Experimental Study With Water Purification Device About Yangtze River Water

According to the present situation of drinking water in small towns, and water quality change after the completion of three gorges reservoir, advanced water purification device is developed with the functions of easily operating, less area- covering and low cost. The main treatment processes of the devices are as follows: efficient three-dimensional grid reaction with small pores, precipitation in inclined pipes, baitlayer filter material with quartz sand and active carbon.The raw water with high temperature and high turbidity was used in the preliminary research, which was to seek the optimal processing parameters. This thesis mainly studied treatment effect under the condition of low temperature and low turbidity. The water flow and medicine dosages were changed to determine the process parameters of the device under such conditions. After experimental research, main conclusions were as follows: quality of effluent was detected in the device under such conditions: water flow was 50m³/d, the average turbidity water was 60NTU, PAC dosages were 17.5 mg/L, median mg/L, 22.5 mg/L, 25.0 mg/L, 27.5 mg/L, 30.0 mg/L, 325 mg/L, 35.0 mg/L, It tests the removal effect of water purification in the unit effluent turbidity, COD_Mn and NH₄⁺-N. In that condition, Through the experiment the optimal dose of pitch PAC is 25.0 mg/L.When water flow was 50m³ / d, the average water turbidity was 60NTU, PAC dosage was 25.0 mg/L. After the experiments, the turbidity removal was 99.31% 99.73%, COD_Mn removal was 47.38% 56.00%, NH₄⁺-N was 22.66% for 36.61%, which show that the device ran smoothly and met the national standards.When water turbidity and PAC dosage remained unchanged, influent was increased to 65m³ / d, impact load tests were carried out in the device. Results were as shows: although the quality of effluent had declined compared with former situation, which still met national standards, and the turbidity removal was 98.91% 99.32%, COD_Mn removal was 39.86% 52.25%, NH₄⁺-N was 20.50% for 31.19%, Through the impact resistant load test, it showed that the device had the strong resistance to compact the hydraulic loading capacity, and would be available in small towns and rural areas, where water consumption was fluctuating.The mud was discharged on daily basis from precipitation canister. When designing flow was 50m³ / d and average water turbidity was 60NTU, discharged mud frequency was adjusted everyday according to the changes of raw water turbidity and influent, 60s a time. Filtration process cycle was 24 h, high-speed backwash was eight minutes, backwash strength was 15 L/s·m²In this paper, the economy and technical feasibility of the device was analyzed, it shows that total costs is 1.76 yuan/m³, including 45% for management fees(0.79 yuan/m³), 55% for other fees (0.97 yuan/m³), which describes this device has certain economic advantage, and is accessibly facilitated and utilized in small towns and rural area.