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Bevattning med avloppsvatten : en hydrogeologisk studie

Hagman, Mats (1994) In Examensarbeten i geologi vid Lunds universitet
Department of Geology
Abstract
During the last decades the municipals in
Sweden has intensified their efforts to find
alternative uses for the wastewater produced
within the municipality. In Svalöv, Scania,
a pilot-plant started in collabaration
with Svalöf Weibulls AB to cultivate energy
forest by wastewater irrigation. The vegetation
is thus supplied with nutrious fertilazing
at the same time as a purification of
the wastewater takes place in the soil horizon.
The aim with this study is to determine
the geological/ hydrogeological build-up of
the test area and to discuss the possibilities
of groundwater contamination.
The geological field investigations
around the pilot-plant show that paleozoic
shale is covered by postglacial clayey/silty
flood-plain... (More)
During the last decades the municipals in
Sweden has intensified their efforts to find
alternative uses for the wastewater produced
within the municipality. In Svalöv, Scania,
a pilot-plant started in collabaration
with Svalöf Weibulls AB to cultivate energy
forest by wastewater irrigation. The vegetation
is thus supplied with nutrious fertilazing
at the same time as a purification of
the wastewater takes place in the soil horizon.
The aim with this study is to determine
the geological/ hydrogeological build-up of
the test area and to discuss the possibilities
of groundwater contamination.
The geological field investigations
around the pilot-plant show that paleozoic
shale is covered by postglacial clayey/silty
flood-plain deposits with a various amounts
of organic material. The thickness of the
flood-plain deposits is between 1,15- 2,2
meter. An aquifer was found in the flood-plain
deposits and it probably continues
down in the crushed upper zone of the shale.
The hydrological field investigations around
the pilot-plant indicate that the major part of
the groundwater flow take place in the crushed
upper zone of the shale. During winter,
the flow is directed towards the Vegeå river.
Infiltration tests showed a fairly low infiltration
capacity in the soil horizon, which
strongly indicates that most of the groundwater
recharge take place higher up in the
terrain.
Considering the results from the geological/
hydrogeological field investigations,
the location of the pilot-plant is well chosen.
The low-permeability soil around the
pilot-plant has all the qualifications for a
proportionally long detention-time in the
aerobic zone during the infiltration/percolation
process. This contributes to an effective
purification of the wastewater in the soil horizon.
The spreading direction of possible
contaminents from the wastewater is limited,
as the groundwater flow is directed towards
the Vegeå river.
With groundwater flow towards the river,
the risk is insignificant, that the contaminents
reach the areable acreages to any
large extents. With a single-directed
groundwater flow its also easy to measure
the quantity of the contaminents. This can
be done from groundwater pipes between
the river and the pilot-plant.
Since this investigation was carried out
during winter, some questions still remain
unanswered. Continued investigations
should deal with groundwater flow directions
during summer and investigate the
spreading and dilution of possible contaminents.
For this purpose the following measures
should be taken:
• Installation of groundwater pipes down into
the shale.
• Continous sampling of groundwater during
the irrigation season. (Less)
Please use this url to cite or link to this publication:
author
Hagman, Mats
supervisor
organization
year
type
M2 - Bachelor Degree
subject
keywords
geografi, geologi, hydrogeologi, bevattning, avloppsvatten
publication/series
Examensarbeten i geologi vid Lunds universitet
report number
61
language
Swedish
additional info
Hans Jeppson, VBB Viak.
id
2370060
date added to LUP
2012-03-09 10:18:58
date last changed
2012-10-22 10:57:11
@misc{2370060,
  abstract     = {During the last decades the municipals in
Sweden has intensified their efforts to find
alternative uses for the wastewater produced
within the municipality. In Svalöv, Scania,
a pilot-plant started in collabaration
with Svalöf Weibulls AB to cultivate energy
forest by wastewater irrigation. The vegetation
is thus supplied with nutrious fertilazing
at the same time as a purification of
the wastewater takes place in the soil horizon.
The aim with this study is to determine
the geological/ hydrogeological build-up of
the test area and to discuss the possibilities
of groundwater contamination.
The geological field investigations
around the pilot-plant show that paleozoic
shale is covered by postglacial clayey/silty
flood-plain deposits with a various amounts
of organic material. The thickness of the
flood-plain deposits is between 1,15- 2,2
meter. An aquifer was found in the flood-plain
deposits and it probably continues
down in the crushed upper zone of the shale.
The hydrological field investigations around
the pilot-plant indicate that the major part of
the groundwater flow take place in the crushed
upper zone of the shale. During winter,
the flow is directed towards the Vegeå river.
Infiltration tests showed a fairly low infiltration
capacity in the soil horizon, which
strongly indicates that most of the groundwater
recharge take place higher up in the
terrain.
Considering the results from the geological/
hydrogeological field investigations,
the location of the pilot-plant is well chosen.
The low-permeability soil around the
pilot-plant has all the qualifications for a
proportionally long detention-time in the
aerobic zone during the infiltration/percolation
process. This contributes to an effective
purification of the wastewater in the soil horizon.
The spreading direction of possible
contaminents from the wastewater is limited,
as the groundwater flow is directed towards
the Vegeå river.
With groundwater flow towards the river,
the risk is insignificant, that the contaminents
reach the areable acreages to any
large extents. With a single-directed
groundwater flow its also easy to measure
the quantity of the contaminents. This can
be done from groundwater pipes between
the river and the pilot-plant.
Since this investigation was carried out
during winter, some questions still remain
unanswered. Continued investigations
should deal with groundwater flow directions
during summer and investigate the
spreading and dilution of possible contaminents.
For this purpose the following measures
should be taken:
• Installation of groundwater pipes down into
the shale.
• Continous sampling of groundwater during
the irrigation season.},
  author       = {Hagman, Mats},
  keyword      = {geografi,geologi,hydrogeologi,bevattning,avloppsvatten},
  language     = {swe},
  note         = {Student Paper},
  series       = {Examensarbeten i geologi vid Lunds universitet},
  title        = {Bevattning med avloppsvatten : en hydrogeologisk studie},
  year         = {1994},
}