复合释氧剂的制备及其对水体修复的作用

采用腐殖酸钠、过氧化钙和沸石为原材料,在一定条件下制备复合释氧剂用于黑臭水体的生态修复。研究结果表明,复合释氧剂最佳制备条件为m(CaO_2)∶m(沸石)为1∶1、Na-A质量分数为2%和固化温度为100℃,复合释氧剂可显著延长释氧周期,且释氧过程对水体pH和COD的影响极低;底泥修复实验结果显示,复合释氧剂投加量为560 g/m~2时,上覆水溶解氧和氧化还原电位在第30天时分别维持在1.32 mg/L及42 m V,水中TP和COD去除率可分别达到90.11%和63%,表明复合释氧剂可有效改善水质并抑制底泥磷释放,这对城镇黑臭水体的生态修复治理具有一定的实际意义。

PREPARATION OF OXYGEN RELEASING COMPOUND AND ITS EFFECT ON WATER RESTORATION

Sodium humate,calcium peroxide and zeolite were used as raw materials to prepare the oxygen release compounds which can be used in the ecological restoration of black and odorous water in this paper.The results showed that the optimum preparation conditions were as follows:mass ratio of CaO2 to zeolite was 1 ∶ 1,the mass fraction of Na-A was 2％ and the curing temperature was 100 ℃.The oxygen release cycle of oxygen release compounds could be significantly prolonged,and the effect of oxygen releasing process on the pH and COD of water were very low.When the dosage of the oxygen release compounds was 560 g/m2,the DO and ORP were maintained at 1.32 mg/L and 42 mV,the removal rates of TP and COD were up to 90.11％ and 63％,after 30 days,respectively.The results suggested that the oxygen release compounds could effectively improve the water quality and inhibit the release of phosphorus from the sediment.