Restaurant Wastewater Research Articles

Evaluation of a Novel Integrated Bioreactor—AOS System for Treating Oil-Containing Restaurant Wastewater on Site in Hong Kong

AOS system is an anaerobic digestion reactor (A-section, UASB or UBF), oxidation degradation reactor (O-section, aerobic biofilm reactor), and physical sedimentation tank (S-section) 3-in-1 integrated reactor. The compact bioreactor was applied to treat oil-containing restaurant's wastewater on site in Hong Kong. The treatment efficiency was observed at different HRT. Experimental results indicated that the AOS system for treating oil-containing restaurant wastewater on site was feasible when HRT at 0.6 days above. During the running period, the net sludge generation rate of the AOS system was only about 0.08–0.09 g g-1 removed COD, and the utmost COD specific volumetric removal rate (SVRR) of the system reached 2.77 gL-1 d-1. The utmost specific biomass substrate utilization rate (SBSUR) of COD in O-section and A-section reached 1.22 d-1 and 0.128 d-1, respectively. In addition, the experiment results showed that the AOS system with a filter in UASB (that is UBF's AOS system) could bear much more great HLR comparing with UASB's AOS and was more efficient for treating oil-containing restaurant's wastewater on site.

Electrocoagulation and Electroflotation of Restaurant Wastewater

A combined electrocoagulation and electroflotation process was applied to restaurant wastewater treatment. The effects of operational variables on performance were examined. The electrocoagulation ...

Separation of pollutants from restaurant wastewater by electrocoagulation

Abstract The characteristics of restaurant wastewater were investigated. High oil and grease contents were detected. Electrocoagulation was used to treat this type of wastewater. Different electrode materials and operational conditions were examined. Aluminum was preferred to iron. Charge loading was found to be the only variable that affected the treatment efficiency significantly. The optimum charge loading and current density were 1.67–9.95 F/m3 wastewater and 30–80 A/m2 depending on the wastewater tested. The removal efficiency of oil and grease exceeded 94% for all wastewaters tested. The experimental results also show that the electrocoagulation can neutralize wastewater pH. Several mechanisms associated with pH variation are proposed.

The Aerobic Treatment of Grease-Containing Fast Food Restaurant Wastewaters

Fast food restaurants typically produce a low volume grease-containing wastewater, generated by their daily kitchen activities, for which there is currently no acceptable treatment technology. This paper describes the performance of a novel bioreactor, the weir tank reactor, for the treatment of fast food restaurant wastewater at an organic loading rate (OLR) of 5 kg wastewater m -3 d -1 . Two different mixed microbial cultures (one designated MC1, the other an activated sludge), were used together with fast food grease residues from two different sources (Woking, Surrey, and Birmingham, West Midlands). The reactor achieved a high (84–96%) removal of FOG (fats, oils and greases) irrespective of the microbial inoculum, the source of the FOG or the alkalinity (low or high) of the water. This high performance was attributed to a combination of the effective mechanical mixing regime and the periodic removal of a portion of microbial solids from the weir tank reactor liquor, in the form of an effluent, during the weir tank reactor studies.