Research On Wastewater Treatment Of Inclined-plates Hydrolysis-hybrid/MBR

In recent years, the application of membrane bioreactor has been greatlypromoted owing to the membrane bioreactor has many advantages compared with other wastewater treatment processes. However, there are many problems in the application of membrane biorea ctor, especially the problem of membrane fouling caused by the long-running of reactor. This experiment started from membrane fouling problems, based on the results of other studies. The effects of water quality and operating conditions on membrane fouling were studied in the experiment by using three sets of identical membrane bioreactor.In the case of other conditions identical, the water of the three groups of membrane bioreactor A.B.C were added to the Nitrification effluent, Ordinary domestic sewage, Ordinary domestic sewage and refractory water. After 60 days of continuous operation of the reactor, membrane bioreactor for water quality of the treatment effect is very different. From the effect of COD removal, three groups of membrane bioreactor can achieve effluent COD A standard level, but only the membrane bioreactor B can achieve the COD remove more than 90%. From the effect of Ammoniaremoval, only the membrane bioreactor A can achieve the Ammonia remove more than 90%. Achieve effluent Ammonia A standard level. the membrane bioreactor B and C can achieve the Ammonia remove at 75% and can’t achieve effluent Ammonia A standard level, For the removal of total nitrogen and total phosphorus, the three groups of the reactors had no obvious effect. From the viewpoint of membrane fouling, the growth rate of TMP is a membrane bioreactor C> B> A, At the same time the SMP contents of the three groups are: C, 33 mg / l, 15 mg / l, 10 mg / l, EPS content are C, 65 mg / l, B, 25 mg / l, A, 10 mg / l,the corr elation between SMP, EPS and membrane fouling has been proved. Experiment by comparing the supernatant and membrane effluent SMP found the effluent SMP protein significantly less than the protein content in the supernatant and protein, this phenomenonindic ated that the protein through the membrane coating system can betrapped, and thus produce membrane fouling.The influence of operating conditions on membrane fouling was also studied. Experiment studied the effect of chemicals on phosphorus removal and membrane fouling by adding salt and aluminum salt into the reactor.From the results of this study, we acted the phosphorus iron salts as the best agent, and the best dosage of iron salt is 25mg/l. From membrane fouling, the growth rate of TMP, aluminum salt is 0.067kpa/d, and ferric salts is 0.8kpa/d. From the point of view of SMP, the content of soluble microbial products from 7.5mg/l down to 5.0mg/l when adding aluminum salt, while the content of soluble microbial products from 7.0mg/l down to 5.2mg/l when adding ferric salt, The reduction of chemical agents to SMP was achieved by reducing the content of polysaccharide in SMP.By studying the aeration intensity and sludge age on membrane fouling, Membrane bioreactor exists optimal aeration intensity and bes t SRT, according to the operating conditions of the reactor. For this experiment, The best aeration intensity is 0.06 m /h and the best sludge age is 30 d.Through one year’s experiment, we found that the relationship between SMP and EPS has a great relationship with membrane fouling. Through the study of iron salt and aluminum salt effects on membrane fouling found that iron salt and aluminum salt can reduce the membrane fouling rate. At the same time that there is the best aeration intensity and sludge age with the different reactor operating conditions of MBR system.