Hybrid Process of Adsorption/Coagulation/Ceramic MF for Removing Pesticides in Drinking Water Treatment—Inline vs. Contact Tank PAC Dosing
Two pilot trials of powdered activated carbon (PAC)/(coagulation)/ceramic microfiltration were conducted to compare continuous 10–12 mg/L PAC inline dosing with 8–10 mg/L dosing to a 2 h-contact tank. Two low turbidity/low natural organic matter (NOM, total organic carbon <2 mg C/L) surface water...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/11/2/72 |
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| author | Rui M. C. Viegas Margarida Campinas Rosário Coelho Helena Lucas Maria João Rosa |
| author_facet | Rui M. C. Viegas Margarida Campinas Rosário Coelho Helena Lucas Maria João Rosa |
| author_sort | Rui M. C. Viegas |
| collection | DOAJ |
| description | Two pilot trials of powdered activated carbon (PAC)/(coagulation)/ceramic microfiltration were conducted to compare continuous 10–12 mg/L PAC inline dosing with 8–10 mg/L dosing to a 2 h-contact tank. Two low turbidity/low natural organic matter (NOM, total organic carbon <2 mg C/L) surface waters spiked with 7.2–10.3 µg/L total-pesticides were tested and the dosing options were compared towards operational performance, average removal of pesticides and NOM and costs. Removal differences between the two PAC dosing options depended on pesticides’ amenability to adsorption and NOM characteristics (254 nm absorbance, A254). Waters containing low A254-absorbing NOM and only pesticides amenable to adsorption showed very high removals (all pesticides ≥93%) and no significant differences between the two PAC dosing options. Waters containing higher A254-absorbing NOM and high loads of pesticides less amenable to adsorption (dimethoate, bentazone) required higher inline PAC dose. Those or more severe conditions may require PAC doses higher than tested to comply with the Drinking Water Directive limits for pesticides. Cost analysis showed PAC inline dosing is more cost-effective than PAC dosing to the contact tank when identical PAC dose is sufficient or when the doses are low, even if 50% higher for inline dosing, and the plant is small. |
| first_indexed | 2024-03-09T04:14:36Z |
| format | Article |
| id | doaj.art-fb391054abfa48c7a059bf9d92a9ee7b |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-09T04:14:36Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-fb391054abfa48c7a059bf9d92a9ee7b2023-12-03T13:56:40ZengMDPI AGMembranes2077-03752021-01-011127210.3390/membranes11020072Hybrid Process of Adsorption/Coagulation/Ceramic MF for Removing Pesticides in Drinking Water Treatment—Inline vs. Contact Tank PAC DosingRui M. C. Viegas0Margarida Campinas1Rosário Coelho2Helena Lucas3Maria João Rosa4Water Quality and Treatment Laboratory, Urban Water Unit, Hydraulics and Environment Department, LNEC—National Civil Engineering Laboratory, 1700-066 Lisbon, PortugalWater Quality and Treatment Laboratory, Urban Water Unit, Hydraulics and Environment Department, LNEC—National Civil Engineering Laboratory, 1700-066 Lisbon, PortugalAdA—Águas do Algarve S.A., Rua do Repouso, 8000-302 Faro, PortugalAdA—Águas do Algarve S.A., Rua do Repouso, 8000-302 Faro, PortugalWater Quality and Treatment Laboratory, Urban Water Unit, Hydraulics and Environment Department, LNEC—National Civil Engineering Laboratory, 1700-066 Lisbon, PortugalTwo pilot trials of powdered activated carbon (PAC)/(coagulation)/ceramic microfiltration were conducted to compare continuous 10–12 mg/L PAC inline dosing with 8–10 mg/L dosing to a 2 h-contact tank. Two low turbidity/low natural organic matter (NOM, total organic carbon <2 mg C/L) surface waters spiked with 7.2–10.3 µg/L total-pesticides were tested and the dosing options were compared towards operational performance, average removal of pesticides and NOM and costs. Removal differences between the two PAC dosing options depended on pesticides’ amenability to adsorption and NOM characteristics (254 nm absorbance, A254). Waters containing low A254-absorbing NOM and only pesticides amenable to adsorption showed very high removals (all pesticides ≥93%) and no significant differences between the two PAC dosing options. Waters containing higher A254-absorbing NOM and high loads of pesticides less amenable to adsorption (dimethoate, bentazone) required higher inline PAC dose. Those or more severe conditions may require PAC doses higher than tested to comply with the Drinking Water Directive limits for pesticides. Cost analysis showed PAC inline dosing is more cost-effective than PAC dosing to the contact tank when identical PAC dose is sufficient or when the doses are low, even if 50% higher for inline dosing, and the plant is small.https://www.mdpi.com/2077-0375/11/2/72powdered activated carbon/coagulation/microfiltrationhybrid membrane processpesticidesceramic membranesinlinetank |
| spellingShingle | Rui M. C. Viegas Margarida Campinas Rosário Coelho Helena Lucas Maria João Rosa Hybrid Process of Adsorption/Coagulation/Ceramic MF for Removing Pesticides in Drinking Water Treatment—Inline vs. Contact Tank PAC Dosing Membranes powdered activated carbon/coagulation/microfiltration hybrid membrane process pesticides ceramic membranes inline tank |
| title | Hybrid Process of Adsorption/Coagulation/Ceramic MF for Removing Pesticides in Drinking Water Treatment—Inline vs. Contact Tank PAC Dosing |
| title_full | Hybrid Process of Adsorption/Coagulation/Ceramic MF for Removing Pesticides in Drinking Water Treatment—Inline vs. Contact Tank PAC Dosing |
| title_fullStr | Hybrid Process of Adsorption/Coagulation/Ceramic MF for Removing Pesticides in Drinking Water Treatment—Inline vs. Contact Tank PAC Dosing |
| title_full_unstemmed | Hybrid Process of Adsorption/Coagulation/Ceramic MF for Removing Pesticides in Drinking Water Treatment—Inline vs. Contact Tank PAC Dosing |
| title_short | Hybrid Process of Adsorption/Coagulation/Ceramic MF for Removing Pesticides in Drinking Water Treatment—Inline vs. Contact Tank PAC Dosing |
| title_sort | hybrid process of adsorption coagulation ceramic mf for removing pesticides in drinking water treatment inline vs contact tank pac dosing |
| topic | powdered activated carbon/coagulation/microfiltration hybrid membrane process pesticides ceramic membranes inline tank |
| url | https://www.mdpi.com/2077-0375/11/2/72 |
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