究热点。本文将微生物燃料电池技术与正渗透膜分离技术相结合,构建电化学正渗透膜生物反应器;利用聚合电解质作为汲取液,正渗透膜为膜组件的核心,提高微生物燃料电池出水的水质和产电功率密度,并延缓正渗透膜组件的膜污染,降低污水处理的能耗,为污水处理提供新的节能途径。本论文研究工作分为五个部分:聚合电解质汲取液(聚丙烯酸钠,PAA-Na)的性能与回用方法探究、正渗透膜分离(FO)的运行特性研究、优化FO系统的运行特性研究、正渗透膜生物反应器(OMBR)的运行特性研究、电化学正渗透膜生物反应器(BES-OMBR)的渗透性能与产电效能评价。主要研究结果如下: pH显著影响汲取液PAA-Na在水溶液中的水力学直径,当高于响应pH时,PAA-Na呈聚合电解质溶液状态;当低于响应pH时,PAA-Na呈聚合体状态,因此响应pH直接影响着回收过程中酸碱使用量。使用调节pH 与微滤相结合的回收方法回收汲取液PAA-Na时,可以获得较高的回收效率,并使得损失的PAA-Na在回收水中的浓度很低(60~67 mg/L)。在使用25 wt% 2000 PAA-Na时达到最高回收效率99.99 %。 聚合电解质PAA-Na作为汲取液进行FO试验时,使用蒸馏水作为原料液,渗透通量随着浓度的升高而升高,随着分子量的升高而降低,最高渗透通量在使用25 wt% 2000 PAA-Na时达到18.0?±?0.5?LMH,此时的盐反渗透通量(RSF)为0.11?±?0.01?gMH,盐水反渗透比(JS/JW?)为6.1?±?0.3?mg/L,此时的运行费用为0.259?CNY/m3。? 聚合电解质PAA-Na作为汲取液进行浸没式FO试验时,使用蒸馏水作为原料液,系统可以持续在170-h内产生渗透通量,渗透通量随着浓度的升高而升高,最高渗透通量在使用30 wt% 2000 PAA-Na时达到14.5?LMH,此时的盐反渗透通量(RSF)为0.18?gMH,溶质在原料液侧的浓度为132 mg/L。 聚合电解质PAA-Na作为汲取液进行OMBR试验时,使用模拟废水作为原料液,系统可以持续在110-h内产生渗透通量,渗透通量随着浓度的升高而升高,所产生的最高渗透通量是在使用30 wt% 2000 PAA-Na时达到11.4?LMH,此时的盐反渗透通量(RSF)为0.18?gMH,此时溶质在原料液侧的浓度为43 mg/L, 总COD浓度为56 mg/L,汲取液在原料液中的最大降解速率为6 mg/(d·m3),总COD在原料液中的最大降解速率为63 mg/(d·m3);经过600-h的运行(五个循环),系统所产生的渗透通量仅下降1.3 %,原料液无TOC和氨氮的累积,整个运行过程去除COD的费用为2.121~4.354 CNY/kg COD。 聚合电解质PAA-Na作为汲取液进行BES-OMBR试验时,使用模拟废水作为原料液,系统能够产生稳定且较高的渗透通量和电流密度。渗透通量随着分子量的增加而降低,随着浓度的升高而升高,所产生的最高渗透通量在使用32 wt% 2000 PAA-Na时达到12.6?±?0.5?LMH,此时的盐反渗透通量(RSF)为0.05?±?0.00 gMH。 在BES-OMBR运行60-h后,最大渗透通量在5次回收过程中呈现下降的趋势,回收的汲取液比初始的汲取液所产生的渗透通量下降4.2~6.8%。运行过程由于不可避免的汲取液PAA损失(3~20?mg/L),最终出水COD为65~71?mg/L。在汲取液四次回收后,其高效的回收效率(99.36~99.87?%)使得汲取液PAA在回收水中的浓度很低(15~21 mg/L),且此时的运行费用为0.350 CNY/m3。 BES-OMBR系统所产生的电流密度与渗透通量的趋势相同,最高的电流密度能够在使用32 wt% 2000 PAA-Na时达到159?±?6?A/m3。使用调节pH与微滤相结合,以及BES-OMBR系统阴极电解液pH上升相结合的回收方法来回收汲取液2000 PAA-Na时,第一次回收的汲取液所产生的最大电流密度(175 A/m3)比初始产生的电流密度(164 A/m3)更大,接下来的4次回收过程所产生电流密度逐渐降低。
英文题目 Municipal Wastewater Treatment by Bioelectrochemical Assisted-Osmosis Membrane Bioreactor
英文主题词 Osmotic membrane bioreactor,Microbial fuel cell, Wastewater treatment,Osmosis performance,Current generation performance
英文摘要 Water and energy shortages are two major challenges, and it is significant to achieve simultaneous energy recovery and pollutant removal for indirect or direct potable reuse applications from wastewater. Microbial fuel cells (MFCs) are an emerging technology that can convert chemical energy in organic compounds to electrical energy through catalytic reactions of microorganisms under anaerobic conditions. On the other hand, forward osmosis (FO) is an emerging technology for water reuse and desalination, and has potential benefits of lower fouling propensity and lower energy consumption due to the absence of external hydraulic pressure. In this study, the feed side of a FO was converted to an anode of a MFC and integrated as BES-OMBR system, where both the effluent quality and current generation performance would improve, and the possibility for membrane fouling reduced, which can be a promising candidate for wastewater treatment in an energy-efficient way. The specific objectives of this study were to (1) examine the the feasibility of poly acrylic acid PAA as DS in the term of osmosis performance and recovery efficiency; (2) evaluate the operation performance with PAA DS in FO system; (3) examine the operation performance with PAA DS in optimal FO system; (4) evaluate the operation performance with PAA DS in osmosis membrane bioreactor (OMBR) system; (5) examine the osmosis and current generation performance with PAA DS in BES-OMBR system. The results have important implications to further development of the BES-OMBR system with the following conclusions: Dynamic light scattering revealed that the hydrodynamic diameter of PAA increased with decreasing pH. The PAA-Na was in the polyelectrolytes state when the pH was over the pH response point, and that was in the aggregation state when the pH was lower the pH response point during the recovery process. Thus, the pH response point affected the acid and alkali dosage. The highest DS recovery efficiency by the combined pH?