2007 Fiscal Year Final Research Report Summary

The study on compost of sewerage sludge mixed with organic waste and its utilization as fertilizer for re-vegetation on wasteland

Research Project

Project/Area Number	17380094
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	林学・森林工学
Research Institution	OKAYAMA UNIVERSITY
Principal Investigator	SHIMA Kazuto OKAYAMA UNIVERSITY, GRADUATE SCHOOL OF ENVIROMENTAL SCIENCE, ACCOSIATE PROFESSOR (80274017)
Co-Investigator(Kenkyū-buntansha)	SASAKAWA Hideo 岡山大学, GRADUATE SCHOOL OF NATURAL SCIENCE, PROFESSOR (40115572)
Project Period (FY)	2005 – 2007
Keywords	sewage sludge / incineration ashes / Heavy metals contents / Re-vegetation / Organic materials
Research Abstract	In order to effective utilize the sewage sludge as the fertilizer ; we clarified the characteristics of the incineration ashes of sewage sludge. Concentration of cadmium (Cd) and lead (Pb) contained in the incineration ashes material decreased dramatically with burnt up at temperature more than 700℃, as result of volatilization. zinc (Zn) and cupper (Cu) contained in ashes of sewage sludge did not decreased after burnt up at temperature of 950℃ but were transformed into in-soluble form by incineration treatments. Sequential fraction of heavy metals as affected by application of the incineration ashes material to soil was analyzed. A greenhouse experiment was conducted to compare the effect of application on the growth of grasses species. Application effect of phosphorus contained in the ashes was larger than that contained in the dried sludge cakes.

(5 results)