Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge Produced
The volume of produced sludge and its characteristics depend on the quantitative and qualitative characteristics of wastewater, the treatment process, and the operating conditions. Relatively high production of excess biological sludge is considered one of the main drawbacks of aerobic processes use...
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Water and Wastewater Consulting Engineers Research Development
2024-10-01
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| Series: | آب و فاضلاب |
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| Online Access: | https://www.wwjournal.ir/article_211782_0f9bf72ba9fa63ca4b7ceaa14ff6d452.pdf |
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| author | Naeim Banisaeid Afshin Takdastan Mahboobeh Cheraghi Ali Afrous Reaz Jalilzadeh Yengejeh |
| author_facet | Naeim Banisaeid Afshin Takdastan Mahboobeh Cheraghi Ali Afrous Reaz Jalilzadeh Yengejeh |
| author_sort | Naeim Banisaeid |
| collection | DOAJ |
| description | The volume of produced sludge and its characteristics depend on the quantitative and qualitative characteristics of wastewater, the treatment process, and the operating conditions. Relatively high production of excess biological sludge is considered one of the main drawbacks of aerobic processes used in biological wastewater treatment. This research was conducted in the existing industrial treatment plant of Pars Shiraz sugar factory with a capacity of 5 cubic meters per day. In this research, the effects of temperature changes in the anoxic tank and return line were investigated to increase the biological removal of sludge, reduce the excess biological sludge; also, the effects of temperature changes on the biokinetics parameters in the activated sludge system were analyzed. The average values of the biomass production coefficient (Y) or growth efficiency in the 100-days study period, after the biological reactor reaches a stable state, varied from 0.75 to 0.54 at the return sludge temperature of 40 °C, decreasing to 0.38 at 50 °C and 0.30 at 60 °C in terms of (gMLSS/gCOD). This research demonstrated that while the biomass production coefficient decreases with the increasing return sludge temperature, it also has a negative impact on the quality of the effluent with respect to both quality and biokinetics parameters. The results indicated that the existing conventional bioreactor, with the return sludge temperature of 40 °C, achieves a significantly higher efficiency in removing pollutants, maintainingconventional range of biokinetics parameters, reducing the amount of sludge production coefficient and excess sludge disposal. |
| format | Article |
| id | doaj-art-a0ef74e088b7459e8237ef72f705309e |
| institution | Kabale University |
| issn | 1024-5936 2383-0905 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Water and Wastewater Consulting Engineers Research Development |
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| series | آب و فاضلاب |
| spelling | doaj-art-a0ef74e088b7459e8237ef72f705309e2025-02-01T07:44:57ZengWater and Wastewater Consulting Engineers Research Developmentآب و فاضلاب1024-59362383-09052024-10-013538910310.22093/wwj.2024.475559.3433211782Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge ProducedNaeim Banisaeid0Afshin Takdastan1Mahboobeh Cheraghi2Ali Afrous3Reaz Jalilzadeh Yengejeh4PhD. Candidate, Dept. of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, IranProf. of Environmental Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, IranAssist. Prof., Dept. of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, IranAssist. Prof., Dept. of Water Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, IranAssoc. Prof., Dept. of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, IranThe volume of produced sludge and its characteristics depend on the quantitative and qualitative characteristics of wastewater, the treatment process, and the operating conditions. Relatively high production of excess biological sludge is considered one of the main drawbacks of aerobic processes used in biological wastewater treatment. This research was conducted in the existing industrial treatment plant of Pars Shiraz sugar factory with a capacity of 5 cubic meters per day. In this research, the effects of temperature changes in the anoxic tank and return line were investigated to increase the biological removal of sludge, reduce the excess biological sludge; also, the effects of temperature changes on the biokinetics parameters in the activated sludge system were analyzed. The average values of the biomass production coefficient (Y) or growth efficiency in the 100-days study period, after the biological reactor reaches a stable state, varied from 0.75 to 0.54 at the return sludge temperature of 40 °C, decreasing to 0.38 at 50 °C and 0.30 at 60 °C in terms of (gMLSS/gCOD). This research demonstrated that while the biomass production coefficient decreases with the increasing return sludge temperature, it also has a negative impact on the quality of the effluent with respect to both quality and biokinetics parameters. The results indicated that the existing conventional bioreactor, with the return sludge temperature of 40 °C, achieves a significantly higher efficiency in removing pollutants, maintainingconventional range of biokinetics parameters, reducing the amount of sludge production coefficient and excess sludge disposal.https://www.wwjournal.ir/article_211782_0f9bf72ba9fa63ca4b7ceaa14ff6d452.pdfactivated sludgeexcess sludge reductionthermo-biological methodbiokinetic parametersreturn sludge |
| spellingShingle | Naeim Banisaeid Afshin Takdastan Mahboobeh Cheraghi Ali Afrous Reaz Jalilzadeh Yengejeh Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge Produced آب و فاضلاب activated sludge excess sludge reduction thermo-biological method biokinetic parameters return sludge |
| title | Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge Produced |
| title_full | Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge Produced |
| title_fullStr | Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge Produced |
| title_full_unstemmed | Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge Produced |
| title_short | Investigation of the Use of the Thermo-Biological Method in the Return Sludge Line on the Biokinetics of the Activated Sludge Process and the Amount of Excess Sludge Produced |
| title_sort | investigation of the use of the thermo biological method in the return sludge line on the biokinetics of the activated sludge process and the amount of excess sludge produced |
| topic | activated sludge excess sludge reduction thermo-biological method biokinetic parameters return sludge |
| url | https://www.wwjournal.ir/article_211782_0f9bf72ba9fa63ca4b7ceaa14ff6d452.pdf |
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