+?MF approach was 99.68% at pH of 4.35, resulting in relatively low PAA-Na concentration in the recovery water (60~67 mg/L). The water flux generated by the FO system using DI water as feeding solution was affected by the PAA-Na DS concentration and molecular weight (MW), and a higher concentration or lower MW had a higher water flux. The FO system achieved a high water flux of 18.0?±?0.5?LMH, low reverse salt flux (RSF) of 0.11?±?0.01?gMH, and the?JS/JW?of 6.1?±?0.3?mg/L with 25?wt% PAA-Na (2000?Da) as the DS,?and the operation cost was estimated at 0.259?CNY/m3. The water flux generated by the optimal FO system using DI water as feeding solution was affected by the PAA-Na DS concentration during170-h operation, and a higher concentration had a higher water flux. The FO system achieved a high water flux of 14.5?LMH, low reverse salt flux (RSF) of 0.18?gMH, and the?DS concentration in the feed side of 132 mg/L with 30?wt% 2000 PAA-Na as the DS. The water flux generated by the OMBR system using DI water as simulate wastewater was affected by the PAA-Na DS concentration during 110-h operation, and a higher concentration had a higher water flux. The FO system achieved a high water flux of 11.4 LMH, low reverse salt flux (RSF) of 0.18?gMH, the?DS concentration in the feed side of 43 mg/L, and the COD concentration in the feed side of 56 mg/L with 30?wt% 2000 PAA-Na as the DS. The maximum DS degradation rate in the feed solution was 6 mg/(d m3), and the maximum COD degradation rate in the feed solution was 63 mg/(d m3). The water flux generated by the OMBR system over 600-h operation using recovered PAA-Na DS with five-cycles decreased to 1.3% of that generated by original PAA-Na DS. There was no TOC and ammonia accumulation in the feed solution, and the the operation cost was estimated at 2.121~4.354 CNY/kg COD. The water flux generated by the BES-OMBR system using simulate wastewater as feeding solution was affected by the PAA-Na DS concentration and MW, and a higher concentration or lower MW had a higher water flux. The FO system achieved a high water flux of 12.6?±?0.5?LMH, low reverse salt flux (RSF) of 0.05?±?0.00 gMH with 32?wt% 2000 PAA-Na as the DS. The water flux generated by the BES-OMBR system over 60-h operation using recovered PAA-Na DS with five-cycles decreased to 4.2~6.8% of that generated by original PAA-Na DS. The PAA loss due to RSF during operation was 3~20?mg/L, and the COD concentration in the feed side effluent was 65~71?mg/L. The highest DS recovery efficiency was 99.36~99.87?%, resulting in the relatively low PAA-Na concentration in the recovered water (15~21 mg/L), and the the operation cost was estimated at 0.350 CNY/m3. The current density generated by the BES-OMBR system had the same trend with current density, and a higher concentration or lower MW had a higher current density. The FO system achieved a high current density of 159?±?6?A/m3 with 32?wt% 2000 PAA-Na as the DS. The highest current density of 175 A/m3 generated by recovered PAA-Na DS during first recovery process was higher that of original PAA-Na DS (175 A/m3), and it decreased during the following process.
