Abstract
As a typical organic solid waste, sludge plays an important role in contributing to greenhouse gas (GHG) emissions resulted by its treatment and disposal. As a temporary and emergent treatment measurement, sludge lime stabilization is regionally adopted in most sludge generated units in China. In present case, sludge lime stabilization system in China was productive of total GHG emissions, including indirect and direct emissions during lime stabilization and carbon reduction owing to lime synthesis and consumption, were first quantified respectively. The results indicated that electricity consumption was main component of indirect emissions, including mixing and transportation related mechanical equipment use. Direct emission was attributed to CO2 absorption during the second step in hydration reaction of lime stabilization. Meanwhile, a carbon credit portion of lime synthesis was also taken to the consideration of carbon budget. In brief, reduction in total replaceable carbon emission resulted by sludge lime treatment in comparison to landfill was calculated to be 0.8092 tCO2e·t−1. As treated production, lime-stabilized sludge is suggested to amend acidic soil for its revegetation. It is concluded that lime stabilization of sludge shows a significant GHG reduction effect despite of its temporary and emergent nature.
Highlights
It is often faced that high environmental risk and the lack of treatment facilities when more and more sludge is generated along with a large amounts of sewage daily, especially in some developing countries, such as China
In China, the water content of sludge is required to reduce below 60%, being qualified for landfill disposal, indirect greenhouse gas (GHG) emissions from electricity consumption on-site (PEelec,y) in present case was mainly attributed to sludge dewatering
Sludge lime stabilization should be considered objectively, the characteristics of sludge lime treatment should be divided into two parts
Summary
It is often faced that high environmental risk and the lack of treatment facilities when more and more sludge is generated along with a large amounts of sewage daily, especially in some developing countries, such as China. It is not realistic that such huge sludge can be timely treated by harmless measures and in recycling disposal ways. Under this background, some temporary, emergent and effective techniques arose. Lime stabilization is one of acceptable and regionally adopted in sludge treatment sites especially in north China. It is attributed to the facility absence of sludge treatment and recycling or the shortage of fund for the sludge treatments If this has happened, the GHG emissions of sludge lime stabilization should be had the initiative in our hands. The objective of this work is to make a quantization of GHG from sludge lime stabilization according to statistical data obtained in practical project and previous related research results. It is compared with GHG from baseline scenario of native sludge disposal to obtain the net GHG emissions of lime stabilization technique, proposing the position and the priority order of lime stabilization in the chain of GHG emissions sludge management
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