Abstract
Supernatant comes from dewaterization of sewage sludge, and contains biologically nondegradable organics. Therefore, it is hard to be treated by conventional activated sludge method. The development of a new technology is required to decrease the chemical oxygen demand (COD) effectively below 30 mg/l. Irradiation of high energy electron beams can convert nondegradable organics in water into substances which are biodegradable. However, sufficient dissolved oxygen in water is needed to induce oxidation effectively. In the present study, the treatment of supernatant was studied using an apparatus which can be irradiated by high intensity electron beams in flow system under supersaturation with oxygen by pressurization up to 3 atms. The dependence of oxygen concentration on the reduction in absorbance at 230 nm of azo dye (Acid Red 265) aqueous solution was examined, and it was clarified that sufficient oxygen was supplied in the solution up to about 14 kGy under 3 atms of oxygen. Radiation treatment of supernatant which came from the leather works was carried out using the above apparatus. However, as this supernatant contained high concentration of nitrite, the nitrite was removed by limited aeration activated sludge method. By this pretreatment, COD was reduced from 200 mg/l to 53 mg/l.
More>>
Hosono, Masakazu;
Arai, Hidehiko;
[1]
Aizawa, Masaki;
Shimooka, Toshio;
Yamamoto, Ichiro;
Shimizu, Ken;
Sugiyama, Masashi
- Japan Atomic Energy Research Inst., Takasaki, Gunma (Japan). Takasaki Radiation Chemistry Research Establishment
Citation Formats
Hosono, Masakazu, Arai, Hidehiko, Aizawa, Masaki, Shimooka, Toshio, Yamamoto, Ichiro, Shimizu, Ken, and Sugiyama, Masashi.
Treatment test of supernatant from sewage sludge by irradiation of high energy electron beams under supersaturation with oxygen.
Japan: N. p.,
1993.
Web.
Hosono, Masakazu, Arai, Hidehiko, Aizawa, Masaki, Shimooka, Toshio, Yamamoto, Ichiro, Shimizu, Ken, & Sugiyama, Masashi.
Treatment test of supernatant from sewage sludge by irradiation of high energy electron beams under supersaturation with oxygen.
Japan.
Hosono, Masakazu, Arai, Hidehiko, Aizawa, Masaki, Shimooka, Toshio, Yamamoto, Ichiro, Shimizu, Ken, and Sugiyama, Masashi.
1993.
"Treatment test of supernatant from sewage sludge by irradiation of high energy electron beams under supersaturation with oxygen."
Japan.
@misc{etde_10150793,
title = {Treatment test of supernatant from sewage sludge by irradiation of high energy electron beams under supersaturation with oxygen}
author = {Hosono, Masakazu, Arai, Hidehiko, Aizawa, Masaki, Shimooka, Toshio, Yamamoto, Ichiro, Shimizu, Ken, and Sugiyama, Masashi}
abstractNote = {Supernatant comes from dewaterization of sewage sludge, and contains biologically nondegradable organics. Therefore, it is hard to be treated by conventional activated sludge method. The development of a new technology is required to decrease the chemical oxygen demand (COD) effectively below 30 mg/l. Irradiation of high energy electron beams can convert nondegradable organics in water into substances which are biodegradable. However, sufficient dissolved oxygen in water is needed to induce oxidation effectively. In the present study, the treatment of supernatant was studied using an apparatus which can be irradiated by high intensity electron beams in flow system under supersaturation with oxygen by pressurization up to 3 atms. The dependence of oxygen concentration on the reduction in absorbance at 230 nm of azo dye (Acid Red 265) aqueous solution was examined, and it was clarified that sufficient oxygen was supplied in the solution up to about 14 kGy under 3 atms of oxygen. Radiation treatment of supernatant which came from the leather works was carried out using the above apparatus. However, as this supernatant contained high concentration of nitrite, the nitrite was removed by limited aeration activated sludge method. By this pretreatment, COD was reduced from 200 mg/l to 53 mg/l. Then, the biodegradability of supernatant irradiated under supersaturation with oxygen was examined. The final COD of the supernatant was reduced below 30 mg/l by the combined method of irradiation of 7 kGy and biological treatment. (author).}
place = {Japan}
year = {1993}
month = {Feb}
}
title = {Treatment test of supernatant from sewage sludge by irradiation of high energy electron beams under supersaturation with oxygen}
author = {Hosono, Masakazu, Arai, Hidehiko, Aizawa, Masaki, Shimooka, Toshio, Yamamoto, Ichiro, Shimizu, Ken, and Sugiyama, Masashi}
abstractNote = {Supernatant comes from dewaterization of sewage sludge, and contains biologically nondegradable organics. Therefore, it is hard to be treated by conventional activated sludge method. The development of a new technology is required to decrease the chemical oxygen demand (COD) effectively below 30 mg/l. Irradiation of high energy electron beams can convert nondegradable organics in water into substances which are biodegradable. However, sufficient dissolved oxygen in water is needed to induce oxidation effectively. In the present study, the treatment of supernatant was studied using an apparatus which can be irradiated by high intensity electron beams in flow system under supersaturation with oxygen by pressurization up to 3 atms. The dependence of oxygen concentration on the reduction in absorbance at 230 nm of azo dye (Acid Red 265) aqueous solution was examined, and it was clarified that sufficient oxygen was supplied in the solution up to about 14 kGy under 3 atms of oxygen. Radiation treatment of supernatant which came from the leather works was carried out using the above apparatus. However, as this supernatant contained high concentration of nitrite, the nitrite was removed by limited aeration activated sludge method. By this pretreatment, COD was reduced from 200 mg/l to 53 mg/l. Then, the biodegradability of supernatant irradiated under supersaturation with oxygen was examined. The final COD of the supernatant was reduced below 30 mg/l by the combined method of irradiation of 7 kGy and biological treatment. (author).}
place = {Japan}
year = {1993}
month = {Feb}
}