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A Reacidification Model for Acidified Lakes Neutralized With Calcite

Sverdrup, Harald LU and Warfvinge, Per LU (1985) In Water Resources Research 21(9). p.1374-1380
Abstract
In lake liming operations in Sweden, acidified lakes are reclaimed by neutralization with calcite powder. The amount added is intended to neutralize the water column as well as to delay the reacidification. The reacidification of limed lakes is dependent on the dilution of the dissolved calcium carbonate with time and, for a limited period of time, the dissolution of calcite from the lake sediments. Calcite on the lake bottom will, in addition to being covered by sedimentation, become inactivated by precipitates of humus and clay minerals clogging the calcite surfaces. A model has been developed to calculate the reacidification of a limed lake which includes the following mechanisms: (1) the dissolution of calcite and a subsequent... (More)
In lake liming operations in Sweden, acidified lakes are reclaimed by neutralization with calcite powder. The amount added is intended to neutralize the water column as well as to delay the reacidification. The reacidification of limed lakes is dependent on the dilution of the dissolved calcium carbonate with time and, for a limited period of time, the dissolution of calcite from the lake sediments. Calcite on the lake bottom will, in addition to being covered by sedimentation, become inactivated by precipitates of humus and clay minerals clogging the calcite surfaces. A model has been developed to calculate the reacidification of a limed lake which includes the following mechanisms: (1) the dissolution of calcite and a subsequent neutralization of acid water, (2) owing to the increase inpH value, occurrence of precipitation of humus and dissolved metals onto the calcite surface and inhibition of the dissolution of calcite (3) reversible sorbtion of calcium from the water column by sediments not covered with calcite, and (4) diffusive transport through a boundary bottom layer to the water column. In a first approach the lake was modeled as a continuously stirred tank. The equations were derived from a mass balance and the dissolution kinetics for calcite to describe the long-term development ofpH, alkalinity, and calcium concentration in the lake. The differential equations describing the mechanisms were solved with the help of a computer code. The model accurately describes the reacidification and the mass balances observed in several limed lakes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Water Resources Research
volume
21
issue
9
pages
1374 - 1380
publisher
American Geophysical Union
external identifiers
  • wos:A1985AQY3700010
  • scopus:0022264516
ISSN
0043-1397
DOI
10.1029/WR021i009p01374
language
English
LU publication?
yes
id
2e810047-d003-4e82-9751-7602dda487f5 (old id 3918128)
date added to LUP
2013-07-05 08:49:16
date last changed
2017-01-01 06:39:54
@article{2e810047-d003-4e82-9751-7602dda487f5,
  abstract     = {In lake liming operations in Sweden, acidified lakes are reclaimed by neutralization with calcite powder. The amount added is intended to neutralize the water column as well as to delay the reacidification. The reacidification of limed lakes is dependent on the dilution of the dissolved calcium carbonate with time and, for a limited period of time, the dissolution of calcite from the lake sediments. Calcite on the lake bottom will, in addition to being covered by sedimentation, become inactivated by precipitates of humus and clay minerals clogging the calcite surfaces. A model has been developed to calculate the reacidification of a limed lake which includes the following mechanisms: (1) the dissolution of calcite and a subsequent neutralization of acid water, (2) owing to the increase inpH value, occurrence of precipitation of humus and dissolved metals onto the calcite surface and inhibition of the dissolution of calcite (3) reversible sorbtion of calcium from the water column by sediments not covered with calcite, and (4) diffusive transport through a boundary bottom layer to the water column. In a first approach the lake was modeled as a continuously stirred tank. The equations were derived from a mass balance and the dissolution kinetics for calcite to describe the long-term development ofpH, alkalinity, and calcium concentration in the lake. The differential equations describing the mechanisms were solved with the help of a computer code. The model accurately describes the reacidification and the mass balances observed in several limed lakes.},
  author       = {Sverdrup, Harald and Warfvinge, Per},
  issn         = {0043-1397},
  language     = {eng},
  number       = {9},
  pages        = {1374--1380},
  publisher    = {American Geophysical Union},
  series       = {Water Resources Research},
  title        = {A Reacidification Model for Acidified Lakes Neutralized With Calcite},
  url          = {http://dx.doi.org/10.1029/WR021i009p01374},
  volume       = {21},
  year         = {1985},
}