Cement kiln collaborative disposal of municipal solid waste incineration (MSWI) fly ash (referred to as fly ash) can achieve harmless recycling of fly ash. However, because of high chlorine (Cl) content in fly ash, the practical application of this technology is seriously restricted. In order to find a suitable leaching solvent for dechlorination of fly ash, this study compared the effect of lactic acid fermentation liquid (FL) and sludge FL of food waste on dechlorination. Results show that 90% of water-insoluble Cl in fly ash can be removed by a three-step leaching process with lactic acid FL and sludge FL, and the Cl content in leached fly ash residue is 0.44% and 0.39%, respectively. According to calculation, permissible fraction of the residue after three-step leaching with addition of lactic acid FL and sludge FL in kiln is 4.28% and 4.99% higher than that of the residue after three-step leaching with pure water, respectively. Furthermore, the properties of leaching solvents after leaching experiments indicate that organic acids with low pH value and high concentration are more conducive for removal of water-insoluble Cl. Therefore, it is feasible to use two kinds of FL as leaching solvent for fly ash dechlorination.

本研究は，中型まき網漁，はえ縄漁，釣り漁の3つの漁船漁業における活動量当たりの漁船漁業用プラスチック製品の投入量原単位の推定を行った．各漁船漁業の漁業従事者から漁業用製品の購入データを入手して整理するとともに，その他必要な情報を漁業従事者へのヒアリング調査等によって入手し，ボトムアップ型の調査を行った．その結果，中型まき網漁のプラスチック製品投入量原単位は，漁獲高1t当たり6kg，はえ縄漁は186kg，釣り漁は36kgと推定された．プラスチック製品のうち，漁網，釣り糸，疑似餌等，海中で使用されるプラスチック製品では，中型まき網漁が漁獲高1t当たり2kg，はえ縄漁は94kg，釣り漁は7kgのプラスチック製品を投入していると推定された．