污水处理有机硫化物排放特征与控制策略研究

发布时间：2018-04-02 08:00

本文选题：城市污水处理厂　切入点：甲硫醇　出处：《北京林业大学》2016年硕士论文

【摘要】：城市污水处理厂在完成对污水净化的同时,也会向城市空气中排放VOS(挥发性有机硫化物)等有毒有害污染物,导致的城市环境空气质量恶化,已经引起我国政府和广大城镇居民关注。因此,研究城市污水处理厂VOS产生排放规律,制定减排控制技术及策略具有重要意义。本文对VOS检测分析方法进行了研究。确定采用Nutech8900预浓缩仪和气相色谱联用,同步测定环境空气中微量挥发性有机硫化物(甲硫醇、甲硫醚和二甲二硫),测定精密度(n=6)均在20%以内；检出限分别为甲硫醇1.44×10-4 mg·m-3、甲硫醚4.80×10-5mg·m-3和二甲二硫3.70×10-5mg·m-3；3种硫化物标准工作曲线分别为：甲硫醇y=2.069x+8.7409(R2=0.9999,p0.01)；甲硫醚y=2.2819x+9.5203(R2=0.9998,p0.01)；二甲二硫y=2.0065x+9.9822(R2=0.9998,p0.01),满足环境空气中微量挥发性有机硫化物测定的要求。本文根据污水处理典型工艺各处理单元的特点及VOS在污水处理过程中产生释放的机理,确定了适用于城市污水处理厂三种工艺不同处理单元水相、水-气界面、封闭车间、厂区/厂界、污泥处理间、废气处理设施排放口等点位的VOS监测方法。利用该监测方法,选取华北地区、珠三角、长三角作为研究VOS释放规律的三个区域,现场监测城市污水处理厂三种典型工艺VOS产生排放情况。监测结果表明,曝气单元VOS的释放通量明显高于非曝气单元的VOS释放通量。对比不同处理单元VOS的吨水释放量,可知格栅、沉砂池、生化反应阶段等前端处理单元为VOS主要释放单元；同种工艺不同地区释放量：珠三角长三角华北地区；同地区不同工艺释放量：A2/OSBR氧化沟。
[Abstract]:While the sewage treatment plant has finished purifying the sewage, it will also discharge toxic and harmful pollutants, such as VOS (volatile organic sulfide) into the urban air, which will lead to the deterioration of the air quality in the urban environment. It has attracted the attention of our government and the majority of urban residents. Therefore, the VOS emission law of municipal wastewater treatment plants is studied. It is of great significance to formulate emission reduction control techniques and strategies. In this paper, VOS detection and analysis methods are studied. The simultaneous determination of trace volatile organic sulfides (methyl mercaptan) in ambient air by Nutech8900 preconcentration instrument and gas chromatography is determined. The precision of determination of methyl sulfide and dimethyl disulfide was within 20%. The detection limits of methyl mercaptan 1.44 脳 10 ~ (-4) mg m ~ (-3), methyl sulfide 4.80 脳 10-5mg m ~ (-3) and dimethyl disulfide 3.70 脳 10-5mg m ~ (-3) were as follows: methyl thiol y2.069x 8.7409R _ 2O _ (0.9999) p 0.01; methyl sulfide y2.2819x 9.5203R2O _ (0.99998) p0.01a; dimethyl disulfide 2.0065x 9.9822x 9.9822 R20.9998 (p0.01). According to the characteristics of each treatment unit in the typical wastewater treatment process and the mechanism of VOS release in the process of sewage treatment, The VOS monitoring method suitable for water phase, water-gas interface, closed workshop, plant area / plant boundary, sludge treatment room, exhaust gas treatment facility outlet and so on in three different treatment units of municipal wastewater treatment plant has been determined. This paper selects North China, Pearl River Delta and Yangtze River Delta as the three regions to study the VOS release law, and monitors the discharge of VOS in three typical processes of municipal wastewater treatment plant. The release flux of VOS in aeration unit was significantly higher than that in non-aerated unit. Comparing with the amount of water released per ton of VOS in different treatment units, the front-end treatment units such as grid, sand settling tank and biochemical reaction stage were the main releasing units of VOS. The amount released from different regions of the same technology is: North China of the Yangtze River Delta in the Pearl River Delta and the oxidation ditch of 1 / 2 / OSBR in the same area.
【学位授予单位】：北京林业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703

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