Abstract: A new polyvinyl(dialkylthiocarbamoylthio)acetate resin expressed by the formula ##STR1## (wherein R.sub.1 and R.sub.2 each represent hydrogen atom or an alkyl group of C.sub.1 -C.sub.5) is provided.Said resin has a superior heavy metals-removing performance and is insoluble in organic solvents and hence very useful as an agent for removing heavy metals.Said resin is prepared by reacting a tetraalkylthiuramdisulfide expressed by a formula ##STR2## (wherein R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each represent hydrogen atom or an alkyl group of C.sub.1 -C.sub.5) with a vinyl acetate polymer on heating in a solvent.Said resin is used as an agent for removing heavy metals, alone or in admixture with an auxiliary agent such as active carbon.

Abstract: As an agent for removing heavy metals such as mercury from waste waters containing the same, a composition and granule based on the composition are provided. Also a method for preparing the granule is provided. The composition consists mainly of a dithiocarbamate bond-containing low molecular weight compound, amorphous silica and active carbon powder. The granule consists mainly of said composition and a vinyl acetate polymer resin as a binder. The method is carried out by kneading and extruding the composition of the granule together with a clay as an excipient. Treated water through said agent can pass the current very severe effluent standards.