subjecting rice to saccharification, whereby a saccharified liquid is obtained,
purifying the saccharified liquid with at least one nitrogen-removing treatment to control the amount of soluble nitrogen in the liquid, whereby a purified saccharified liquid is obtained,
subjecting the purified saccharified liquid to alcoholic fermentation, whereby an alcoholic fermentation product is obtained,
subjecting the alcoholic fermentation product to acetic acid fermentation using an acetic acid-producing microorganism, whereby an acetic acid fermentation product is obtained,
adding a gluconic acid fermentation liquid to the acetic acid fermentation product,
mixing the gluconic acid fermentation liquid with the acetic acid fermentation product to obtain a liquid mixture,
filtering the liquid mixture by passing the mixture through an ultrafiltration membrane having a pore size of less than 0.2 μm, whereby the acetic acid-producing microorganism is removed, and
recovering rice vinegar from the filtered liquid mixture.
subjecting rice to saccharification, whereby a saccharified liquid is obtained,purifying the saccharified liquid with at least one nitrogen-removing treatment to control the amount of soluble nitrogen in the liquid, whereby a purified saccharified liquid is obtained,subjecting the purified saccharified liquid to alcoholic fermentation, whereby an alcoholic fermentation product is obtained,subjecting the alcoholic fermentation product to acetic acid fermentation using an acetic acid-producing microorganism, whereby an acetic acid fermentation product is obtained,adding a gluconic acid fermentation liquid to the acetic acid fermentation product,mixing the gluconic acid fermentation liquid with the acetic acid fermentation product to obtain a liquid mixture,filtering the liquid mixture by passing the mixture through an ultrafiltration membrane having a pore size of less than 0.2 μm, whereby the acetic acid-producing microorganism is removed, andrecovering rice vinegar from the filtered liquid mixture.
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