Study on the Utilization of Activated Sludge of Sewerage in Industry

Fertilizer Response on Zoysia Matrella Merr.

Abstract

Factories in all kind of industry treat organic sewerage with conventional activated sludge process. Quality of the digesting sludge consists of the microorganism: Zoogloea, Rotifer, Protozoa.
Therefore, subject of the biological sludge is protein, and also is able to be utilized as organic fertilizers.
We examined fertilizer response of the sludge by Neubauer's seeding test and mineralization in soil (sand or clay), and experimented effect when cohesion is added in digesting process.
Further, we investigated fertilizer response in case of lawn by pot tests, and experimented effect on soil amendment, as compared with the same kind material on the market.
1) Fertilizer response of the activated sludge is slowly-release as similar to Rape seed oil cake and Herring meal, and also it is not so injurious than oil cake.
2) Addition of all sort of cohesion to sewerage reduce sprouting percentage, and lime exerts worst effect of all inorganic cohesion in phosphorus nutrition of plant.
3) In case of pot test by turf, their growth causing by sludge dressing, is more effective on under ground part than on above.
4) Dressing of the sludge reduce hardening of soil when it is treaded on the lawn.