水解—好氧化物处理造纸中段废水工艺的研究

【作者】 陈欣；

【导师】 王伯铎；

【作者基本信息】 西北大学 ， 自然地理， 2003， 硕士

【摘要】 本文分析了我国造纸行业的特点及其废水治理的现状。从低投资和降低运行费用的角度，通过动态模拟实验研究了以水解酸化和好氧生化(间歇曝气活性污泥法，以下简称SBR)为主的工艺流程。在水解酸化预处理造纸中段废水时，水解酸化反应器中应增加搅拌设备并悬挂生物填料，废水的停留时间宜大于10小时。造纸中段废水经过水解酸化预处理后，可以提高废水的好氧可生物降解性；废水中不溶解性COD浓度将有一定程度的提高。工程设计中，在水解酸化反应器后应加设沉淀单元。在SBR好氧生物处理系统中，曝气反应时间宜大于6.5小时。当废水初始COD浓度小于1000mg／l时，可以直接应用SBR工艺处理造纸中段废水，而不必采用任何预处理措施。在SBR生物反应器之后必须采用强化固液分离的处理单元，如过滤、混凝沉淀等。当温度低于10℃时，SBR系统出水水质恶化。在SBR工艺中，闲置期对SBR工艺处理造纸中段废水影响不大。在工程设计和运行过程中，可以采用ORP值作为SBR工艺曝气反应的终点指示，其曝气反应终点的ORP值特征是：急速升高后稳定于30mv～50mv之间。更多还原

【Abstract】 The characteristics of paper industry and problems of paper making wastewater treatment are presented in this paper. In order to decrease both investment and operating expenses, the feasibility to treat the alkali straw pulp making intermediate wastewater by biological hydrolysis (acidification) and sequencing batch reactor (SBR) is studied using laboratory-scale reactor. The results show that the stirrers and biological carriers are needed in the reactor of biological hydrolysis when the wastewater is pretreated. Also, Hydraulic retention time (HRT) is beyond 10 hours. The biodegradability and insoluble chemical oxygen carbon (COD) of the wastewater are enhanced to some extent after biological hydrolysis. Thus, sedimentation unit is followed for removing suspended solid in the wastewater. In the system of SBR following biological hydrolysis reactor, the aeration period should exceed 6.5 hours. The wastewater is treated directly by SBR system without pretreatment on condition that the COD of the feed is less than 1,000 mg/l. It should be emphasized that SBR reactor must be followed by useful separation process, such as filtration, coagulant sedimentation and so on. The effluent from SBR system does not meet the requirement of discharge standard as the temperature is below 10C,.The same treatment efficiency are achieved using two different aeration methods in SBR operation, such as the restrained aeration and the unrestrained aeration The idle period of SBR system does not affect the removal efficiency. The value of oxidation-reduction potential (ORP) can be employed to reflect the endpoint of aeration period of SBR system in engineering design. The endpoint characteristic of the aeration period in SBR system is that the value of ORP rises sharply and fluctuates between 30mv and 50mv subsequently.更多还原