scholarly journals Effects of Heat Treatment and Hydrogen Peroxide (H2O2) on the Physicochemical and Rheological Behavior of an Activated Sludge from a Water Purification Plant

2012 ◽  
Vol 33 ◽  
pp. 293-302 ◽  
Author(s):  
Larbi Hammadi ◽  
Alain Ponton ◽  
Mansour Belhadri
Keyword(s):  
Heat Treatment ◽  
Hydrogen Peroxide ◽  
Activated Sludge ◽  
Water Purification ◽  
Rheological Behavior ◽  
Purification Plant

Experience in Implementation of Systems Applied for Drainage Water Ion-Selective Purification from Radionuclides at Units 1,2 of Novovoronezh-2 NPP

ANRI ◽  
2020 ◽  
Vol 0 (4) ◽  
pp. 64-70
Author(s):  
Vladimir Povarov ◽  
Igor' Gusev ◽  
Sergey Rosnovsky ◽  
Dmitriy Statsura ◽  
Vladimir Kazansky ◽  
...  
Keyword(s):  
Water Purification ◽  
Drainage Water ◽  
Purification Method ◽  
Selective Sorbent ◽  
Iron Based ◽  
Purification Plant ◽  
Nickel Ferrocyanide ◽  
Satisfactory Quality

The article is dedicated to the assessment of the experience in drainage water purification from radionuclides using ion-selective purification method on Units 1,2 Novovoronezh-2 NPP. Application of an ion-selective sorbent based on nickel ferrocyanide, as well as the preliminary oxidation of corrosive origin radiongjuclides, allow to achieve a satisfactory quality of purification from Cs-134, Cs-137, Co-60, Co 58, Mn-54, Cr-51. However, this method turned out to be ineffective for drainage water purification from Be-7, Sb-124, Sb-125. The article presents a possible method for drainage water purification from Be-7, Sb-124, Sb-125 using an iron-based coagulant, prospects for the modernization of the ion-selective drainage water purification plant, as well as plans to improve methods for drainage water purification at Novovoronezh-2 NPP

TREATABILITY OF 2,4-D PRODUCTION WASTEWATERS

1994 ◽  
Vol 30 (3) ◽  
pp. 73-78 ◽  
Author(s):  
O. Tünay ◽  
S. Erden ◽  
D. Orhon ◽  
I. Kabdasli
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Sludge ◽  
Partial Oxidation ◽  
Chloride Concentration ◽  
Chemical Oxidation ◽  
Cod Removal ◽  
Optimum Conditions ◽  
Organic Loading ◽  
Activated Sludge System ◽  
Biological Treatability

This study evaluates the characterization and treatability of 2,4-D production wastewaters. Wastewaters contain 20000-40000 mg/l COD, 17000-30000 mg/l chloride and pH is around 1.0. Chemical oxidation with hydrogen peroxide provided almost complete COD removal. The optimum conditions are 3:1 H2O2/COD oxidant dosage, 3000 mg/l Fe3+ as catalyst and pH 3. Partial oxidation at 0.5:1 H2O2//COD ratio is also effective providing 67% COD removal. A batch activated sludge system is used for biological treatability. Dilution is needed to maintain a tolerable chloride concentration which increases through COD removal. pH also increased during COD removal. 85% COD removal is obtained for the 50% dilution at an organic loading of 0.3 day‒1 on a COD basis. Completely and partially oxidized wastewaters are also treated in the activated sludge down to 30 mg/l BOD5.

AGEING MECHANISM OF PVDF FOLLOW-FIBER MEMBRANES USED IN WATER PURIFICATION PLANT

2019 ◽  
Vol 75 (7) ◽  
pp. III_341-III_350
Author(s):  
Yuki YONEZAWA ◽  
Takashi HASHIMOTO ◽  
Shinobu KAZAMA ◽  
Kumiko OGUMA ◽  
Kazuyoshi FUJIMURA ◽  
...  
Keyword(s):  
Water Purification ◽  
Fiber Membranes ◽  
Purification Plant

Decomposition of hydrogen peroxide on cerium dioxide-nickel oxide two-component catalysts and the effect of ionizing radiation on them

1984 ◽  
Vol 49 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Viliam Múčka
Keyword(s):  
Heat Treatment ◽  
Hydrogen Peroxide ◽  
Ionizing Radiation ◽  
Nickel Oxide ◽  
Cerium Dioxide ◽  
Catalytic Properties ◽  
Specific Activity ◽  
Ion Pairs ◽  
Composition Region ◽  
Two Component

Some physical and catalytic properties of cerium dioxide-nickel oxide two-component catalysts have been studied over the entire composition region, employing the decomposition of hydrogen peroxide in aqueous solution as a model catalytic process. The two oxides have been found to affect each other, particularly for NiO contents of 9.1 and 96.7 mol%; the mutual influencing, the nature of which in the conditions applied remains unaffected by heat treatment of the sample or by its exposition to ionizing radiation, is manifested by the nonmonotonic dependences of the oxidation power and of the specific activity of the catalysts on their composition. This can be interpreted in terms of the concept of bivalent catalytic centres, assuming that for nickel oxide the centres consist of Ni2+-Ni3+ ion pairs, for cerium dioxide they consist of Ce3+-Ce4+ ion pairs, and that in the region of the mutual influencing , Ni2+-Ce4+ ion pairs play a major role. Within the scope of this concept, the increase in the oxidation power of all the catalysts in question and a simultaneously decrease in the specific activity of the pure nickeloxide exposed to ionizing radiation can be explained in terms of the ionization effect.

scholarly journals Deliberative architecture for smart sensors in the filtering operation of a water purification plant

2021 ◽  
Vol 1730 (1) ◽  
pp. 012088
Author(s):  
E. Mendoza ◽  
J. Andramuño ◽  
J. Núñez ◽  
I. Benítez
Keyword(s):  
Water Purification ◽  
Smart Sensors ◽  
Purification Plant

Effective Measures for CO2 Reduction Harnessing the Potential Water Energy Present in the Water Service Industry

2010 ◽  
Vol 5 (3) ◽  
Author(s):  
Ohbuchi Yoshihiro ◽  
Sasaki Takanori ◽  
Sumitomo Hiroaki ◽  
Saito Susumu ◽  
Tanaka Yoshiaki
Keyword(s):  
Power Generation ◽  
Water Purification ◽  
Service Industry ◽  
Low Cost ◽  
Co2 Reduction ◽  
Clean Energy ◽  
Net Benefit ◽  
Private Company ◽  
Joint Project ◽  
Purification Plant

Sapporo Waterworks Bureau's (SWB's) measures for CO2 reduction started in 1982 with a hydropower project at the Moiwa Water Purification Plant (MWPP) (cap. 155,000 m3/day). Operation of the generator was temporarily discontinued in 2001 for full-scale reconstruction of the water purification plant (WPP); after the completion of the reconstruction, the power generation equipment was renewed, and the operation resumed as a joint project with a private company in 2007. Power generation is on-site since the hydropower generator within the MWPP area provides energy consumed at the MWPP and the adjoining Waterworks Museum. This power generation is expected to create an energy saving effect equivalent to 1,500 tons of CO2 and over 10 million yen of annual net benefit. In order to increase the usage rate of low-cost, clean energy like hydropower at the WPP, SWB has made a series of adjustments to the operating methods of the plant. Then, as a result, the generation covers 97% of the energy used on-site at present. Furthermore, SWB is considering introducing other hydropower facilities of this kind that harness water transmission energy from the Shiraikawa WPP (cap. 650,000 m3/day) to the major distribution reservoirs.

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