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Investigation of Readily Degradable Carbon Source Production by Hydrolyzing Sludge and Reject water at Ängen planned WWTP

Pranoto, Kartika Novitasari LU (2020) In Master Thesis VVAM05 20201
Chemical Engineering (M.Sc.Eng.)
Abstract
As form of effort to mitigate the increase of pollution level that caused by human activity, Ängen wastewater treatment plant (WWTP) will be built in Lidköping as part of the European LIFE project (LIWE LIFE). Ängen WWTP will be operated based on enhanced biological phosphorus removal (EBPR) technology. This treatment plant is projected to be cost effective and resource efficient, therefore this treatment plant will rely on the biological process to recover the energy and the resources from the treatment plant’s stream. In EBPR technology, a readily degradable carbon source availability is needed to have an efficient removal process.
To maintain the removal process the availability of readily degradable carbon source is need to be... (More)
As form of effort to mitigate the increase of pollution level that caused by human activity, Ängen wastewater treatment plant (WWTP) will be built in Lidköping as part of the European LIFE project (LIWE LIFE). Ängen WWTP will be operated based on enhanced biological phosphorus removal (EBPR) technology. This treatment plant is projected to be cost effective and resource efficient, therefore this treatment plant will rely on the biological process to recover the energy and the resources from the treatment plant’s stream. In EBPR technology, a readily degradable carbon source availability is needed to have an efficient removal process.
To maintain the removal process the availability of readily degradable carbon source is need to be fulfilled. Volatile fatty acids (VFAs) are readily degradable carbon that results from the hydrolysis process on the sludge mixture. By introducing the VFAs back to the EBPR system, the necessity of the readily degradable carbon source can be fulfilled.
This study is investigating the impact of the sludge mixture on the hydrolysis yield, rate, and
VFAs production. The sludge mixture used was activated sludge (AS) / primary sludge (PS)
and activated sludge (AS) / reject water (RW) from the primary sludge thickener. The sludge
mixture was hydrolyzed for 10 days under temperature 13oC. The experiment with AS/PS mixture resulting in higher hydrolysis rate, hydrolysis yield, and VFAs production compared to the experiment with the AS/RW mixture. The highest hydrolysis rate and hydrolysis yield were generated by 50% AS : 50% PS composition. The hydrolysis yield rate is 84 mg/g TS and 0.44 mg/g TS×h-1 respectively. The highest hydrolysis rate and hydrolysis yield that was obtained by AS/RW are 38-40 mg/g TS and 0.21-0.23 mg/g TS×h-1 respectively by adding 5-10% of reject water in the experiment.The sludge mixture with more primary sludge composition is producing more VFAs and less phosphate (PO43-) and ammonia (NH4+). While the sludge with more activated sludge composition generating more phosphate (PO43-) and ammonia (NH4+) and fewer VFAs. The small amount of reject water addition in the experiment batch is improving the hydrolysis and generating more VFAs compared to the VFAs generated by only activated sludge. This result shows the potential and the benefits of the sludge mixture hydrolysis to achieve the cost effective and resources efficient wastewater treatment plant. (Less)
Popular Abstract
Wastewater treatment in Sweden has been developed since the late 1800s to mitigate the pollution problem caused by human activity. One of the biggest pollution problems that have been the eutrophication caused by nutrients such as phosphorus and ammonium in the water body. The wastewater treatment process is an expensive process; therefore, it is very important to develop an energy effective and resources efficient treatment plant.
Enhanced Biological Phosphorus Removal (EBPR) is one of the best technologies on phosphorus removal. EBPR efficiency on phosphorus removal process can reach 97%. This process relies on enhancing the Polyphosphate Accumulating Organisms (PAOs) ability to remove the phosphorus in the wastewater. The removal... (More)
Wastewater treatment in Sweden has been developed since the late 1800s to mitigate the pollution problem caused by human activity. One of the biggest pollution problems that have been the eutrophication caused by nutrients such as phosphorus and ammonium in the water body. The wastewater treatment process is an expensive process; therefore, it is very important to develop an energy effective and resources efficient treatment plant.
Enhanced Biological Phosphorus Removal (EBPR) is one of the best technologies on phosphorus removal. EBPR efficiency on phosphorus removal process can reach 97%. This process relies on enhancing the Polyphosphate Accumulating Organisms (PAOs) ability to remove the phosphorus in the wastewater. The removal efficiency requires the availability of readily degradable carbon source such as Volatile Fatty Acids (VFAs). To create an efficient treatment plant, it is necessary to recover the resources such as VFAs through a resource recovery process.
