多酚工业废水的处理工艺本科论文 .doc

设计总说明 茶多酚是一种理想的食品天然抗氧化剂,具有抗癌治病、防衰老、防辐射、消除人体自由基等多种生理功效,广泛用于食品、油脂、医药、化工等行业.近年来,对于茶多酚的提取方法多见于报道。论文以茶多酚生产废水为研究对象，针对该废水有机物浓度高，含生物毒性物质和含盐量高等特点提出了预处理－水解酸化－SBR－后处理的组合工艺.投加聚铝对混合废水进行预处理，CODcr和茶多酚的去除率都非常的高.由于该废水中所含大都为天然物质,该工艺是废水通过水解酸化池后，提高废水的可生化性. 由于该废水中所含大都为天然物质，其分子质量较大，而采用水解酸化可使水中的高分子物质在产酸菌的作用下分解为小分子，减少好氧处理的负荷，同时在厌氧条件下也可使废水中残留的茶多酚得到部分降解。在预处理阶段对茶多酚的去除是否完全对于废水处理的效果是至关重要的。但是在预处理阶段很难将茶多酚去除完全，而好氧对茶多酚基本没有降解作用，虽然水解酸化对茶多酚的降解率很低，但为了尽可能地降低茶多酚的浓度和减小出水的色度，水解酸化池应采用较长的停留时间。 因为SBR法的处理设施十分简单，管理非常方便去除有机物效率很高,基建费用明显低于常规活性污泥法,所以本工艺采用SBR法, 废水中的COD和BOD主要是在SBR池中去除. 茶多酚废水经预处理和生化处理后水质得到了明显改善，但出水仍然不能达标，尤其是色度较大,所以可采用混凝沉淀进行后处理,混凝沉淀试验采用聚合铝作混凝剂，有关试验结果表明，对厌氧24h、好氧生化12h的出水进行混凝沉淀处理，最佳投药量为80mg/L，沉淀1.0h后COD可降到80mg/L，出水色度＜50倍，出水清澈透明，完全达到该地区的废水排放标准。 关键字: 茶多酚,抗氧化剂,预处理,水解酸化,SBR法 ABSTRACT Tea polyphenols is an ideal natural foods anti - oxidant, which has many physiological functions such as anticancer and treating disease, anti - aging, radiation protection and eliminating human body free radical, etc, and has been widely used in foods, fats, medicine and chemical industry. The extrdction of tea polyphenols has been reported much for the past few years。Tea Polyphenols(TP)production wastewater is characterized by high CODcr,high salinity,bio-toxicity,etc. a three-stage treatment process is proposed including pretreatment,anaerobic hydrolysis and SBR,and post treatment.Adding polyaluminum chloride into the mixed wastewater,the removal efficiency of CODcr and TP is very efficiency .In this process, first, the wastewater runs through the hydrolysis acidification pool, there is stuffing. so that the BOD5/CODcr can be increased. As the wastewater contained mostly natural substances, so they have larger molecular weight, hydrolysis and acidification of the water can polymer substances in the acid-producing bacteria to decompose under small molecules, reduce the load of aerobic treatment, while under anaerobic conditions can also enable the wastewater residual TP partial degraded. In preprocessing stage,the TP removed