ASBR-SBR工艺处理养猪场废水

在实验室条件下，利用两个序批式反应器，即厌氧SBR——好氧SBR系统对养猪场废水进行生物处理以去除其有机碳和氮，周期长度为24小时。在厌氧反应器中，流入的是原废水和好氧反应器的部分出水回流液，有机碳的厌氧分解伴随着反硝化过程。在好氧反应器中，更多的有机碳被去除，氨主要氧化成亚硝酸根，当混合液溶解氧浓度很低时，在好氧反应器中的进水阶段也有反硝化现象。测试了从l到3的3个循环比条件下的出水情况，在不同的测试条件下整个过程的平均表现为：TOC去除8l-91％，TKN去除85—91％。最初使用的是低的循环比，出水中仍含有10-28％的TKN，循环比R越高，TN的去除率越高，最终出水中NOx^-——N的浓度越低。

Anaerobic Sbr-Aerobic Sbr for the Treatment of Piggery Wasteuater

Biological treatment of a piggery wastewater for organic carbon and nitrogen removal in a combined anaerobic aerobic system was investigated using two laboratory scale sequencing batch reactors.The cycle length was 24 h.In the anaerobic reactor,fed with raw wastewater and recycling from the areobic reactor,denitrification followed by anaerobic digestion of organic carbon was observed.In the aerobic reactor,more organic carbon removal and ammonia oxidation to mainly nitrite occurred.Denitrification was also boserved in the aerobic reactor during the filling period,when mixed liquor dissolved oxygne concentration was very low.Three recycle to influent ratios from 1 to 3 were tested.Average performance of the overall process,in the different conditions tested,were a TOC removal of 81 to 91% and 85 to 91% of TKN.10 to 28% of the niitial TKN was discharged because of the low recycle to influent ratios used.The higher the recycle to influent ratio,the higher the efficiency of total nitrogen removal,the lower the concentrations of nitrogen oxides in the final effluent.