Hydrolysis is a degradation process that breaks down the organic matter into smaller substances (VFAs). The VFAs production is depended in the sludge composition, temperature, and pH. Primary sludge is rich in organic matter, and very beneficial for energy recovery by producing methane. Activated sludge in the EBPR process is rich with PAOs. The combination of these two sludges is beneficial to generate VFAs and nutrients. In the other hand, reject water from primary sludge thickener is having the lowest organic matter content compared to activated sludge and primary sludge.
What we have done in this study? In this study, we investigated which sludge composition that generating the most VFAs. Two experiments with different sludge mixture were hydrolyzed for 10 days to provide the data about the carbon
recovery possibility. The first experiment was using the sludge mixture that contains activated sludge and primary sludge with various concentration. The second experiment was using the mixture that contains activated sludge and reject water with various concentration. This study concludes that activated sludge and primary sludge mixture generated the most VFAs. Addition of a certain amount reject water is beneficial for the hydrolysis process. Addition of 10% reject water into activated sludge mixture generates more VFAs than 100% activated sludge. (Less)
Please use this url to cite or link to this publication:
author
Pranoto, Kartika Novitasari LU
supervisor
organization
alternative title
Carbon Source Recovery on Wastewater Treatment Plant
course
VVAM05 20201
year
type
H2 - Master's Degree (Two Years)
subject
keywords
EBPR, activated sludge, primary sludge, reject water, hydrolysis rate, hydrolysis yield, VFAs, pH, water engineering, environmental engineering, vattenförsörjningsteknik, avloppsteknik
publication/series
Master Thesis
report number
2020-07
language
English
id
9020200
date added to LUP
2020-06-22 16:03:45
date last changed
2020-06-22 16:03:45
@misc{9020200,
  abstract     = {As form of effort to mitigate the increase of pollution level that caused by human activity, Ängen wastewater treatment plant (WWTP) will be built in Lidköping as part of the European LIFE project (LIWE LIFE). Ängen WWTP will be operated based on enhanced biological phosphorus removal (EBPR) technology. This treatment plant is projected to be cost effective and resource efficient, therefore this treatment plant will rely on the biological process to recover the energy and the resources from the treatment plant’s stream. In EBPR technology, a readily degradable carbon source availability is needed to have an efficient removal process.
To maintain the removal process the availability of readily degradable carbon source is need to be fulfilled. Volatile fatty acids (VFAs) are readily degradable carbon that results from the hydrolysis process on the sludge mixture. By introducing the VFAs back to the EBPR system, the necessity of the readily degradable carbon source can be fulfilled.
This study is investigating the impact of the sludge mixture on the hydrolysis yield, rate, and
VFAs production. The sludge mixture used was activated sludge (AS) / primary sludge (PS)
and activated sludge (AS) / reject water (RW) from the primary sludge thickener. The sludge
mixture was hydrolyzed for 10 days under temperature 13oC. The experiment with AS/PS mixture resulting in higher hydrolysis rate, hydrolysis yield, and VFAs production compared to the experiment with the AS/RW mixture. The highest hydrolysis rate and hydrolysis yield were generated by 50% AS : 50% PS composition. The hydrolysis yield rate is 84 mg/g TS and 0.44 mg/g TS×h-1 respectively. The highest hydrolysis rate and hydrolysis yield that was obtained by AS/RW are 38-40 mg/g TS and 0.21-0.23 mg/g TS×h-1 respectively by adding 5-10% of reject water in the experiment.The sludge mixture with more primary sludge composition is producing more VFAs and less phosphate (PO43-) and ammonia (NH4+). While the sludge with more activated sludge composition generating more phosphate (PO43-) and ammonia (NH4+) and fewer VFAs. The small amount of reject water addition in the experiment batch is improving the hydrolysis and generating more VFAs compared to the VFAs generated by only activated sludge. This result shows the potential and the benefits of the sludge mixture hydrolysis to achieve the cost effective and resources efficient wastewater treatment plant.},
  author       = {Pranoto, Kartika Novitasari},
  keyword      = {EBPR,activated sludge,primary sludge,reject water,hydrolysis rate,hydrolysis yield,VFAs,pH,water engineering,environmental engineering,vattenförsörjningsteknik,avloppsteknik},
  language     = {eng},
  note         = {Student Paper},
  series       = {Master Thesis},
  title        = {Investigation of Readily Degradable Carbon Source Production by Hydrolyzing Sludge and Reject water at Ängen planned WWTP},
  year         = {2020},
}