Coprecipitation of phosphate with calcite in lake water: A laboratory experiment modelling phosphorus removal with calcite in Lake Constance
1988; Elsevier BV; Volume: 22; Issue: 10 Linguagem: Inglês
10.1016/0043-1354(88)90113-3
ISSN1879-2448
Autores Tópico(s)Mine drainage and remediation techniques
ResumoThe precipitation of calcite from natural lake water was studied in laboratory experiments under controlled conditions; water from Lake Constance filtered through 0.2 μm membranes was used, temperature was 15°C, saturation index was adjusted to about 50 and calcium carbonate seed crystals of defined particle size were added. The reaction kinetics were monitored as graphs of d(Ca)/dt [or: d(pH)/dt, d(alkalinity)/dt, d(conductivity)/dt] and revealed reaction rates were dependent of the seed crystal concentration. During the growth of the calcite crystals, the phosphate coprecipitation rate was dependent on the crystallization velocity. From the rate law of coprecipitation of phosphate with calcite evaluated in our experiments, the potential impact of autochthonous calcite precipitation on the epilimnic phosphorus contents of Lake Constance was estimated. About 35% of the total P removal was calculated to be coprecipitated with calcite.
Referência(s)