黑臭底泥土著微生物促生对磷的影响

土著微生物促生是一项低成本高效率的河湖黑臭底泥原位修复技术,然而向底泥中投加药剂可能会影响上覆水水质。为探讨该技术对水环境的不利影响,实验研究了城市湖泊黑臭底泥修复过程中上覆水中磷浓度和底泥中磷含量及形态的变化。结果表明,在投药深度为泥面以下15 cm,微生物营养剂（BE）和生物解毒剂（MT）的投加量分别低于60mL/m3和70 mL/m3的条件下,上覆水总磷（TP）浓度低于地表水环境质量Ⅲ类（湖库类）标准值。投加微生物促生剂（BE和MT）导致上覆水磷含量升高,并促进了上覆水中藻类的增长。复配投加硝酸钙能减少上覆水中磷含量及藻类生物量,从而抑制微生物促生剂对上覆水磷浓度的影响。另外,投加微生物促生剂及硝酸钙到底泥中后,底泥磷含量以及磷形态组成的变化均不明显。

Effect of indigenous microbial promoting on phosphorus in black-odor sediment and overlying water

The indigenous microbial promotion is an in situ black-odor sediment remediation technology with low cost and high efficiency which is applied to river or lake.However,the adding of agent to the sediment may affects the quality of overlying water.In order to analyze the adverse effects of this technology,we determined the changes of phosphorus（P） contents and its fractions in the overlying water and black-odor sediment from an urban lake.Results showed that when the adding dose of Bio Energizer（BE） and Micatrol（MT） to sediment was 60 mL / m3and 70 mL / m3,respectively,the total phosphorus content（TP） in the overlying water was lower than 0.05 mg / L（Grade Ⅲ value of National Environment Quality Standard for Surface Water in China）.However,the adding of microbial nutrient（BE and MT） to sediment still led to the increase of TP as well as the proliferation of algae in the overlying water.Adding of Ca（NO 3） 2 significantly reduced the TP and algae biomass in the overlying water,which controlled the effects of adding microbial nutrient to sediment on the TP in overlying water.In addition,the adding of both Ca（NO 3） 2 and microbial nutrient had no obvious effect on the TP and P fractions in the sediment.