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Preliminary Results from Application Phoslock® to Remove Phosphorus Compounds From Wastewater

Kasprzyk M., Gajewska M.

Journal of Ecological Engineering

2017

Vol. 18, nr 4

82--89

The aim of the study is to assess the removal effectiveness of phosphorus compounds by using lanthanum-modified bentonite. This material was produced by the Australian company Phoslock® Water Solutions Pty Ltd. According to the company, Phoslock® has substantial capacity to bound phosphate anions. The investigation was carried out in steady conditions in laboratory model with beakers. The results of the study are related to the determination of hydraulic load, time of mixing and time of sedimentation. Research with synthetic wastewater was conducted in 4 beakers which were mixing by 5, 10, 20 and 30 minutes respectively. Samples for analyzing were taken from each beaker after 30 minutes, 1, 2, 3, 4 and 24 hours of sedimentation. Studies were conducted to determine the optimal dose of Phoslock® with a known concentration of phosphate anions PO43- in artificial wastewater, time of mixing and time of sedimentation. All samples were taken before and after the treatment with Phoslock® and they were analyzed with following parameters: pH, total suspended solids, conductivity, turbidity, color and phosphate concentration. The carried out investigations confirmed high efficiency of phosphate anions PO43- removal (over 95%), and the final concentration as average was 0.1 mg/dm3. The application of Phoslock® for phosphate anions PO43- did not change the pH of final effluent.

Kinetyka adsorpcji jonów fosforanowych z wód powierzchniowych z użyciem preparatu Phoslock

Jodłowski A, Gutkowska E, Dobrzański M

Inżynieria i Ochrona Środowiska

2012

T. 15, nr 3

295--305

Phoslock jest adsorbentem produkowanym na bazie glinki bentonitowej modyfikowanej lantanem, który zgodnie z informacjami literaturowymi skutecznie obniża stężenie fosforanów w wodach powierzchniowych. Mechanizm reakcji polega na wiązaniu anionów fosforanowych z jonami lantanu w stosunku 1:1. W artykule zaprezentowano wyniki badań nad kinetyką adsorpcji jonów fosforanowych przy użyciu preparatu Phoslock, wykorzystując podczas ich interpretacji równanie szybkości reakcji rzędu pseudodrugiego. Przedstawiono wyniki badań dotyczące skuteczności działania preparatu Phoslock prowadzone z wykorzystaniem roztworów wodnych odpowiednio przygotowanych w laboratorium oraz porównawczo wody naturalnej pochodzącej ze sztucznego zbiornika Rochna położonego w odległości około 30 km od Łodzi. Proces adsorpcji jonów fosforanowych zachodził intensywniej w roztworze modelowym niż w wodzie naturalnej.

Eutrophication and its harmful effects cause the need for finding methods of slowing, halting or even reversing this process and its consequences. Currently, the most important and most frequently used methods of remediation are these that use compounds that bind/remove phosphorus. Phoslock is an adsorbent based on lanthanum-modified bentonite clay that effectively lowers the phosphate concentration in surface waters. The reaction mechanism involves binding of phosphate anions with the lanthanum ions in a molar ratio of 1:1 and thus forming lanthanum phosphate (rhabdophane). A characteristic feature of this reaction is that the rhabdophane may be formed when concentrations of La3+ and −34PO are low. Research on the use of Phoslock in phosphate reduction revealed that the complex of lanthanum and phosphate may occur in the pH range 5÷9. It was also found that the rate of adsorption rate increased at higher temperatures. This article studied the kinetics of adsorption of phosphate ions with Phoslock described by the equation of reaction rateof pseudo-second order. Article presents results of research on the effectiveness/efficiency of Phoslock when using water properly prepared in laboratory, and comparatively, natural water coming from the artificial lake Rochna which is used for recreational purposes. Lake Rochna is situated about 30 km from the city of Lodz. Results indicate that the process of adsorption of phosphate ions occurred more intensively in the pre-made model water than in natural water.