Peer-Reviewed Journal Details
Mandatory Fields
Murnane, J.G., Fenton, O., Healy, M.G.
Journal Of Environmental Management
Impacts of zeolite, alum and polyaluminium chloride amendments mixed with agricultural wastes on soil column leachate, and CO2 and CH4 emissions.
Optional Fields
Greenhouse gas emissions, slurry, chemical amendment; leachate; leaching; column study; soil
This study aimed to quantify leaching losses of nitrogen (N), phosphorus (P) and carbon (C), as well as carbon dioxide (CO2) and methane (CH4) emissions from stored slurry and from packed soil columns surface applied with unamended and chemically amended dairy and pig slurries and dairy soiled water (DSW). The amendments to the wastewaters, which were applied individually and together, were: poly-aluminum chloride (PAC) and zeolite for pig and dairy slurry, and liquid aluminium sulphate (alum) and zeolite for DSW. The columns were irrigated twice weekly and the leachate collected weekly for nineteen weeks after slurry application. Application of pig slurry resulted in the highest total nitrogen (TN) and nitrate-nitrogen (NO3-N) fluxes (22 and 12 kg ha-1), whereas corresponding fluxes from dairy slurries and DSW were not significantly (p<0.05) higher than those from the control soil. There were no significant (p<0.05) differences in leachate N losses between unamended and amended dairy slurries, unamended and amended pig slurries, and unamended and amended DSW. There were no leachate P losses measured over the experimental duration. Total cumulative organic and inorganic C losses in leachate were highest for unamended dairy slurry (82 and 142 kg ha-1), and these were significantly (p<0.05) reduced when amended with PAC (38 and 104 kg ha-1) and with PAC and zeolite (43 and 119 kg ha-1). The highest average cumulative CO2 emissions for all treatments were measured for pig slurries (680 kg CO2-C ha-1) followed by DSW (515 kg CO2-C ha-1) and dairy slurries (486 kg CO2-C ha-1). The results indicate that pig slurry, either in raw or chemically amended form, poses the greatest environmental threat of leaching losses and gaseous emissions of CO2 and CH4 and, in general, amendment of wastewater with PAC, alum or zeolite, does not mitigate the risk of leaching losses and gaseous emissions.
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