The Distribution Of Urban Sewage Treatment Plant Energy Consumption And Study On Working Conditions Control

Due to the restriction of the chemical properties of sodium ion, it is very difficult to remove sodium salt from high sodium-containing wastewater at a low cost, so biological treatment of high sodium-containing wastewater often face the strong effects of high sodium salt. In order to improve the efficiency and stability of biological treatment of high sodium-containing wastewater, it is very important to study how to alleviate or remove the effects of sodium salt. According to effects and mechanisms of high sodium salt, the author firstly explores the characteristics and rules of activated sludge high sodium-containing wastewater treatment under the compatible solutes betaine, then chooses the typical high sodium heparin production wastewater as a verification target. Studying the effects and rules of the betaine aerobic and anaerobic processes of real heparin production wastewater by testing, which may provide a reference for alleviating the effects of processes of biological treatment of high sodium-containing wastewater.The main results of this research are:1、The effects and rules of betaine were explored by artifical wastewater and the results showed that the initial influent sodium concentration were 2g/L,4g/L,6g/L,8g/L and 10g/L respectively in SBR system, betaine showed continuous and different degree improving effect on ammonia nitrogen removal rate. When the the initial influent sodium concentration was 8g/L in system, 1mM betaine improved ammonia nitrogen removal rate by 25% and continually lasted 34 cycles(17d), it showed that betaine has a good improving capacity of na-salt stress. For the removal rate of TOC, the role of betaine is not obvious, only when the initial influent sodium concentration was 10g/L, betaine showed a certain improving effect, the average removal rate of TOC increased by about 5%.2、For anaerobic biological treatment process of heparin wastewater, the author studied the effect of adding 0.5-3mM betaine in the case of severe fluctuation of salinity(the influent sodium concentration rapidly increased from 25000mg/L to 15000mg/L).The results showed that 1mM betaine had the best improving effect on sludge characteristics of system, the removal rate of TOC was increased by 15.3%, the ammonia nitrogen removal rate increased by 18.7%, and continually lasted about 6d. It showed that betaine can effectively alleviate the effect of salt stress during aerobic treatment process of real wastewater.3、For anaerobic biological treatment process of heparin wastewater, the author studied the impact of 0.43-3mM betaine was added while the influent sodium concentration is 13000mg/L and the influent organic loading is 1.33～2.0kgCOD/(m3.d), Three trials showed the similar law:within a certain range betaine could improve the organics removal and ammonification. when the amount of betaine is 1.0～1.5mM, there are positive effects on the improvement of the system; the COD removal efficiency is improved up to 37.6%; ammoniated rate also greatly improved, the effect of improving the maximum 31%.this study also proves the validity of betaine from the perspective of anaerobic biological treatment.4、Overall, through the use of artificial high sodium-containing wastewater and heparin wastewater, studying the effects of betaine on sodium salt indicates that betaine showed a good effect on the biological activity of the system, which provide a feasible solution for lalleviating the effects of high salinity on activated sludge.