MSG Wastewater Treatment with UASB-AOMBR Coupling process

Monosodium glutamate (MSG) wastewater is a very refractory case of high strength organic wastewater. To investigate the effect of operating variables on treatment of MSG wastewater, a laboratory scale study was conducted. The treatment of MSG wastewater was studied by UASB- A/OMBR process. The effect of operating variables such as organic volumetric load rate (OLR), pH, volatile fatty acids (VFA), ammonia (NH3- N) and alkalinity on efficiency of treatment and recovery of biogas was investigated. The results showed that, in the UASB stage, the gas production rate was 3.02 - 8.83 kg COD /m(3)center dot d volume load, the gas production rate and COD load volume was positively related; as influent COD in range of 11878 - 16922 mg center dot l(-1), COD removal rate of effluent was in range of 57.00 - 79.63 %. The removal of COD by MBR can reach 90%, even to 96%, and the removal of ammonia is 95% - 100%. UASB-A/O MBR has a good ability of preventing fluctuation of load and can remove COD and ammonia effectively.