Flow rate analysis of wastewater inside reactor tanks on tofu wastewater treatment plant

1st International Symposium on Green Technology for Value Chains 2016

工业技术;生态环境科学

Mamat^1 ; Sintawardani, N.^1 ; Astuti, J.T.^1 ; Nilawati, D.^1 ; Wulan, D.R.^1 ; Muchlis^1 ; Sriwuryandari, L.^1 ; Sembiring, T.^1 ; Jern, N.W.^2

Research Unit for Clean Technology, Indonesian Institute of Sciences (LIPI), Jalan Cisitu 21/154 D, Bandung

40135, Indonesia^1

NEWRI, Nanyang Technological University (NTU), Singapore, Singapore^2

关键词: Anaerobic process;    Atmosphere pressure;    Bacteria growth;    Biogas production;    Cross-section area;    Electrical motors;    Maximum pressure;    Wastewater treatment plants;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/60/1/012023/pdf
DOI  :  10.1088/1755-1315/60/1/012023

来源: IOP

【 摘 要 】

The research aimed to analyse the flow rate of the wastewater inside reactor tanks which were placed a number of bamboo cutting. The resistance of wastewater flow inside reactor tanks might not be occurred and produce biogas fuel optimally. Wastewater from eleven tofu factories was treated by multi-stages anaerobic process to reduce its organic pollutant and produce biogas. Biogas plant has six reactor tanks of which its capacity for waste water and gas dome was 18 m3and 4.5 m3, respectively. Wastewater was pumped from collecting ponds to reactors by either serial or parallel way. Maximum pump capacity, head, and electrical motor power was 5m3/h, 50m, and 0.75HP, consecutively. Maximum pressure of biogas inside the reactor tanks was 55 mbar higher than atmosphere pressure. A number of 1,400 pieces of cutting bamboo at 50-60 mm diameter and 100 mm length were used as bacteria growth media inside each reactor tank, covering around 14,287 m2bamboo area, and cross section area of inner reactor was 4,9 m2. In each reactor, a 6 inches PVC pipe was installed vertically as channel. When channels inside reactor were opened, flow rate of wastewater was 6x10-1L.sec-1. Contrary, when channels were closed on the upper part, wastewater flow inside the first reactor affected and increased gas dome. Initially, wastewater flowed into each reactor by a gravity mode with head difference between the second and third reactor was 15x10-2m. However, head loss at the second reactor was equal to the third reactor by 8,422 x 10-4m. As result, wastewater flow at the second and third reactors were stagnant. To overcome the problem pump in each reactor should be installed in serial mode. In order to reach the output from the first reactor and the others would be equal, and biogas space was not filled by wastewater, therefore biogas production will be optimum.