Treatment of acid-digested waste liquid

Abstract

Abstract PURPOSE:To efficiently treat acid-digested waste liquid within a short time, by treating the acid-digested waste liquid with active carbon under a strongly acid condition, and then reacting the treated acid-digested waste liquid simultaneously with ozone and hydrogen peroxide in the presence of an alkali at 70-100 deg.C. CONSTITUTION:Acid-digested waste liquid 1 adjusted at pH below 2 is charged into an active carbon adsorbing column 2, to selectively remove organic substances, which are difficult to treat with ozone and hydrogen peroxide, among organic substances in the acid-digested waste liquid and to remove other organic substances as much as possible. The treated waste liquid is introduced into an oxidizing vessel 4, adjusted at pH 8-11 by charge of an alkali 5 such as caustic soda, and then heated and held at 70-100 deg.C by a heat source 6. Thereafter, ozone 15 from an ozone generator 7 and hydrogen peroxide 8 are simultaneously charged into the oxidizing vessel 4 and brought into contact with the pH-adjusted active carbon-treated acid-digested waste liquid, so that the waste liquid is drained as purified water 10 outside the system.

Inventors

• 👤 Yosuke Kondo
• 👤 洋右 近藤
• 👤 Shuji Murakami
• 👤 村上　周治
• 👤 Katsuyuki Otsuka
• 👤 大塚　勝幸
• 👤 Yoshinori Ogata
• 👤 緒方　義徳
• 👤 Koyo Murakami
• 👤 村上　弘陽
• 👤 Teruhiko Hirabayashi
• 👤 平林　輝彦

Bibliographic Details