Nutrient leaching from carbon products of sludge

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27 Citations (Scopus)


We proposed pyrolysis as a promising optional technology for recycling-waste products, especially sewage sludge and animal-waste (manure). In this study, nutrient (nitrogen, phosphorous and potassium) leaching characteristics of carbon products mainly from sewage sludge and cattle waste were analyzed. Results are summarized as follows: 1) Electrical conductivity (EC) of carbon product solutes increase with time, and phosphate and sulfuric ions dissolve gradually from the carbon products of both sewage sludge and cattle waste; 2) Nitrogen decreases with manufacturing temperature and nutrient concentration of phosphorous and potassium are larger; Both phosphorous and potassium are citric soluble and easily available for crop production; and 3) The ratio of nitrogen to phosphorous and potassium can be controlled through the manufacturing temperature. These results provide valuable information for utilizing carbon products from waste products.

Original languageEnglish
Number of pages10
Publication statusPublished - Dec 1 2004
Externally publishedYes
EventASAE Annual International Meeting 2004 - Ottawa, ON, Canada
Duration: Aug 1 2004Aug 4 2004


OtherASAE Annual International Meeting 2004
CityOttawa, ON

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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