氢氧化钙除河道水中磷的试验研究

用氢氧化钙去除河道水的总磷。结果表明：在先1分钟300r／min快速搅拌，后5分钟40r／min搅拌的条件下，直接投加1250mg·L^-1。氢氧化钙时，出水总磷为0．046mg·L^-1，可达到《景观娱乐用水标准》（GB12941—91）中C类标准（11P≤0．05mg·L^-1）和《地表水环境质量标准》（GB3838—2002）中II类标准（TP≤0．1mg·L^-1）；在同样的反应条件下，预先调节水样pH至10，投加量达到3250mg·L^-1时，出水总磷达0．068mg·L^-1。该药剂对COD和浊度均有良好的去除效果，但对氨氮的去除效果不明显。

Experimental Study on River Phosphorus Removal with Calcium Hydroxide

The chemical process is used to remove the TP of river with calcium hydroxide. The result shows that in the condition of agitating intensity 300 r/min 1 min firstly, then 40 r/min 5 min, adding calcium hydroxide 1 250 mg· L^ - 1 directly into the water sample, the content of rip will lower to 0. 046 mg · L^-1 It can reaeh to the C Standard （ TP ≤0. 05 mg · L^ - 1 ） of Water quality standard for scenery and recreation area （ GB12941 - 91 ） and the Ⅱ Standard （ TP ≤0. 1 mg · L^-1 ） of Environmental quality standards for surface water（ GB3838 -2002）. At the same reaction condition, adjusting the pH of the water sample to 10, then adding calcium hydroxide 3 250 mg · L^-1 into the water sample, the content of TP will lower to 0. 068 mg · L^-1. At the same time. It also has good elimination effect on the COD and turbidity. But it is not obvious to NH3 -N.