| The thesis places emphasis on researching the urban landscape river water quality and nutritional status changes for example of Jin River. Apart from the general characteristics of the river landscape, Jin River, as the landscape river, has its own characteristics: water of low-speed flow, relatively poor water power, basically depending on the upstream and downstream irrigation pumps and pumping to promote. There are more rivers in Tianjin than other cities. Jin River flows along with crosspoint to south canal and Jin river. As the landscape river, the river-water quality has been declining in addition to severe eutrophication in the turn of spring and summer, due to deteriorating water quality of the Haihe River, and runoff, urban sewage, Endogenous pollution factors in recent years.By virtue of monitoring several key water quality parameters, it can be indicated that contents of CODcr, BOD5, TP, TN in Jin river do not meet landscape water demand and surface water quality standards. Especially in months of higher temperature and flood season, water body is under severe eutrophication. In order to curb eutrophication, it is necessary to identify its constraints. Under current judgment on eutrophication indicators normally used, the mostly direct method is to control the nitrogen and phosphorus discharged. Phosphorus removal is particularly crucial to prevent Eutrophication, for P is a major limiting factor in Eutrophication. As a result, the content of total phosphorus needs controlling in order to keep quality in river water. In view of the river eutrophication status, in addition to comparing various methods, pharmaceutical dosage to improve water quality in Jin River is applicable, in addition to the small scale test, test, production test of river-water chemical phosphorus removal and purification is necessary. Meanwhile, according to effect in river under the condition of purifying agent of different volume, optimal volume is confirmable.The topics provide technical support for landscape water management in Tianjin and other cities throughout country, through study on two river water eutrophication control and self-purification technology, in addition to adding pharmaceutical dosage to improve the two river water quality. |
