IN SITU TREATMENT FOR CONTAMINATED SURFACE WATERS AND PRODUCTS THEREFOR

摘要

This invention is directed to a method for the prevention of growth of aquat ic algae which method comprises adding a quantity of timed-release tablets of a dry particulate composition into the surface water, wherein said tablets comprises: (a) an inner-core comprising at least one live microorganism stra in in dormant condition; (b) an inner-coating over the inner-core of a water soluble substance selected from the group consisting of polyethylene glycol and hydroxypropyl methylcellulose; (c) an outer-layer over the inner-coating comprising sodium sulfate coated sodium carbonate peroxyhydrate particles an d a colorant that reflects light at the same wavelength used in photosynthesis by the algae, thereby prevents the necessary light from penetrating the surface water, and (d) an outer-coating over the outer-layer of a water soluble substance selected from polyethylene glycol and hydroxypropyl methylcellulose.