城市自来水厂深度处理工艺中臭氧设计参数的取值及成本分析

DESIGN VALUES RESEARCH AND COST ANALYSIS OF OZONE USES IN CITY WATER PLANT DEEP TREATMENT PROCESS

在饮用水水源污染仍呈加剧状态,而国家生活饮用水卫生标准在逐步提高的背景下,传统制水工艺难以满足对"两虫"、难降解类农药指标、微囊藻毒素LR等的达标处理,以臭氧-活性炭为主的深度处理将是未来我国自来水厂的发展趋势。结合工程案例,系统介绍了臭氧发生系统的设计参数取值、基本运行成本分析,提出:(1)臭氧设计规模≥60 kg/h采用空气源作为气源才显现经济型,规模<60 kg/h优先选用液氧作为气源;(2)臭氧发生系统"耗电功率+液氧耗量"综合费用的最优设计浓度为质量分数CO3=10%;(3)臭氧发生器产量反比于冷却水温T,臭氧发生器冷却系统中水泵流量、功率配置应按夏季最不利温度条件下计算;(4)采用臭氧系统相较常规工艺增加的运行成本在0.056～0.11元/m3左右。

The drinking water sources pollution will be continued in a not short term, but the national life sanitary standard for drinking water would be improved strictly, the traditional water making process hard to handle ＂two worms＂, hard-degradation kind of pesticide index, LR.etc. The ozone-biological activated carbon （O3/BAC） process will be greatly used in China water plant. Combined with engineering example, introduces the design parameters of ozone generating system values, the basic operation cost analysis, put forward： （1） If the ozone design scale I〉 60 kg/h, 03 produces by air will economy than by liquid oxygen, but if the scale〈60 kg/h, choose liquid oxygen as the raw materials would be better; （2） If Co~== 10%, ＂power consumption＋liquid oxygen consumption ＂ is lower than other Co,= value, 10% is optimal design parameters; （3） Ozone generator production Inverse ratio in cooling water temperature, pumps flow and motor s shall be according to the summer temperature conditions; （4） Compared with conventional process in water plant, the ozone system cost increased 0.056-0.11 yuan/m^3 .