摘要
本论文以隧道施工过程中产生的废水为研究对象,通过试验分析等手段对废水水质、水量等进行分析研究,旨在通过上述研究,制订出一套有效合理的处理工艺流程,将其对环境的影响控制到环境质量标准所允许的程度,为此类废水的治理提供一定的理论依据,对类似工程建设提供技术支持,同时可为进一步的理论研究提供技术指导和资料储备。
本项目在总结国内外隧道施工废水处理现状及水质分析的基础上,在国内率先提出采用混凝处进工艺进行隧道施工废水处理,通过对不同药剂进行混凝试验,优选出了7“聚合铝-阳离子有机高分子絮凝剂+非离子型聚丙烯酰胺作为运行药剂,由于圆锥旋流澄清器处理隧道废水具有设备简单、管理方便和良好的水力条件等特点,故在优选出药剂的基础上,采用圆锥旋流澄清器进行运转试验。
试验内容包括药剂的筛选和澄清器的运转试验。试验研究表明,7“聚合铝-阳离子有机高分子絮凝剂具有脱稳迅速并且处理效果好的优点。由于该絮凝剂本身呈酸性,适合于偏碱性的隧道施工废水,并配合高分子非离子型聚丙烯酰胺使用,能够加强颗粒的迅速凝聚,使矾花的密度和强度增大,含水率降低。在Q=0.3m3/hr时,出水的悬浮物SS=41.40mg/L,含油量为3.863mg/L,COD=84.4mg/L,去除率分别为66.10%、49.73%和19.54%；在Q=0.375m3/hr时,出水的悬浮物SS—为52.10mg/L,含油量为3.733mg/L,COD=84.4 mg/L,去除率分别为65.62%、60.15%和24.10%,两者隧道废水出水均能够满足污水排放一级标准。同时通过对圆锥旋流澄清器处理隧道废水的机理和澄清器内的水头损失的分析研究,证明了圆锥旋流澄清器具备一定的实际应用可行性。
根据试验室工艺运转试验从而找到了合理高效的工艺处理流程,即采用圆锥旋流澄清器作为主要处理设备,选用7#聚合铝-阳离子有机高分子絮凝剂加非离子型聚丙烯酰胺处理隧道施工废水,通过混凝沉淀达到去除隧道施工废水中的悬浮物、油类等污染物的目的,从而实现废水达标排放。
This thesis, by taking tunnel construction waste water as the research subject, experimentally investigated the wastewater quality and flux, and further draw a set of technological process of wastewater treatment to keep the effect on the environment in the permissible range under environmental quality standards, provided theoretical support for the treatment of similar wastewater and technical support for similar engineering construction,also provided technical instruction and data reserve for further theoretical research.
The paper presented coagulative treatment of tunnel construction wastewater firstly in china. By analyzing coagulation treatment result of different coagulant,7# Al-polymerization-cationic organic polymer flocculant and non-ionic polypropylene acyle amine are chosen as the operating coagulant. The Taper Whirling Flow Clarifier is characterized by simple, easy operation and good hydraulic conditions in the treatment process of tunnel construction wastewater. So the mechanism of using taper whirling flow clarifier to treat tunnel wastewater.
Experiment content includes chosing coagulant and.clarification experiment. Experimental research shows that the 7# flocculant has advantages of rapid destability and good treating effect. As the flocculant is acidic, it is suitable to the meta-alkalescence tunnel wastewater. Besides, the flocculant with polypropylene acyle amine strengthen the flocculation speed of colloid particles, which increasing the density and intensity and reducing the moisture content of flocs. When Q=0.3m3/hr, the average concentration of Suspended Solids(SS), Oil and chemical Oxygen Demands(COD) of the outlet waters are estimated to 41.40mg/L,3.863mg/L, 84.4mg/L, and these removal ratio are 66.10%、49.73% and 19.54%, respectively; when Q=0.375m3/hr, the average concentration of SS, Oil and COD are estimated to 52.10mg/L,3.733mg/L,78.10mg/L, and these removal ratio are 65.62%、60.15%和24.10% respectively. The two outlet water quality can meet the first class requirement of sewage discharge standards. The mechanism of using taper whirling flow clarifier to treat tunnel wastewater and hydraulic loss in the clarifier are analyzed.The result shows that taper whirling flow clarifier has certainly actual application feasibility.
Found the appropriate and efficient technological process by technology operation experiment in lab.The process is that adopt Taper Whirling Flow Clarifier as main treatment equipment,7# Al-polymerization-cationic organic polymer flocculant and non-ionic polypropylene acyle amine are chosen to treat tunnel construction wastewater.Using coagulation-settlement experiment, the suspended substances,oils, and other pollutants was reduced,,so as to reach the emission standards..
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