Department of Environmental Engineering, Korea Maritime and Ocean University, Busan, South Korea.
Department of Convergence Study on the Ocean Science and Technology, Korea Maritime and Ocean University, Busan, South Korea.
Environ Sci Pollut Res Int. 2018 Oct;25(30):30101-30109. doi: 10.1007/s11356-018-2970-6. Epub 2018 Aug 25.
This study aimed to maximise the amount of CO storage by indirect carbonation using paper sludge ash (PSA), which is an alkaline industrial waste. The properties of the following three types of solvents were considered: acids (acetic acid and hydrochloric acid), ammonium salts (ammonium chloride and ammonium acetate) and others (sodium citrate and water). When carbon dioxide was injected into calcium leachates prepared from PSA using acids, carbonation did not occur, and using ammonium salts as solvent, the carbonation efficiency was low. However, after pH swing of the leachates using sodium hydroxide and ammonia solution for acid and ammonium salt solvents, up to 324 kg CO/(ton PSA) and 175 kg CO/(ton PSA) were stored, respectively. When carbon dioxide was injected into calcium leachates prepared from PSA using sodium citrate or water, solid was initially generated which later dissolved. In order to solve this problem, CO injection was stopped just before the pH of the solution reached 10.5 for sodium citrate and 8.3 for water, resulting in the storage of 136 kg CO/(ton PSA) and 29 kg CO/(ton PSA), respectively. Solids obtained through carbonation were pure calcium carbonate.
本研究旨在通过使用造纸污泥灰（PSA）进行间接碳酸化作用来最大限度地储存 CO，PSA 是一种碱性工业废物。考虑了以下三种类型溶剂的性质：酸（乙酸和盐酸）、铵盐（氯化铵和乙酸铵）和其他（柠檬酸钠和水）。当使用酸将 CO2 注入从 PSA 中制备的钙浸出液中时，碳酸化作用并未发生，而使用铵盐作为溶剂时，碳酸化效率很低。然而，在用氢氧化钠和氨溶液对酸和铵盐溶剂的浸出液进行 pH 值调节后，分别可以储存高达 324 kg CO/（吨 PSA）和 175 kg CO/（吨 PSA）。当使用柠檬酸钠或水将 CO2 注入从 PSA 中制备的钙浸出液中时，最初会生成固体，然后再溶解。为了解决这个问题，当溶液的 pH 值达到 10.5（柠檬酸钠）和 8.3（水）时，停止 CO 注入，从而分别储存了 136 kg CO/（吨 PSA）和 29 kg CO/（吨 PSA）。碳酸化作用得到的固体是纯碳酸钙。
