[Efficiency and mechanics of surfactant modified zeolite with nitrate adsorbed to control nitrogen and phosphorus release from sediments].
Efficiency and mechanics of surfactant modified zeolite (SMZ) with nitrate adsorbed to control nitrogen and phosphorus release from sediments were researched. The results show that: 1) The optimal level of HDTMA adsorbed on SMZ for nitrate sorption was 276% ECEC. The sorption of nitrate on SMZ can be well described by the Langmuir sorption isotherm, and the sorption capacity was 1724 mg/kg. The nitrate sorption on SMZ was quick and the nitrate adsorbed on SMZ can be released. The sorption of ammonia and phosphorus on SMZ with nitrate adsorbed can also be well described by the Langmuir sorption isotherm, and the sorption capacity of ammonia and phosphorus are 12.0 mg/g and 0.597 mg/g respectively. 2) The barrier of SMZ with nitrate adsorbed can provide nitrate for surface sediments for a long time, and the quantity of released nitrate in overlying water was much less than that of nitrate directly added. This barrier can not only efficiently control ammonia release from sediments, but also control phosphorus release from sediment efficiently.
Lin
Jian-wei
JW
School of Marine Science & Technology, Shanghai Fisheries University, Shanghai 200090, China. linjianweihh@126.com
Zhu
Zhi-liang
ZL
Zhao
Jian-fu
JF
Zhang
Hong-hua
HH
Zhan
Yan-hui
YH
D000327:Adsorption; D019015:Geologic Sediments / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry; D014876:Water Pollution / Q000517:prevention & control; D017641:Zeolites / Q000737:chemistry*
D009566:Nitrates; D014874:Water Pollutants, Chemical; D017641:Zeolites; D010758:Phosphorus; D009584:Nitrogen