学术讨论
主办单位时间地点报告人报告主题
东南大学土木工程学院 2016年3月 逸夫建筑馆 杨玉立 汲取液聚合电解液溶液PAA-Na在正渗透中的渗透性能及其回收
东南大学土木工程学院 2017年5月 逸夫建筑馆 陈宇伟 浅水湖泊浮游植物生态学研究
美国弗吉尼亚理工大学 2016年3月 美国黑堡 杨玉立 Resource (Nutrient-energy-water) Recovery by a Bioelectrochemical Assisted-Anaerobic Osmosis Membrane Bioreactor
美国弗吉尼亚水环境协会 2016年9月 美国弗吉尼亚海滩 杨玉立 Effective Recovery of Polyelectrolyte Draw Solutes Facilitated by Cathodic pH Increase in Osmotic Microbial Fuel Cells
美国弗吉尼亚理工大学 2017年10月 美国黑堡 杨玉立 Sustainable operation of osmotic microbial fuel cells through effective reproduction of polyelectrolyte draw solutes facilitated by cathodic pH increase
美国弗吉尼亚水环境协会 2017年9月 美国弗吉尼亚海滩 杨玉立 Enhanced nitrogen removal by membrane-aerated nitritation-anammox in a bioelectrochemical system
东南大学土木工程学院 2015年3月 逸夫建筑馆 杨玉立 改性生物载体在膜生物反应器中强化脱氮的机理研究
南京师范大学环境学院 2017年11月 学行楼606室 杨玉立 电化学正渗透膜生物反应器处理市政废水的研究
     
学术会议
会议名称时间地点本人报告本人报告题目
The Association of Environmental Engineering & Science Professors 2017年6月 美国密歇根大学 Efficient Recovery of Polyelectrolyte Draw Solutes in Forward Osmosis towards Sustainable Water Treatment
The International Symposium on Water Environment Systems 2015年1月 日本东北大学 Analysis of enhanced nitrogen removal in MBR with new biological carriers addition by real-time PCR
彭永臻院士学术报告会 2016年11月 东南大学礼堂二楼报告厅
上海市政工程设计研究总院张辰大师学术报告会 2016年10月 东南大学礼堂二楼报告厅
     
代表作
论文名称
Nitrogen removal and microbial community structure in membrane bioreactors with addition of alkali-r
Optimal interval of periodic polarity reversal under automated control for maximizing hydrogen produ
Sustainable operation of osmotic microbial fuel cells through effective reproduction of polyelectrol
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
王国祥 正高 教授 博导 南京师范大学环境学院
江和龙 正高 研究员 博导 中科院地理与湖泊研究所
吴慧芳 正高 教授 博导 南京工业大学
李先宁 正高 教授 博导 东南大学能环学院
傅大放 正高 教授 博导 东南大学土木学院
      
答辩秘书信息
姓名职称工作单位备注
马金霞 副高 副教授 东南大学土木学院