Study on the design parameters of natural recycle treatment system

• Main Authors: Hsiu-Te Lin, 林修德
• Other Authors: none
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/09500598724989057967

碩士 === 中原大學 === 土木工程研究所 === 97 === The study used the facilities of “Natural Recycle Treatment System” to do reclaimed water from sewage. The experiment place locates in the Agricultural Engineering Research Center (AERC). The water quality, water quantity, and operating cost were analyzed from the facilities. The tank for “Natural Recycle Treatment System” occupies the land area of 8 m2, and has the volume of 4.70 m3, and the capacity treatment quantity of 10 m3 per day, and the design hydraulic retention time (HRT) of 10.2 hr. This system had been operated for 3 years to treat 119 data, and the water quality after treatment was good. The SS average can be reduced below 10 mg/L, the BOD below 5 mg/L, the NH4 +-N below 1 mg/L. The system can solve the environment problem of sewage pollution. The functions for each subtank of this treatment system were studied further. In decay test showed that the main function in the first subtank is to remove the SS, NOx from the sewage; the main function in the second subtank is to remove the organic matter from the sewage; the main function of the third subtank is to adsorb apparent color and odour. The primary biotechnology reaction in this system is in the second subtank. The results showed that the removed design parameter groups for the NH4 +-N and BOD are (0.6079, 0.9027) and (0.5122, 1.1697) respectively. The system needed to be backwashed after completed processing for four months in succession. In this research, the final sludge concentration was used to infer the effect of the backwash. Water-backwash had the highest final sludge concentration among the 4 studied types, and this was the worst type. The lowest of the final sludge concentration was in the synthetic batch backwash type which used the least water among the 4 types. The study suggested that the synthetic batch backwash type of 5 minutes air-backwash, 5 minutes air-water-backwash, and 5 minutes water-backwash in turn could be used as the backwash for the system.