Topic
Hydraulic retention time
About: Hydraulic retention time is a research topic. Over the lifetime, 6406 publications have been published within this topic receiving 151005 citations.
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TL;DR: It is calculated that approximately 264 m3/ton of CH4 can be produced from a subsequent anaerobic digestion stage, which would be more than twice that required for transportation by the UK flour industry.
66 citations
TL;DR: In this paper, the degradation performance of polychlorinated phenols was studied in continuous flow fluidized-bed reactors using pure oxygen for aeration and celite carrier for cell immobilization.
66 citations
TL;DR: In this paper, the treatment of a mature landfill leachate, from a municipal landfill located in northern Spain (Cantabria), by an integrated system [Fenton reaction−neutralization−ultrafiltration (UF)] was carried out in a pilot plant that operated either in batch and continuous mode.
Abstract: The treatment of a mature landfill leachate, from a municipal landfill located in northern Spain (Cantabria), by an integrated system [Fenton reaction−neutralization−ultrafiltration (UF)] was carried out in a pilot plant that operated either in batch and continuous mode. The initial average chemical oxygen demand (COD) concentration of the leachate was 2100 mg/L, with a biological oxygen demand (BOD5)/COD ratio of 0.08. The sequence of stages implemented was (i) Fenton oxidation, (ii) neutralization of Fenton's effluent to pH 7, and (iii) ultrafiltration with submerged membranes. The influence of different parameters, such as redox potential evolution, H2O2/COD mass ratio, and hydraulic retention time, was investigated in the Fenton oxidation process. The effect of neutralization and UF steps was also studied. COD reduction after the integrated treatment was up to 80%. The final effluent was free of solids, color, and iron. The results demonstrated the high potential of Fenton's reagent in combination wit...
66 citations
TL;DR: Enzymatic hydrolysis of food waste could effectively accelerate Hydrolysis speed, improve substrate utilization rate and increase hydrogen yield, and the optimal HRT obtained was 6 h with the highest hydrogen production rate of 8.02 mmol/(h·L).
Abstract: In this study, the feasibility of biohydrogen production from enzymatic hydrolysis of food waste was investigated. Food waste (solid-to-liquid ratio of 10%, w/v) was first hydrolyzed by commercial glucoamylase to release glucose (24.35 g/L) in the food waste hydrolysate. Then, the obtained food waste hydrolysate was used as substrate for biohydrogen production in the batch and continuous (continuous stirred tank reactor, CSTR) systems. It was observed that the maximum cumulative hydrogen production of 5850 mL was achieved with a yield of 245.7 mL hydrogen/g glucose (1.97 mol hydrogen/mol glucose) in the batch system. In the continuous system, the effect of hydraulic retention time (HRT) on biohydrogen production from food waste hydrolysate was investigated. The optimal HRT obtained from this study was 6 h with the highest hydrogen production rate of 8.02 mmol/(h·L). Ethanol and acetate were the major soluble microbial products with low propionate production at all HRTs. Enzymatic hydrolysis of food waste could effectively accelerate hydrolysis speed, improve substrate utilization rate and increase hydrogen yield.
66 citations
TL;DR: Abiotic losses of 2-CP due to volatilization and photo degradation by sunlight were less than 3% and the results of genotoxicity showed that the degradation products are eco-friendly.
66 citations