工厂化养鱼的pH控制及脱氮系统设计

养殖水中 p H和硝酸盐浓度是影响工厂化水产养殖的两个重要指标 ,本文讨论了 p H和碱性的基本关系以及利用其相互关系来保证封闭循环系统维持在一个允许的 p H范围内 ,设计了一植物脱氮系统来降低水中硝酸盐浓度的积累。

雨水生物滞留系统脱氮的研究综述

介绍了雨水生物滞留系统中氮素的来源、氮素的迁移转化和生物滞留系统脱氮现状,并重点从脱氮的原理,脱氮的影响因素等几个方面论述了植物脱氮国内外主要研究进展和理论成果。针对研究现状提出了改进生物滞留系统的技术措施,为该技术的进一步发展指明方向。

城镇污水厂尾水中硝态氮的微藻吸收效果研究

城镇污水处理厂尾水水质的提升是保护地表水生态平衡的必然选择,其中硝态氮的去除成为阻碍水质提升的关键。针对污水厂尾水低有机碳源高硝酸盐的特征,本文采用无需有机碳源的钝顶螺旋藻和四尾栅藻对污水厂尾水中的硝态氮进行了吸收处理。钝顶螺旋藻不仅可以有效地去除污水厂尾水中的硝态氮,也可以作为蛋白质资源进行回收,具有较好的应用前景。

Nitrogen Removal Efficiencies for Two Biological Nutrient Removal （BNR） Plants in Thailand： Molasses as an External Carbon Source for Enriched Denitrifying Culture in a BNR Process

Two biological nutrient removal （BNR） wastewater treatment plants （WWTPs） in Thailand were selected for study： the Nonghkaem WWTP and the Suvarnabhumi Airport WWTP. For each site the influents, effluents, and supernatant liquids from anaerobic sludge digesters were analyzed for total Kjeldahl nitrogen （TKN）, total nitrogen （TN）, total chemical oxygen demand （TCOD）, biodegradable chemical oxygen demand （bCOD）, and biochemical oxygen demand （BOD）. Nitrogen removal efficiencies in the Nonghkaem WWTP and the Suvarnabhumi Airport WWTP were evaluated. Inadequate nitrogen removal at the Nonghkaem centralized WWTP was found during the summer period. Influent ratios of bCOD：N at the Nonghkaem plant and the Suvarnabhumi Airport plant were 2.42：1-5.45：1 and 4.1：1-6.5：1, respectively. The efficacy of addition of molasses as a carbon source for enriched denitrifying culture in a BNR process at Nonghkaem was studied. Fluorescent in situ hybridization technique （FISH） was used to identify specific nitrifying bacteria （Nitrosomonas spp., Nitrobacter spp. and Nitrospira spp.）. Nitrospira spp. was the most prevalent species in the aeration tank at the Nonghkaem WWTP. This result from FISH suggests that there were significantly low oxygen and nitrite concentration in the aeration tank at the Nonghkaem WWTP during a period of low nitrogen removal.