Study on Remediation of Lead Pollution in Water by Different Phosphates Combined with Aspergillus Niger
In this study,the effects of refractory iron phosphate and calcium phosphate combined with A.niger on remediation of lead pollution in water were investigated.The results showed that adding iron phosphate,calcium phosphate and A.niger could reduce the content of lead ions in the solution.After 6 days of incubation,the removal rates of lead ions were 97.20%,98.37%and 97.45%,respectively.Among the lead ions removed by calcium phosphate,the content of available lead(TCLP-Pb)that could be extracted was the lowest,0.06 mg/g,and was not affected by A.niger.XRD results showed that the formation of Pyromorphite(Pyro)was found in the treatment of calcium phosphate and A.niger.Compared with calcium phosphate,the content of TCLP-Pb in iron phosphate treatment was significantly lower than that in iron phosphate + A.niger treatment(0.23 mg/g vs.7.38 mg/g).Compared with adding iron phosphate alone,A.niger can secrete oxalic acid and react with lead to form lead oxalate minerals,which reduces the availability of lead.This result is also verified by XRD results.The results of this study indicate that calcium phosphate is a good material for lead remediation,while iron phosphate requires A.niger to assist in the remediation of lead contamination.
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