TY - JOUR
T1 - Forecasting saltwater intrusion volume and sulfate content in a wastewater collection system. Case study: Barreiro/Moita WWTP, Portugal
AU - Figueiredo, Ana S.
AU - Amaral, Leonor
AU - Pacheco, J.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - The presence of salt water from the Tagus Estuary has been identified in the influent at Barreiro/Moita Wastewater Treatment Plant (WWTP), Portugal. The intrusion occurs throughout damaged sections and direct vectors in the wastewater collection system, during high tide levels, changing the wastewater characteristics and impacting the WWTP process. This study designed models to quantify this problem, enabling more effective countermeasures within the right timing. The proposed models estimate the average volume of salt water and sulfate (SO24) load for each high tide period. The laboratory results show strong correlations between the influent electrical conductivity (EC) and percentage of salt water in WWTP inflow (0.9909), and between EC and SO24 concentration in WWTP influent (0.9797). The forecast models also show good correlation between the high tide levels with volume of salt water (0.9145) and SO24 load (0.9162) entering the system. Considering the total monthly inflow, the highest percentage of salt water registered in WWTP inflow was 3.6%. During high tide periods, critical situations have been assessed with up to 53.9% of salt water in the WWTP inflow, increasing energy consumption and costs in pumping stations.
AB - The presence of salt water from the Tagus Estuary has been identified in the influent at Barreiro/Moita Wastewater Treatment Plant (WWTP), Portugal. The intrusion occurs throughout damaged sections and direct vectors in the wastewater collection system, during high tide levels, changing the wastewater characteristics and impacting the WWTP process. This study designed models to quantify this problem, enabling more effective countermeasures within the right timing. The proposed models estimate the average volume of salt water and sulfate (SO24) load for each high tide period. The laboratory results show strong correlations between the influent electrical conductivity (EC) and percentage of salt water in WWTP inflow (0.9909), and between EC and SO24 concentration in WWTP influent (0.9797). The forecast models also show good correlation between the high tide levels with volume of salt water (0.9145) and SO24 load (0.9162) entering the system. Considering the total monthly inflow, the highest percentage of salt water registered in WWTP inflow was 3.6%. During high tide periods, critical situations have been assessed with up to 53.9% of salt water in the WWTP inflow, increasing energy consumption and costs in pumping stations.
KW - Electrical conductivity
KW - Forecasting models
KW - Saltwater intrusion
KW - Undue inflow
KW - Wastewater collection system
KW - Wastewater treatment plant (WWTP)
UR - http://www.scopus.com/inward/record.url?scp=85121783535&partnerID=8YFLogxK
U2 - 10.2166/wcc.2021.375
DO - 10.2166/wcc.2021.375
M3 - Article
AN - SCOPUS:85121783535
SN - 2040-2244
VL - 12
SP - 3648
EP - 3660
JO - Journal of Water and Climate Change
JF - Journal of Water and Climate Change
IS - 8(SI)
ER -