Impact of Aerobic Stabilization of Sewage Sludge on PAHs Concentration in Reject Waters

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.

Download Full-text

Impacts of Dissolved Oxygen and Initial Sludge Concentrations on Aerobic Stabilization of Sewage Sludge

Polish Journal of Environmental Studies ◽

10.15244/pjoes/59564 ◽

2016 ◽

Vol 25 (1) ◽

pp. 153-157

Author(s):

Bin Ji ◽

Kai Yang ◽

Wei Chen ◽

Jian Wang ◽

Lei Zhu

Keyword(s):

Sewage Sludge ◽

Dissolved Oxygen ◽

Aerobic Stabilization

Download Full-text

Aerobic Stabilization in the Solid State of Partially Dewatered Sewage Sludge

Processing and Use of Organic Sludge and Liquid Agricultural Wastes ◽

10.1007/978-94-009-4756-6_30 ◽

1986 ◽

pp. 407-413

Author(s):

S. Coppola ◽

F. Villani ◽

F. Romano

Keyword(s):

Solid State ◽

Sewage Sludge ◽

Aerobic Stabilization ◽

Dewatered Sewage Sludge

Download Full-text

Biotic and Abiotic Decomposition of Indeno-Pyrene and Benzo(GHI)Perylene in Sewage Sludge Under Various Light Conditions

Civil and Environmental Engineering Reports ◽

10.2478/ceer-2018-0055 ◽

2018 ◽

Vol 28 (4) ◽

pp. 116-128 ◽

Cited By ~ 1

Author(s):

Maria Włodarczyk-Makuła ◽

Ewa Wiśniowska ◽

Agnieszka Popenda

Keyword(s):

Sewage Sludge ◽

Sodium Azide ◽

Treatment Plant ◽

Final Concentration ◽

Light Conditions ◽

Gas Chromatograph ◽

Standard Mixture ◽

Fourth Series ◽

Pahs Concentration ◽

Gas Chromatograph Mass Spectrometry

Abstract The aim of the studies was to determine the changes in the concentration of PAHs in sewage sludge stored under various light conditions. The sewage sludge samples were stored under aerobic conditions. Sewage sludge samples were deposed in darkness, in laboratory conditions and exposed to UV rays. The changes in the concentration of PAHs were analyzed in fourth series: in sludge samples taken from treatment plant (biotic samples), in sludge with the addition of a standard PAH mixture (biotic samples+PAHs), in sewage sludge with addition sodium azide (abiotic samples) and both a standard mixture and with added sodium azide (abiotic samples+PAHs). Changes in 6-ring of PAHs concentration in sewage sludge samples were studied at seven day intervals for 4 weeks. The concentration of PAHs was determination using gas chromatograph-mass spectrometry GC-MS. The losses of hydrocarbons after 4 weeks of research were in the range of 60 to 97%. It depends of kind of samples. In sewage sludge with standard mixture the effectiveness of PAHs decomposition were in the range of 60 to75%. In sewage sludge with standard mixture of PAHs the losses of hydrocarbons were the highest and reached 97%. The final concentration of PAHs in biotic samples was lower (2-13%) than the concentration of analysed compounds in abiotic samples.

Download Full-text

Impact of microwave radiation on the process of aerobic digestion of sewage sludge

Journal of Water and Land Development ◽

10.1515/jwld-2017-0043 ◽

2017 ◽

Vol 34 (1) ◽

pp. 103-108 ◽

Cited By ~ 1

Author(s):

Justyna Czajkowska ◽

Maciej Malarski Abde ◽

Piotr Nowak ◽

Tadeusz Siwiec

Keyword(s):

Sewage Sludge ◽

Microwave Radiation ◽

Cell Membranes ◽

Energy Intensity ◽

Fine Particles ◽

Sewage Treatment ◽

Aerobic Digestion ◽

Sewage Treatment Plants ◽

Aerobic Stabilization ◽

Aerobic Decomposition

AbstractThe process of aerobic stabilization of sludge is a process used in small or medium sewage treatment plants (up to 15 000 ENI). Owing to its energy intensity resulting from the need for intensive sedimentation and longterm process, many researches are being conducted on its intensification. One such method is disintegration. The purpose of disintegration is to increase the susceptibility of sewage sludge to aerobic decomposition by breaking up sediment flocs into fine particles along with the breakdown of cell membranes and then allowing biodegradation. The paper presents results of research of aerobic stabilized sludge, which is a mixture of non-disintegrated and microwave disintegrated sludge in different volume proportions. It was shown that sludge stabilized more quickly during the first days of the process. The minimum reduction of organic solids required at 38% for stabilized sludge occure earlier in mixed sludge tests than in non-disintegrated sludge.

Download Full-text