Diatomite Strengthening Sbr Technology Of Urban Sewage Treatment Experimental Research

This test takes SBR process as the research object, use urban sewage water for test, to the 《urban wastewater treatment plant emissions standards》(GB18918-2002) level1A standard evaluation standard for out of the water, A visit to the dosing diatom fine soil after the SBR technology to COD, NH3-N, TN, TP, SS removal characteristics, and study if the can meet increasingly stringent sewage discharge standard.This trial water and inoculation are from the same sewage treatment plant, so the sludge in the short time domestication, inoculation domestication takes about seven days, the sludge from the first black brown color gradually become yellow, with a slight Clay smell. Every cycle of water out of the water and COD for testing, when COD removal rate of75%or higher stability for marks the reactor successful start, total lasted about10days.When the reactor stability after the operation, began to not dosing diatoms of pure soil SBR reactors blank test, based on the test data, it is known that the traditional SBR technology of contamination removal in effect is not ideal, to COD, NH3-N, TN, TP and SS the removal rate of were76.56%,71.35%, 63.05%,61.54%and88.96%, and the effluent water quality indexes can only reached 《the urban sewage treatment plant emissions standards》(GB18918-2002) level1B standard.When the blank test is completed, the fine start diatoms of intensifying test soil. First after the preliminary calculation to the reactor after one-time dosing diatom fine soil13g, guarantee system of pure soil balance for concentration diatoms of1000mg/L, again with the daily row mud volume added dosing diatom fine soil50mg/L. Then the author examines the SBR process of oxygen in the mixing stages, good oxygen aeration stage and quiet place precipitation phase dosing quantitative diatom fine soil, to remove pollutants on the effect of soil after research to determine the optimal diatom dosing position for good oxygen aeration stage, this time the system of the COD, NH3-N, TN, TP and SS the removal rate of were87.02%,88.18%,80.20%,83.48%and95.10%. The last survey of the pure soil diatom dosing quantity of SBR process to remove pollutants the effects of the pure soil diatom found that with the increase of dosing quantity, SBR reactor on the COD, NH3-N, TN, TP and SS the removal rate of increase linearly corresponding, and finally determined that diatom fine soil best dosing quantity of50mg/L.In the process of SBR enhanced biological factors analysis, the first survey of the change sludge age (6days,8day,12days) to dosing diatom fine soil after the influence of SBR reactor, found that the sludge age to strengthen the effect of SBR reactor is obvious. Along with the increase of the sludge age, the system of COD, NH3-N, TN and SS removal is rising and the system for the removal rate of TP to drop. Finally confirmed the system the optimal sludge age for eight days, this time in phosphorus has good effect.Then examine the different dissolved oxygen (2.0mg/L,3.5mg/L,5.0mg/L) to pure soil strengthening diatom SBR reactor, the influence of the change of the dissolved oxygen found COD, NH3-N, TN and TP remove the effects of the more significant, dissolved oxygen needs to keep in certain limits to ensure denitrification and phosphorus effective, determine the good oxygen aeration stage should be the best dissolved oxygen for3.5mg/L control.Finally the research in different aeration time (7.Oh,7.5h,8.Oh) and different precipitation time (1.0h,1.5h,2.Oh) the system of contamination removal in effect. Sure the system on COD and NH3-N operation condition for the best good oxygen aeration7.5h, quiet place precipitation1.5h; The optimal system to TN operation condition for good oxygen aeration7.Oh, quiet place precipitation2.5h; The optimal system to TP operation condition for good oxygen aeration7.5h, quiet place precipitation1.0h. After considering the system is determined the best aeration time of7.5h, best precipitation time of1.0h, right now out the water pollutants indexes meet 《the urban sewage treatment plant emissions standards》(GB18918-2002) level1A standard.