摘要(英) |
In recent years, the governments focus on river pollution remediation, especially targets on rivers which did not reached the objective of removal rate on ammonia nitrogen. Therefore, we mostly adopt local purification system to the river before installing sewerage system to the users, expecting to decrease the situation of river polluting, and also improving water quality. However, Governments Agency could obtain financial subsidy for the facility constructing, the maintenance of the facility would have to be covered by Governments Agency themselves. Governments certainly need to budget to keep the maintenance after the completion of facility. As a result, the benefit assessment and analysis on completed facilities could be referred to the future planning on facilities operation.
Therefore, we took Xinshi Water Purification Facility as a research object, which could handle maximum 30,000 tone of sewage disposal per day and is also the biggest purification in our nation. Xinshi Water Purification Facility is mainly disposal of sewage from Laojei Creek in Taoyuan City, Songwu Village in Pingzhen District and Xinshi area. The Xinshi Water Purification Facility was completed in ROC 102. It has been operating for eight years by far. The Taoyuan City Government has distributed to outsource from the beginning, keeping the maintenance of the facility, including construction costs, electricity fees etc.
To explore the benefits of using “Gravel Contact Oxidation Purification” in creek water improvement, water quality data are collected each year to be analyzed, and the cost of facility constructing and operating are analyzed for the economic benefit, do research on several operating water purification facilities located in Taoyuan City to able to get the conclusions and make suggestions for follow-up facilities designing, maintenance, budgeting etc., in Taoyuan City.
According to Xinshi Gravel Water Purification Facility collected statistics from ROC 103 to ROC 109, it shows significant improvement on water quality. In these years, the BOD(Biochemical Oxygen Demand) removal rates is 80.6% on average, highest rate of 88.3% in ROC 109, the SS(Suspended Solids) removal rate is 86.7% on average, highest rate of 98.7% in ROC 107, the average of ammonia nitrogen removal rate is 91.1%, the design objective of removal rates reach above 70% each year. Among of them, the ammonia nitrogen removal is the most efficient, the density of ammonia nitrogen could even get lower than 1 mg/L, and the processing efficiency could reach above 90% with well operation, so they are certainly referable methods to the government for facilities promotion. Furthermore, Comparing to SifangLin Gravel Water Purification Facility and Dakuaisi Bridge Gravel Water Purification Facility, Xinshi Gravel Water Purification Facility operates the most efficient based on water quality inspection in ROC 109, Dakuaisi Bridge’s is the second-best, SifangLin’s is least comparable, but nonetheless all reached the design objective.
The benefit assessment of the researching fields’ setting: Construction Costs: 6,607 NTD/ CMD, the average of Water Quality: 0.96 NTD/ CMD. Since decreasing the operation of blowers in ROC 106, from 4 units to 2 units, the Annual Power Consumption sharply declined to 88 GWh from 125 GWh. Meanwhile, objective removal rate is reachable. |
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