稳定塘藻类生长规律及其影响的中试研究

在兰州构建了自然型稳定塘（自然塘）和人工型稳定塘（人工塘）的中试系统，研究了两种稳定塘中藻类生长状况及藻类生长对稳定塘污染物去除功能的影响。相比于自然塘，人工塘增加了折流式导流墙且悬挂了无纺布载体。结果表明，增设导流墙使得人工塘中水流速度比自然塘增加了2．4倍，这抑制了人工塘中藻类的生长繁殖。自然塘中藻类比人工塘中藻类生长更为旺盛，叶绿素a峰值分别出现在3月和4月，为279．44mg·m^-3和115．65mg·m^-3。藻类光合作用使得稳定塘出水DO和pH都明显高于进水，自然塘藻类生长更为旺盛，因此出水与人工塘出水相比具有更高的DO和pH。更高的pH使得自然塘具有更好的氨氮和总磷去除率，分别为56％和19％。

Pilot Scale Study on the Growth of the Algae in Stabilization Ponds

The growth of algae was studied in a pilot scale natural stabilization pond （NSP） and artificial stabilization pond （ASP）. The ASP was equipped with guide walls and non-woven cloth carrier. The flow rate in the ASP was 2.4 times higher than that in the NSP because of the guide walls. It was found that the higher flow rate inhibited the algae growth in the ASP. The chlorophyll-a level in the NSP was consistently higher than that in the ASP during the study period. The peak value of chlorophyll a in NSP appeared in March and reached 279.44 mg ·m^-1, while in ASP the peak value appeared in April and reached 115.65 mg ·m^-3. The pH and the DO were increased in the NSP and ASP due to the metabolism of algae when compared with the influent. Due to the better growth of algae, the NSP generally had higher levels of pH and DO than did the ASP. Also, the NSP had a higher level of ammonia and total phosphorus removal efficiency due to the higher pH, which were 56% and 19% respectively.