Sustainable wastewater network management in Lempäälä Municipality
Obijaju, Peter (2012)
Obijaju, Peter
Tampereen ammattikorkeakoulu
2012
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2012053110945
https://urn.fi/URN:NBN:fi:amk-2012053110945
Tiivistelmä
Deterioration of a wastewater network can be attributed to a number of factors, from aging and damaged infrastructure (pipes, manholes and pump stations), to seismic activity and human activities. This deterioration can cause huge problems in a wastewater network, including leakage of water into the network, which can cause overflow and an increase in the cost of transporting and treating the wastewater.
The aim of this study was to determine the level of deterioration in the sewer network of Lempäälä municipality by investigating the different areas connected to the wastewater network. The work was conducted by investigating the network for Inflow and Infiltration (I&I) flow rate in different areas of the Municipality connected to the wastewater network. An additional aim was to assess the increase in cost of transporting wastewater from pump stations to the treatment plant.
Monthly flow of I&I was calculated for each of the pump stations around Lempäälä. The average wastewater flow rate information for Wet (Peak) periods and Dry (Off-peak) periods was taken from the water supply department data base. The Peak wastewater flow rate period was taken in the month of April and the Off-peak period wastewater flow rate was taken in June, both in 2010.
Information for this study was gathered from field investigation of the manholes, pump stations and pipes with the aid of a closed circuit television (CCTV). About 700 man-holes were investigated and only faulty ones were documented. Additionally, 52 pump stations were investigated.
This research revealed the difference in cost of transporting wastewater from the pump stations via the networks to the treatment plant for the Peak and Off-peak periods. The field results would be used to renovate the wastewater network in 2011-2012.
The aim of this study was to determine the level of deterioration in the sewer network of Lempäälä municipality by investigating the different areas connected to the wastewater network. The work was conducted by investigating the network for Inflow and Infiltration (I&I) flow rate in different areas of the Municipality connected to the wastewater network. An additional aim was to assess the increase in cost of transporting wastewater from pump stations to the treatment plant.
Monthly flow of I&I was calculated for each of the pump stations around Lempäälä. The average wastewater flow rate information for Wet (Peak) periods and Dry (Off-peak) periods was taken from the water supply department data base. The Peak wastewater flow rate period was taken in the month of April and the Off-peak period wastewater flow rate was taken in June, both in 2010.
Information for this study was gathered from field investigation of the manholes, pump stations and pipes with the aid of a closed circuit television (CCTV). About 700 man-holes were investigated and only faulty ones were documented. Additionally, 52 pump stations were investigated.
This research revealed the difference in cost of transporting wastewater from the pump stations via the networks to the treatment plant for the Peak and Off-peak periods. The field results would be used to renovate the wastewater network in 2011-2012.