Fluorki w środowisku wodnym – zagrożenia i metody usuwania

• Autorzy: Bodzek M. , Konieczny K.

Identyfikatory

DOI

10.17512/ios.2018.2.1

Warianty tytułu

EN

Fluorine in the water environment - hazards and removal methods

• Języki publikacji: PL

Abstrakty

PL

Występowanie fluorków (F^-) w wodach naturalnych jest związane z ich obecnością w skorupie ziemskiej, jak również aktywnością przemysłową człowieka. O ile obecność jonów F^- w wodzie do picia w ilości 0,5÷0,7 mg/l zabezpiecza przed próchnicą zębów, o tyle ich nadmiar jest uważany za poważny problem zdrowotny. Regularne spożywanie wysoce fluorowanej wody, zawierającej 1,5÷4 mg F/l, wywołuje wiele chorób związanych z tkanką kostną (fluoroza, artretyzm i osteoporoza), chorobę Alzheimera, utratę pamięci i inne neurologiczne dolegliwości. Według World Health Organization, a także polskich przepisów, maksymalne stężenie fluorków w wodzie do picia nie może przekraczać 1,5 mg/l, a rekomendowany jest zakres 0,5÷1 mg/l. Opracowano szereg metod usuwania fluorków, które można podzielić na trzy grupy procesów: koagulacja i wytrącanie, membranowe techniki separacji oraz adsorpcja/wymiana jonowa.

EN

High fluorine concentrations in aquatic environment, even above 30 mg/L, are often detected in many parts of the world. Due to fluorine effects on health, World Health Organization (WHO) as well as national health authorities have established its maximum permissible concentration in drinking water at the level of 1.5 mg/L. This review article aims to provide detail information on researchers’ efforts in the field of fluorides removal during potable water production. The contaminant elimination methods have been broadly divided in three sections, i.e. coagulation/precipitation, adsorption and membrane techniques. Both, precipitation with the use of calcium salts or coagulation with aluminum sulphate and ferric salts followed by sedimentation are used for fluorine removal. In electrocoagulation, a coagulant is generated in situ by means of oxidation of anode usually made of aluminum or iron. The removal of fluorides from water and wastewater can be performed with the use of many different types of adsorbents, which are either applied already at industrial scale or still tested in the laboratory or pilot scale. The adsorption on activated aluminum oxide is already a common technology of fluorine removal from water and wastewater, and it is also indicated as the one of the best available technique (BAT) in this field. However, the adsorbent price is relatively high, while its efficiency mostly depends on pH and co-ions presence. Recently, a lot of effort has been devoted to develop an effective method of aluminum oxide modification with the use of metals’ oxides impregnation, which reveal significant defluoridation efficiency. The applicability of carbon based sorbents is less efficient than of aluminum compounds, hence a number of studies on modification of carbon based materials towards defluoridation improvement are carried out. The special attention is dedicated to carbon nanotubes. Among many natural materials, which are usable to fluorine adsorption, many different types of clays and minerals have been tested. Biosorbents, especially modified chitosan, also offer promising results in fluorine removal process. Additionally, a group of waste materials, which contain metal oxides, have also been examined to fluorides concentration decrease in contaminated aqueous streams, and those can be considered as alternative cheap sorbents. Synthetic layered double hydroxides (LDHs), hydrocalcite like compounds and nanosorbents have also gained a lot of attention as potential fluorine adsorbent, as they reveal high affinity toward the contaminant. Among membrane techniques reverse osmosis, nanofiltration, ultrafiltration in integrated systems, electrodialysis and Donnan dialysis have been discussed. The most important benefits offered by membrane processes are very high removal efficiency (up to 98%), single stage treatment, simultaneous water disinfection and low requirement for additional chemicals. However, the removal of other anions present in treated water is a serious disadvantage of those techniques, as it results in the need of water remineralization to assure the proper quality of finally produced potable water. Additionally, membrane processes are quite expensive due to relatively high initial concentrated solution containing fluorine may become a significant problem.

Słowa kluczowe

PL

uzdatnianie wody; usuwanie fluorków; koagulacja; wytrącanie; adsorpcja; procesy membranowe

EN

water treatment; fluoride removal; coagulation; precipitation; adsorption; membrane processes

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Inżynieria i Ochrona Środowiska
• Rocznik: 2018
• Tom: T. 21, nr 2
• Strony: 113--141
• Opis fizyczny: Bibliogr. 95 poz., 1 wykr.

Twórcy

autor

Bodzek M.

• Polska Akademia Nauk, Instytut Podstaw Inżynierii Środowiska, ul. M. Curie-Skłodowskiej 34, 41-819 Zabrze

autor

Konieczny K.

• Politechnika Śląska, Wydział Inżynierii Środowiska i Energetyki, Instytut Inżynierii Wody i Ścieków, ul. S. Konarskiego 18, 44-100 Gliwice

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).