[Effect of organic matter on phosphorus removal for substrate in constructed wetland].
Effect of organic matter (OM) on the phosphorus(P) removal efficiency for shale-haydite in constructed wetland was investigated. At the conditions of hydraulic retention time 2 d, water flew in and out continuously, P concentration in water, its fractions in the substrate, and biomass in biofilm were analyzed. The results showed that the P removal efficiency for the substrates decreased with the increasing concentration of the OM, and that P sorption capacity for the substrate was inhibited by the OM. When COD in the influent were 100 mg/L and 200 mg/L, P sorption capacity was decreased to 49% and 62%, labile organic phosphorus, Humic-P and Ca/Mg-bound P were significantly increased, Fe/Al-bound P was decreased from 36.75% to 18% and 11.77%. Thus, the result indicated that due to the OM accumulation, the portion of Fe/Al-bound P was low, and P sorption capacity was inhibited. In addition, the higher the concentration of OM is, the more biomass in biofilm is. The thickness of biofilm negatively correlated with mass transfer of phosphorus through the biofilm.
Li
Jian-Bo
JB
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. ljblion@163.com
Wen
Yue
Y
Zhao
Xing-Jie
XJ
Zhou
Qi
Q
Jiang
Zhi-Guang
ZG
Zhang
Qian
Q
D009930:Organic Chemicals / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid / Q000379:methods*; D053833:Wetlands
D009930:Organic Chemicals; D010758:Phosphorus