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Key Data Set Information
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Location
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CN
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Name
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Municipal sludge treatment and disposal;dry sludge;cement manufacturing
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Use advice for data set
| When applying this data within a Life Cycle Assessment framework, users should ensure that the functional unit of one ton of dry sludge (1 t-DS) is consistently used throughout their analysis to maintain accuracy. Attention should be paid to any potential differences in sludge characteristics specific to the region or the processing facility in question. Additionally, users must consider any environmental impacts associated with the transportation of sludge to the cement plant, as well as the emissions resulting from the co-processing of sludge in the cement manufacturing process. |
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Technical purpose of product or process
| The dried sludge referred to in this Life Cycle Assessment data is intended for utilization in the cement manufacturing process as an alternative fuel or raw material (AFR). The process data represents the treatment and disposal of municipal sludge which, after being dried, is utilized within the cement industry to either partially replace conventional fuels or serve as a supplement to raw materials due to its calorific value and material composition. |
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Classification
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Class name
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Hierarchy level
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| Several typical sludge treatment facilities in China, representing anaerobic digestion, composting, co-combustion, thermal drying-incineration, and cement production, respectively, are selected to carry out the inventory. Data are mainly taken from the site-specific measurement, either by field survey or by operation report. Sludge characteristics are based on the average values of the sites investigated. |
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Copyright
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No
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Owner of data set
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Quantitative reference
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Reference flow(s)
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Functional Unit
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One ton of sludge on a dry basis (1 t-DS) is defined as the functional unit.
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Technological representativeness
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Technology description including background system
| Sludge is first dried to 15% using the waste heat from the rotary kiln. Afterward, it is combusted at 1400 °C with other feedstock (1.6 tons of coal, 15.8 tons of limestone, 1.6 tons of iron ore, and 1.4 tons of clay per dried ton of sludge) to produce cement. |