上流式厌氧污泥床反应器用于黑水预处理

Anaerobic Pretreatment of Black Water with Up flow Anaerobic Sludge Blanket Reactor

摘要:

采用上流式厌氧污泥床反应器(UASB)对黑水进行厌氧预处理，探讨了温度和水力停留时间（HRT）等条件对黑水中有机物的去除转化规律和产甲烷性能的影响.结果表明，厌氧预处理对黑水中有机物去除效果良好，总化学需氧量去除率均在80%左右，悬浮性化学需氧量、溶解性化学需氧量去除率均分别在90%和40%以上.在HRT为10~30 h，总化学需氧量容积负荷率为1.0~2.4 kg·m-3·d-1条件下，水温主要影响溶解性化学需氧量的去除效果；除温度外，截留悬浮物水解酸化的另一限制因素是进水溶解性化学需氧量质量浓度.研究认为，采用UASB反应器厌氧预处理黑水的HRT不应低于30 h、水温为30 ℃左右，该条件下总化学需氧量、悬浮性化学需氧量、溶解性化学需氧量的去除率分别达到79.1%、91.6%和42.1%，厌氧预处理的出水生化需氧量与化学需氧量的质量浓度比提高到0.60.

Abstract:

A bench scale up flow anaerobic sludge blanket reactor(UASB) was used to pre treat black water. The objectives of the research were to investigate the removal transformation rule of organic matter in black water and methane producing properties under different conditions of temperature and hydraulic retention time(HRT). The experimental results show that the UASB reactor has a good removal efficiency on organic matters, the removal efficiency of total chemical oxygen demand is around 80%, and the removal efficiency of the suspended chemical oxygen demand and soluble chemical oxygen demand are above 90% and 40% respectively. Under the condition of HRT（10~30 h）and total chemical oxygen demand volume load rate（1.0~2.4 kg·m-3·d-1）, temperature mainly affects soluble chemical oxygen demand removal. The inflow soluble chemical oxygen demand concentration is another limiting factor of hydrolysis acidification except for temperature. For black water anaerobic pretreatment using up flow anaerobic sludge bed reactor, the HRT should better not be lower than 30 h, and the water temperature is around 30 ℃, at this point, total chemical oxygen demand, suspended chemical oxygen demand and soluble chemical oxygen demand removal efficiency are 79.1%, 91.6% and 42.1% respectively. The biochemical oxygen demand and chemical oxygen demand ratio of effluent is up to 0.60.