摘要
针对水体底泥比表面积大及富含粘土、铁铝氧化物、碳酸钙等矿物颗粒的特点,开展了曝气预处理强化底泥吸磷效能的研究。试验结果表明:在对底泥进行曝气的过程中,上覆水中的磷含量保持在较低水平(0.017 mg/L);底泥对磷的累计吸附量和吸附速率均显著高于未经曝气预处理的底泥。吸附312 h后,预处理底泥对溶解性磷酸盐(SRP)和总磷(TP)的吸附速率分别降至2.484和2.53 mg/(kg.h),而未预处理底泥的吸附速率分别降至0.391和0.896 mg/(kg.h)。不同的底泥吸附磷后,其弱吸附态磷(NH4Cl-P)及铁结合态磷(BD-P)的含量显著增加,说明磷被底泥吸附时,可能最先形成生物可利用态磷。
Based on the characteristics of sediments, such as high specific surface area, abundant inclusion of hydroxy clay mineral, Feox, Alox, and calcium carbonate, a study on enhancement of phosphorus adsorption by aeration pretreatment was carried out. The results show that the phosphorus concentration in the overlying water is kept at a low level of 0. 017 mg/L during aeration of the sediment. The accumulative phosphorus adsorption and the adsorption rate by the pretreated sediment are evidently higher than that by the non-pretreated sediment. After 312 h adsorption period, the adsorption rates of SRP and TP by the pretreated sediment are decreased to 2. 484 mg/（kg · h） and 2.53 mg/（kg · h）, while those by the non-pretreated sediment are decreased to 0. 391 mg/（kg · h） and 0. 896 mg/（kg · h） respectively. When phosphorus adsorption is performed using different sediments, an increase in the amounts of NH4Cl - P and BD - P is shown. This may indicate that bioavailable phosphorus is formed at the first step of phosphorus adsorption.
出处
《中国给水排水》
CAS
CSCD
北大核心
2007年第19期23-26,共4页
China Water & Wastewater
基金
江苏省环境科学与工程重点实验室开放课题(ZD061202)
关键词
水体修复
底泥曝气
吸附
磷的赋存形态
生物可利用态磷
remediation of water body
aeration of sediment
adsorption
phosphorus forms
bioavailable phosphorus
