scholarly journals Study on Applicability of Catalytic Wet-Oxidation Process for Sewage Sludge Treatment

1996 ◽  
Vol 7 (3) ◽  
pp. 123-132
Author(s):  
Yoshiaki Harada ◽  
Kenichi Yamasaki
Keyword(s):  
Sewage Sludge ◽  
Oxidation Process ◽  
Wet Oxidation ◽  
Catalytic Wet Oxidation ◽  
Sludge Treatment ◽  
Sewage Sludge Treatment

Anaerobic Treatment of Sewage Sludge Treated by Catalytic Wet Oxidation Process in Upflow Anaerobic Sludge Blanket Reactors

1992 ◽  
Vol 26 (3-4) ◽  
pp. 867-875 ◽  
Author(s):  
J. J. Song ◽  
N. Takeda ◽  
M. Hiraoka
Keyword(s):  
Sewage Sludge ◽  
Oxidation Process ◽  
Anaerobic Treatment ◽  
Single Step ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Wet Oxidation ◽  
Catalytic Wet Oxidation ◽  
Volumetric Loading ◽  
Anaerobic Sludge Blanket

To increase the efficiency of methane recovery in anaerobic treatment, sewage sludge was treated by catalytic wet oxidation process(CWOP).The CWOP is designed to treat sewage sludge with the aid of a newly developed catalyst. It is a treatment process, by which concentrated COD components and suspended solids in various kinds of sludge can be simultaneously oxidized and treated with great efficiency in a single step without dilution. After CWOP, this supernatant was treated by upflow anaerobic sludge blanket(UASB) for recovery of methane. This experiment was to evaluate the acclimation of UASB process to the supernatant of sewage sludge treated by CWOP. For the granule growth and accumulation, supernatant was introduced stepwise (25%, 33%, 50%, 100%). The supernatant was 7,200 mg-COD/L which contained 53% carbonic acids. The reactor was operated at a volumetric loading rate from 1.8 (kg·COD/m3·day) to 14.4 (kg·COD/m3·day) and overall HRT of less than 24 hrs throughout the experiment. In the conventional anaerobic biochemical process of methane gas recovery was limited to 50% of COD recovery. As a result of this study, the COD recovery to about 93% was obtained by the coebination of CWOP and UASB process. The following conditions were enough for pretreatment: temperature, 270°C; pressure, 86kg/m2; stoichiometric air ratio, 1.1; reaction time, 24 min. These results indicate that the CWOP-UASB process may be attractive as an alternative sewage sludge treatment.

Application of Microwave Oxidation Process for Sewage Sludge Treatment in a Continuous-Flow System

2017 ◽  
Vol 143 (9) ◽  
pp. 04017050 ◽  
Author(s):  
Kwang Victor Lo ◽  
Ruihuan Ning ◽  
Cristina Kei Yamamoto de Oliveira ◽  
Marie De Zetter ◽  
Asha Srinivasan ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Continuous Flow ◽  
Oxidation Process ◽  
Flow System ◽  
Sludge Treatment ◽  
Continuous Flow System ◽  
Sewage Sludge Treatment

Comparison of sewage sludge treatment systems for regions with hot climate

2007 ◽  
Vol 2 (1) ◽  
Author(s):  
Petia Mijaylova Nacheva ◽  
G. Moeller-Chávez ◽  
E. Ramírez-Camperos ◽  
L. Cardoso-Vigueros
Keyword(s):  
Sewage Sludge ◽  
Alkaline Treatment ◽  
Sludge Treatment ◽  
Tropical Regions ◽  
Aeration Time ◽  
Sludge Stabilization ◽  
Hot Climate ◽  
Aerobic Stabilization ◽  
Sewage Sludge Treatment ◽  
High Pathogenic

The tropical regions have specific problems associated with high pathogenic density in the sewage sludge. The aim of this study was to select an adequate sludge stabilization and valorization system comparing the performance of four technologies: anaerobic stabilization without heating, aerobic stabilization, alkaline treatment with lime and aerobic composting. The study was performed in a pilot plant which was built and operated during six months. The main problem for the beneficial use of the sludge was its pathogenicity. All the systems allowed obtaining stabilized products which met the bacteriological criteria for some kind of use. The compost and the alkalinized sludge were bacteriologically safe for use without restrictions in accordance with the Mexican regulations. The accomplishment of the parasitological criteria for use was however impossible with the anaerobic and with the aerobic systems. The compost obtained at 55-60°C with 25d aeration time and the alkaline sludge fulfill the criteria established by for forest and agriculture use and for soil conditioning. The composting could reach the requirements for unrestricted use when operated at temperatures 65-70°C during 45 days which makes it the most adequate sludge treatment system for hot climate regions.

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