ZHENGJian-jun,JIANGYi-feng,AOHui.Vacuum Ultraviolet Oxidation in Combination with Anaerobic Baffle Reactor for Restaurant Wastewater Treatment at Low Temperature[J].China Water & Wastewater,2024,40(21):102-108.
Vacuum Ultraviolet Oxidation in Combination with Anaerobic Baffle Reactor for Restaurant Wastewater Treatment at Low Temperature
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第21期
Page:
102-108
Column:
Date of publication:
2024-11-01
- Keywords:
- restaurant wastewater; vacuum ultraviolet; anaerobic baffle reactor; low temperature; discharge to municipal sewers
- Abstract:
- The composition of oily restaurant wastewater is intricate and the wastewater volume fluctuates significantly, thereby causing the phenomenon that the effluent of the oil separator commonly utilized in catering industry frequently exceeds the discharge standard to municipal sewers. The novel combined process of vacuum ultraviolet oxidation and anaerobic baffle reactor (VUV-ABR) was employed to treat actual restaurant wastewater at the low temperature during autumn and winter. With the assistance of high?energy VUV irradiation and requisite hydraulic agitation (internal cycle flow of 4.5 L/min), the fats could be rapidly photolyzed. However, the removal performance of detergent and COD was unsatisfactory. The removal efficiencies of the three were 83%, 17%, and 19% at 15 minutes, and 84%, 28%, and 28% at 60 minutes, respectively. The hydraulic agitation facilitated the diffusion and reaction of active substances in the vicinity of the lamp area. However, aeration with air or nitrogen severely impeded the occurrence of photooxidation due to the intense absorption of VUV by gas bubbles. Unsaturated fats were predominantly eliminated through direct photolysis, and detergents as well as COD were also associated with photoexcited oxidation. Simultaneously, the treatment performance of VUV in combination with ABR under the gradient of hydraulic load was explored. It was discovered that the removal efficiencies of fats, COD, and BOD5 of VUV combined with ABR under the circumstances of 8-15 ℃, 15 minutes of light exposure, and 18 hours of anaerobic HRT were enhanced by 46%, 15%, and 27% respectively compared to ABR alone. The synergetic coefficients were 2.0, 1.3, and 1.6 respectively, and the effluent quality met the limits specified in Wastewater Quality Standards for Discharge to Municipal Sewers (GB/T 31962-2015). In the combined process, VUV and ABR collaborated with each other. The former occupied a small area, was convenient to operate, and could eliminate the inhibition of fats on anaerobic metabolism. The latter compensated for the deficiency of the poor oxidation and mineralization performance of VUV. The contribution ratios of VUV to the removal of fats and COD were 91% and 28% respectively.
Last Update:
2024-11-01