The Study on Water Quality Improvement for Dry Weather Seweage at Drainage Pumping Stations

• Main Authors: Tzann Chang, Su, 蘇讚昌
• Other Authors: D. H. Tseng
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/77236021094105488525

碩士 === 國立中央大學 === 環境工程研究所 === 82 === This study works for initial understanding of Drainage Pumping Stations in Taipei、 water quality of dry weather seweage in those stations and trying to offer water quality improvement for the most polluted stations 。We choose Chun- kong 、 Ui-chang、 Jing-chao and Shi-wen four pumping stations as objects to analyze in this research 。As a result of the study for water quality of dry weather seweage， including BOD5、COD、NH3-N、TSS， we find Chun-kong and Ui- chang pumping stations are polluted se- riously。There are thirty-five pumping stations'NH3-N contains． unqualified for discharge permit standard in 1988。According to analytical result of those chosed pumping stations ，we find the percentage in seweage of suspended solids approximated that of of dissolved solids and this depended on different regions we get sample。For example，Shi-wen pumping station has more total organic solids than others，owing to marker seweage it absorbed；Jing-chao pumping station has more total inorganic solids than others。Because of these different characters of seweage， the suggestions we offer to stations will not the same 。In BOD curve for twenty days ， we find BOD constant K10 is between 0.073 and 0.198 approximated to the characters of general domestic wastewater ， this means that we can make use of traditional way to deal those seweage。When we make seweage se- dimentated for two hours，we find removal rate of organic solids is 42.6-55%、removal rate of inorganic solids is 45-57.4%、re- moval rate of BOD5 is 47-62%、removal rate of COD is 35-56% 。 But there is no use for removal of NH3-N。 When we put 30 mg/l PAC in seweage for doing chemical precipitation，removal rate of suspended 　solids is above 90% ，removal rate of COD is 62-76%，there is still no use for removal of NH3-N．