Use of bamboos and corrugated asbestos cement as local materials for tube settlers | |
| Author | Winai Liengcharernsit |
| Call Number | AIT Thesis no. 832 |
| Subject(s) | Water treatment plants Water-pipes Pipe, Concrete Bamboo |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The research was conducted at pilot plant scale to study t he application of bamboo and corrugated asbestos cement as tube settlers. The parameters which affected the settling performance were studied. These included tube length, diameter, inclination angle, and rat e of flow. The pilot plant consisted of a flocculation tank with mechanical mixing, chemical feeding system, and a reinforced concrete sedimentation tank. The bamboo tubes were prepared and arranged in the concrete tank. The experiments were performed with various flow conditions. Turbidity was measured to find the efficiency of removal. The test results were compared with t hat obtained when corrugated asbestos cement was used. It was found that the bamboo tube settlers was efficient for turbidity removal when the flow rate was not more than 8 m3 /hr. per sq. m. of tank surface area. ·The removal efficiency of the tube settler with t he length of 120 cm., operated at the flow rat e below 8 ni3/hr. per sq. m. of tank surface area was found to be higher than 80 per cent. The tube diameter and inclination angle seemed to have less significant, however, it was found that the smallest tube gave little better results. The inclination angle was varied from 50 to 70 degrees at the interval of 10 degrees and it was found that at 60 degree inclination angle the results obtained were best, The problems which might limit t he application of bamboo as tube settlers included: The cracks along bamboo tubes; the difficulty in smoothing the inside of the tube, and odour and slime caused by digestion of organic matter from the bamboo. All these problems affected the removal of settled deposit from the tubes, and thus reduced the turbidity removal efficiency. It was found that the removal efficiency of the settling tank with corrugated asbestos cement as tube settlers was higher than that obtained from the bamboo tube settlers. At the flow rate of 8 m3 /hr. per sq. m. of tank surface area the removal efficiency of the corrugated asbestos cement tube settlers with 120 cm. in length was found to be about 90 per cent. The inclination angle had a little effect on settling performance, however the difference in turbidity removal when t he angle was varied from 50 to 70 degrees was not over 3 per cent. At the inclination angle of 50 degrees the best results were obtained. The disadvantage of the corrugated asbestos cement was its higher cost which made the construction cost increase. |
| Year | 1975 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Nguyen Cong Thanh ;Pescod, M.B. |
| Examination Committee(s) | Yang, Yi Ping ;Samorn Muttamara |
| Scholarship Donor(s) | ESCAP |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1975 |