Textile sludge application to non-productive soil: physico-chemical and phytotoxicity aspects.
As part of an assessment study on the risk of spreading textile sludge onto non-productive soil, the sorption behaviour of some sludge-metal constituents [Cr(VI), Cu(II), Pb(II), and Zn(II)] in the soil was studied. In addition, the sludge stabilization effect was evaluated by the biodegradation of organic compounds and phytotoxicity tests. Metal-soil sorption was assessed using soil columns and by sorption isotherms (i.e., Freundlich and Langmuir). In relation to the phytotoxicity of Eruca sativa L., there was a biomass inhibitory effect for the fresh sludge and a biomass stimulant effect for the stabilized sludge. Thus our results show that after stabilization, the tested loading ratio of 33% sludge: 67% soil (v/v) (equivalent to 85 Mg ha(-1)) did not significantly increase the risk of groundwater contamination since only small amounts of metals applied to the soil underwent percolation and almost all the organic compounds were degraded.
Rosa
Edson V C
EV
Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil.
Mater
Luciana
L
Souza-Sierra
Maria M
MM
Rörig
Leonardo R
LR
Vieira
Luciane M
LM
Radetski
Claudemir M
CM
D018533:Biomass; D019607:Brassicaceae / Q000187:drug effects* / Q000254:growth & development; D003247:Conservation of Natural Resources; D005308:Fertilizers; D007220:Industrial Waste / Q000009:adverse effects*; D008670:Metals / Q000737:chemistry; D018570:Risk Assessment; D012722:Sewage / Q000009:adverse effects* / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000737:chemistry* / Q000633:toxicity*; D012995:Solubility / Q000187:drug effects; D013783:Textile Industry; D018675:Toxicity Tests
D005308:Fertilizers; D007220:Industrial Waste; D008670:Metals; D012722:Sewage; D012989:Soil Pollutants