Filter Backwash Water Treatment Using Dissolved Air Flotation Method
Studies of turbidity removal in the past led to the development of coagulation and filtration processes. New processes are, nowadays, under development for improving upon impurity removal from water. In the present study, a DAF pilot plant and the jar test were used to investigate the optimum condit...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Water and Wastewater Consulting Engineers Research Development
2007-09-01
|
| Series: | آب و فاضلاب |
| Subjects: | |
| Online Access: | http://www.wwjournal.ir/article_1804_aaa1c68c40a0e2f63f6a7f05c7a26675.pdf |
| _version_ | 1818870986068459520 |
|---|---|
| author | Mohammad hassan Mahmoudian Mohammad mehdi Amin Mohammad reza Shahmansouri Mohammad Ghasemian |
| author_facet | Mohammad hassan Mahmoudian Mohammad mehdi Amin Mohammad reza Shahmansouri Mohammad Ghasemian |
| author_sort | Mohammad hassan Mahmoudian |
| collection | DOAJ |
| description | Studies of turbidity removal in the past led to the development of coagulation and filtration processes. New processes are, nowadays, under development for improving upon impurity removal from water. In the present study, a DAF pilot plant and the jar test were used to investigate the optimum conditions for Turbidity, COD, HPC, and MPN removal. The goal of this study was to evaluate continuous inflow DAF performance on a pilot scale in improving the quality of spent filter backwash water in Isfahan Water Treatment Plant (WTP). The results showed that the continuous flow DAF using PACl as coagulant for removal of a turbidity level above 1000 NTU recorded efficiency levels of 97%, 72%, 75%, and 99% for COD, HPC, and MPN, respectively. Statistical analyses indicated that increasing saturation recycle rate led to improved removal of impurity and that the optimum saturation pressure was 4-5 atm for a recycle rate of 20-25 percent. It is concluded that the continuous flow DAF can be an efficient method for turbidity, COD, and bacterial removal from filter backwash water in Isfahan WTP. The turbidity and bacterial removal efficiencies in the coagulation method with sedimentation were reported to be up to 70 and 65 percent, while in this study, using DAF with PACl as coagulant, turbidity, COD, and bacterial removal efficiencies were as high as 97, 72 and 72 percent, respectively. A DAF system is, therefore, recommended for Isfahan WTP filter backwash water recovery and the designs and operation of this system should be a first concern for Isfahan WTP authorities. |
| first_indexed | 2024-12-19T12:15:44Z |
| format | Article |
| id | doaj.art-7668ec3e0cab43ef9816c8e9feafcaf2 |
| institution | Directory Open Access Journal |
| issn | 1024-5936 2383-0905 |
| language | English |
| last_indexed | 2024-12-19T12:15:44Z |
| publishDate | 2007-09-01 |
| publisher | Water and Wastewater Consulting Engineers Research Development |
| record_format | Article |
| series | آب و فاضلاب |
| spelling | doaj.art-7668ec3e0cab43ef9816c8e9feafcaf22022-12-21T20:21:59ZengWater and Wastewater Consulting Engineers Research Developmentآب و فاضلاب1024-59362383-09052007-09-0118324301804Filter Backwash Water Treatment Using Dissolved Air Flotation MethodMohammad hassan Mahmoudian0Mohammad mehdi Amin1Mohammad reza Shahmansouri2Mohammad Ghasemian31Faculty Member, Environmental Health Dept., Ghom University of Medical SciencesAssis. Prof. of Environmental Health, Isfahan University of Medical SciencesAssoc. Prof. of Environmental Health, Isfahan University of Medical SciencesFormer Grad. Student of Environmental HealthStudies of turbidity removal in the past led to the development of coagulation and filtration processes. New processes are, nowadays, under development for improving upon impurity removal from water. In the present study, a DAF pilot plant and the jar test were used to investigate the optimum conditions for Turbidity, COD, HPC, and MPN removal. The goal of this study was to evaluate continuous inflow DAF performance on a pilot scale in improving the quality of spent filter backwash water in Isfahan Water Treatment Plant (WTP). The results showed that the continuous flow DAF using PACl as coagulant for removal of a turbidity level above 1000 NTU recorded efficiency levels of 97%, 72%, 75%, and 99% for COD, HPC, and MPN, respectively. Statistical analyses indicated that increasing saturation recycle rate led to improved removal of impurity and that the optimum saturation pressure was 4-5 atm for a recycle rate of 20-25 percent. It is concluded that the continuous flow DAF can be an efficient method for turbidity, COD, and bacterial removal from filter backwash water in Isfahan WTP. The turbidity and bacterial removal efficiencies in the coagulation method with sedimentation were reported to be up to 70 and 65 percent, while in this study, using DAF with PACl as coagulant, turbidity, COD, and bacterial removal efficiencies were as high as 97, 72 and 72 percent, respectively. A DAF system is, therefore, recommended for Isfahan WTP filter backwash water recovery and the designs and operation of this system should be a first concern for Isfahan WTP authorities.http://www.wwjournal.ir/article_1804_aaa1c68c40a0e2f63f6a7f05c7a26675.pdfFilter EffluentBackwashingDissolved Air Flotation |
| spellingShingle | Mohammad hassan Mahmoudian Mohammad mehdi Amin Mohammad reza Shahmansouri Mohammad Ghasemian Filter Backwash Water Treatment Using Dissolved Air Flotation Method آب و فاضلاب Filter Effluent Backwashing Dissolved Air Flotation |
| title | Filter Backwash Water Treatment Using Dissolved Air Flotation Method |
| title_full | Filter Backwash Water Treatment Using Dissolved Air Flotation Method |
| title_fullStr | Filter Backwash Water Treatment Using Dissolved Air Flotation Method |
| title_full_unstemmed | Filter Backwash Water Treatment Using Dissolved Air Flotation Method |
| title_short | Filter Backwash Water Treatment Using Dissolved Air Flotation Method |
| title_sort | filter backwash water treatment using dissolved air flotation method |
| topic | Filter Effluent Backwashing Dissolved Air Flotation |
| url | http://www.wwjournal.ir/article_1804_aaa1c68c40a0e2f63f6a7f05c7a26675.pdf |
| work_keys_str_mv | AT mohammadhassanmahmoudian filterbackwashwatertreatmentusingdissolvedairflotationmethod AT mohammadmehdiamin filterbackwashwatertreatmentusingdissolvedairflotationmethod AT mohammadrezashahmansouri filterbackwashwatertreatmentusingdissolvedairflotationmethod AT mohammadghasemian filterbackwashwatertreatmentusingdissolvedairflotationmethod |