《2000m3d高浓度中药废水处理工艺设计》.doc

摘要 水污染是世界环境污染的重要方面，中药废水是工业水污染的重要组成部分。本文探讨了我国中药废水处理的现状。中药废水有机污染物浓度高、废水的可生化性较强、色度比较高、多为间歇排放、污水成分复杂。根据这些特征和资料分析，本文运用气浮技术、生物厌氧技术和好氧技术，选用气浮--厌氧折板反应器反应器--序批式活性污泥反应器的处理工艺，以达到对中药废水生物处理的目的。加压溶气气浮法是以微小气泡为载体，粘附水中的杂质颗粒，颗粒被气泡挟带浮升至水面与水分分离去除的方法。能有效的去除中药废水中木质素等比重较小，极难重力沉降的悬浮物。厌氧折板反应器是在反应器内设置一系列垂直放置的折流挡板使废水在反应器内沿折流挡板上下折流运动，依次通过每个格室的污泥床直至出口，在此过程中废水中的有机物质与厌氧活性污泥充分接触而得到去除。序批式活性污泥法是在单一反应器内，按时间顺序进水、曝气、沉淀、出水、待机等基本操作，在池内交替形成厌氧、缺氧、好氧、厌氧的环境，在不同阶段，相应的微生物分解有机物，进行硝化、反硝化反应以及释磷、吸磷过程，达到去除有机物，脱氮除磷的目的。经过上述处理工艺的处理，拟使废水的COD由15000mg/L降至100 mg/L；BOD由6000mg/L降至20mg/L，达到国家污水综合排放标准一级水平。 关键词：中药废水；加压溶气气浮法；折板式厌氧反应器；序批式活性污泥法 Abstract Water pollution is a very significant aspect of global environment pollution, and Chinese traditional medicine wastewater is the important constituent of industrial waster pollution. This paper discusses the present status of Chinese traditional medicine wastewater treatment. The concentration of organic contaminant in Chinese traditional medicine wastewater is high, so do its better biodegradability and the Chinese traditional medicine wastewater is always discharged in batch and its components are complex. According to these feature and data analysis, this paper chooses dissolved-air flotation (DAF) technology, biological anaerobic technology and aerobic technology. To achieve the objective of biological treatment of Chinese traditional medicine wastewater, a technology combined by DAF, anaerobic table-flap reactor and SBR is adopted. As a carrier, the micro-bubble can conglutinate impurity solids in the water. The solids are taken to the surface by bubbles so they can be separated from the water. This is the method of pressurization dissolution DAF technology. It can remove suspended substance with low specific gravity and hard to sedimentary, such as lignin. Anaerobic Baffled Reactor (ABR) sets a series of vertical baffles so that the wastewater moves up and down along the baffles. The wastewater passes sludge beds in every room until the exit, and in this process the organis