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Sludge Dehydration Technologies
INTRODUCTION
Dewatering is a physical process integrated in the sludge line of treatment plant. It is aimed at reducing the water content and therefore the sludge volume. In this way, its transportation costs to the final destination point is reduced. On the other hand, the dewatered sludge is easier to handle and the transport process is more convenient than in the case of a sludge with higher water content.
The dewatering technique chosen must be consistent with the amount and characteristics of sludges generated and with the biosolid final destination.
Water present in the sludge exists in four forms (see figure): free, colloidal, intercellular and capillary. Free water can be separated from sludge by gravity as it is not associated with solids. Chemical conditioning prior to the use of mechanical tools is required in order to remove colloidal and capillary water. For intercellular water removal, the structure containing it must be broken and this can be done through heat treatment.
Sludge Dehydration Technologies
INTRODUCTION
Dewatering is a physical process integrated in the sludge line of treatment plant. It is aimed at reducing the water content and therefore the sludge volume. In this way, its transportation costs to the final destination point is reduced. On the other hand, the dewatered sludge is easier to handle and the transport process is more convenient than in the case of a sludge with higher water content.
The dewatering technique chosen must be consistent with the amount and characteristics of sludges generated and with the biosolid final destination.
Water present in the sludge exists in four forms (see figure): free, colloidal, intercellular and capillary. Free water can be separated from sludge by gravity as it is not associated with solids. Chemical conditioning prior to the use of mechanical tools is required in order to remove colloidal and capillary water. For intercellular water removal, the structure containing it must be broken and this can be done through heat treatment.
Odor Control
20 years ago there was little talk of odor control. WWTP’s and PS were located out of town, and odor was not a problem.
Today odor control is generally considered an essential process in sewage treatment plant design, and in many other industries.
Odor Control
20 years ago there was little talk of odor control. WWTP’s and PS were located out of town, and odor was not a problem.
Today odor control is generally considered an essential process in sewage treatment plant design, and in many other industries.
Energy from Wastewater Sewage Sludge in Lebanon
The Ministry of Energy and Water (MEW) and the Council for Development and Reconstruction (CDR) are considering investing in energy produced from
wastewater sludge through anaerobic digestion (AD). Currently, Lebanon has only a few constructed wastewater treatment plants (WWTPs), however many
others are either under construction, under designphase assessment, or are envisioned to be assessed in the future. The goal of this study is to undergo a feasibility assessment to identify the WWTPs that meet the conditions to implement AD and elaborate the related technical specifications.
Energy from Wastewater Sewage Sludge in Lebanon
The Ministry of Energy and Water (MEW) and the Council for Development and Reconstruction (CDR) are considering investing in energy produced from
wastewater sludge through anaerobic digestion (AD). Currently, Lebanon has only a few constructed wastewater treatment plants (WWTPs), however many
others are either under construction, under designphase assessment, or are envisioned to be assessed in the future. The goal of this study is to undergo a feasibility assessment to identify the WWTPs that meet the conditions to implement AD and elaborate the related technical specifications.
Sewage Sludge Management In Germany
Introduction
What is sewage sludge?
In Germany, daily water use now reaches 120 litres per person. All of this water ultimately ends up in the sewage system, and from there is channelled to sewage treatment plants. At such plants, the sewage passes through screens and sieves and undergoes mechanical and biological purification,
the goal being to remove impurities from the sewage and to then channel the resulting purified water into waterbodies. The residue of this process is known as
sewage sludge, which can occur in anhydrous, dried or other processed forms.
Sewage Sludge Management In Germany
Introduction
What is sewage sludge?
In Germany, daily water use now reaches 120 litres per person. All of this water ultimately ends up in the sewage system, and from there is channelled to sewage treatment plants. At such plants, the sewage passes through screens and sieves and undergoes mechanical and biological purification,
the goal being to remove impurities from the sewage and to then channel the resulting purified water into waterbodies. The residue of this process is known as
sewage sludge, which can occur in anhydrous, dried or other processed forms.
Activated Sludge Aeration Waste Heat for Membrane Evaporation of Desalination Brine Concentrate: A Bench Scale Collaborative Study
This study examines a potential membrane evaporation process to reduce brine concentrate volume at the San Antonio Water System’s (SAWS) 45.4 million liters per day (MLD) brackish water desalination facility in San Antonio, Texas, which is currently being constructed. This facility is a reverse osmosis (RO) process operating with 90% recovery by blending 37.9 MLD of permeate with 7.6 MLD of bypass water, producing 4.2 MLD of brine concentrate. The brine concentrate residuals are to be disposed of through deep-well injection. The deep-well injection process is anticipated to be expensive due to well-drilling costs and maintenance costs of operating at high injection pressures. Membrane evaporation systems are promising because they are compact systems and they can be used with low grade waste heat energy sources. This study investigates the potential of coupling membrane evaporation with waste heat generated from activated sludge aeration blowers.
Activated Sludge Aeration Waste Heat for Membrane Evaporation of Desalination Brine Concentrate: A Bench Scale Collaborative Study
This study examines a potential membrane evaporation process to reduce brine concentrate volume at the San Antonio Water System’s (SAWS) 45.4 million liters per day (MLD) brackish water desalination facility in San Antonio, Texas, which is currently being constructed. This facility is a reverse osmosis (RO) process operating with 90% recovery by blending 37.9 MLD of permeate with 7.6 MLD of bypass water, producing 4.2 MLD of brine concentrate. The brine concentrate residuals are to be disposed of through deep-well injection. The deep-well injection process is anticipated to be expensive due to well-drilling costs and maintenance costs of operating at high injection pressures. Membrane evaporation systems are promising because they are compact systems and they can be used with low grade waste heat energy sources. This study investigates the potential of coupling membrane evaporation with waste heat generated from activated sludge aeration blowers.
Enhanced Anaerobic Digestion and Hydrocarbon Precursor Production from Sewage Sludge
. Ultimate Goal: Transform negative-value or low-value biosolids into high-energy-density, fungible hydrocarbon precursors.
.Enables sustainable production of biogas that is considered as a cellulosic biofuel under new RFS2 (EPA, July 2014).
.Addresses DOE's goals of development of cost-competitive and sustainable biofuels by advancing efficient production strategies for drop-in biofuels.
Enhanced Anaerobic Digestion and Hydrocarbon Precursor Production from Sewage Sludge
. Ultimate Goal: Transform negative-value or low-value biosolids into high-energy-density, fungible hydrocarbon precursors.
.Enables sustainable production of biogas that is considered as a cellulosic biofuel under new RFS2 (EPA, July 2014).
.Addresses DOE's goals of development of cost-competitive and sustainable biofuels by advancing efficient production strategies for drop-in biofuels.
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