A method of removing particulate silicon from an effluent water in accordance with various embodiments may include: adding a base to the effluent water, an amount of the added base being sub-stoichiometric with regard to a basic oxidation reaction of an entire amount of silicon contained in the effluent water to ortho-silicic acid or ortho-silicate ions; maintaining a resulting mixture of the effluent water and the base in a predetermined temperature range for a period of time, so that a sediment including silicon is formed; and separating the sediment and the effluent water from each other.