A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Hydrochemical Aspects of Riverbank Filtration in Vietnam
Riverbank filtration (RBF) is defined as the infiltration of river water into the aquifer. It can either be induced by pumping or as a result of a losing river stretch. It is used worldwide as a pre-treatment technique for surface water, which allows for lower abstraction of groundwater and usually an increase in the infiltrated water (bank filtrate) quality. In Vietnam, RBF offers a potential alternative to reduce groundwater overexploitation and an effective pre-treatment for the high turbidity characteristic of Vietnam’s rivers. However, a few water quality problems may arise during RBF, mainly caused by the development of reducing conditions during infiltration, which may trigger in particular conditions the mobilization of manganese, iron, arsenic and ammonium. Arsenic is typically a regional problem in groundwater/bank filtrate and therefore not an issue in the majority of RBF sites. However, the Red River Delta (RRD) in north Vietnam is one of the regions affected by geogenic arsenic contamination. Arsenic alongside with ammonium, are two of the biggest water quality issues in the RRD and are therefore the main points of investigation of this thesis. Ammonium is an undesirable substance in the abstracted water of RBF schemes, due mainly to the complications it causes during post-treatment. A literature review of case studies from 40 RBF sites around the world was done. Typical concentrations of ammonium in the bank filtrate are between 0.1 and 1.7 mg/l. The most common source of ammonium in the bank filtrate was found to be the mineralization of organic nitrogen occurring in the riverbed, while the most common sink of ammonium was nitrification in the riverbed. Ammonium surface water concentrations do not directly translate to abstracted concentrations. Transformations in the riverbed play a critical role in determining ammonium concentrations, whereby riverbeds with high amounts of organic material in the riverbed lead to higher mineralization rates and have more electron donor competitors, thus limiting ...
Hydrochemical Aspects of Riverbank Filtration in Vietnam
Riverbank filtration (RBF) is defined as the infiltration of river water into the aquifer. It can either be induced by pumping or as a result of a losing river stretch. It is used worldwide as a pre-treatment technique for surface water, which allows for lower abstraction of groundwater and usually an increase in the infiltrated water (bank filtrate) quality. In Vietnam, RBF offers a potential alternative to reduce groundwater overexploitation and an effective pre-treatment for the high turbidity characteristic of Vietnam’s rivers. However, a few water quality problems may arise during RBF, mainly caused by the development of reducing conditions during infiltration, which may trigger in particular conditions the mobilization of manganese, iron, arsenic and ammonium. Arsenic is typically a regional problem in groundwater/bank filtrate and therefore not an issue in the majority of RBF sites. However, the Red River Delta (RRD) in north Vietnam is one of the regions affected by geogenic arsenic contamination. Arsenic alongside with ammonium, are two of the biggest water quality issues in the RRD and are therefore the main points of investigation of this thesis. Ammonium is an undesirable substance in the abstracted water of RBF schemes, due mainly to the complications it causes during post-treatment. A literature review of case studies from 40 RBF sites around the world was done. Typical concentrations of ammonium in the bank filtrate are between 0.1 and 1.7 mg/l. The most common source of ammonium in the bank filtrate was found to be the mineralization of organic nitrogen occurring in the riverbed, while the most common sink of ammonium was nitrification in the riverbed. Ammonium surface water concentrations do not directly translate to abstracted concentrations. Transformations in the riverbed play a critical role in determining ammonium concentrations, whereby riverbeds with high amounts of organic material in the riverbed lead to higher mineralization rates and have more electron donor competitors, thus limiting ...
Hydrochemical Aspects of Riverbank Filtration in Vietnam
2023-08-03
Theses
Electronic Resource
English
DDC:
690
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