Effectiveness Study Of Treating Ethylene Glycol Wastewater By Upflow Anaerobic Sludge Blanket Reactor

Ethylene glycol is an important chemical raw material, its production process produces high concentration of organic matter in wastewater,causing large fluctuations in water quality and quantity, directly discharged would cause serious pollution to surrounding water bodies. This article argues that laboratory UASB reactor for treating ethylene glycol wastewater research results, and then introduce UASB reactor for treating ethylene glycol wastewater applications in industry, the main results are as follows:1 Gradually increase COD concentration of the influent, inoculated granular sludge UASB reactor treating ethylene glycol wastewater, it was up to 13100mg/L, volumetric loading reached 13.1kgCOD/(m~3.d), when the reactor runned to 61d, it occured serious acidification , the effluent pH declined to 5.5 , VFA went up to 20.5mmol/L; inoculated digested sludge UASB reactor treating ethylene glycol wastewater, it was up to 10800mg/L, volumetric loading reached 10.8 kgCOD/(m~3.d), when the reactor runned to 60d, it occurred serious acidification .The effluent pH was 5.2, VFA went up to 23.1mmol/L.2 Fixed influent COD concentration of 3000mg/L, HRT by the gradual reduction of 72h to 7h, the COD removal ratio gradually decreased when treating ethylene glycol wastewater by UASB reactor, when it runned 60d or so, the reactor occurred serious acidification, VFA increased to 20mmol/L, pH decreased to 5.5 below. In light of considerations of efficiency and volume load, the proposed HRT of of Treating Ethylene Glycol Wastewater by Upflow Anaerobic Sludge Blanket Reactor maintained at 30h ~ 50h.3 Treating ethylene glycol wastewater by UASB reactor, the inflow was 600 mL for a day, influent concentration was 50000mg/L.When the effluent recycle ratio increased from 0 to 6, the effluent COD concentration from 1000mg/L decreased to about 500mg/L so, the water alkalinity by the 700mg/L increased to about 900mg/L or so. When the the effluent recycle ratio increased 10, the effluent COD concentration was still less than the COD concentration of non-recycling effluent. The effluent alkalinity decreased, but was still greater than the alkalinity of non-recycling effluent.4 Treating ethylene glycol wastewater by UASB reactor, the influent alkalinity were 800mg/L, 1200mg/L and 1600mg/L, the effluent pH and alkalinity increased. When the influent alkalinity was 1200mg/L and 1600mg/L, the effluent COD concentration reactor were the same.5 When the influent COD: N: P ratio were respectively 400:5:1, 300:5:1 and 200:5:1 , the COD concentration of UASB reactor effluent was similar. When the COD: N: P were 500:5:1 and 600:5:1, the effluent COD concentration rose.6 Treating ethylene glycol wastewater by 3L UASB reactor, 1.5L were respectively inoculated with anaerobic granular sludge and digested sludge to the reactors, removing COD and operation of its processing were basically the same, when inoculated with anaerobic digested sludge HRT should be considered. As HRT was less than 29h, the effluent sludge contained small particles, and could lead to loss of microbial biomass in the reactor.7 Treating the effluent of UASB reactor by using Aerobic Activated Sludge Process, the influent COD concentration was between 300mg/L and 1300mg/L, pH was between 6.8 and 7.5, HRT was 24h, the effluent COD concentration was between 30mg/L and 130mg/L, pH 7.4 to 7.9.8 The UASB reactor as the main body of a Chemical Industry Co., Ltd. ethylene glycol wastewater treatment, the reactor inoculated with anaerobic digested sludge, the design volume load was 6kgCOD/(m~3.d), cycle ratio was 6:1. After more than a month of commissioning, the entire processing system was stable, the effluent COD concentration was between 1000mg/L and 2500mg/L, MBR effluent COD concentration was nearly less than 100mg/L.