Acceleration of NaHCO3 on the removal of nitrogen and phosphorus in urban sewage by the symbiosis system of Oedogonium brevicingulatum and activated sludge
LU Jieluo1,2,, WANG Xiaoji1,2, ZHU Jiahao1,2, LIU Hui1,2, GE Fei1,2,, 1.College of Environment and Resources, Xiangtan University, Xiangtan 411105, China 2.Key Laboratory of Efficient Purification and Application of Complex Heavy Metal Wastewater in Hunan Province, Xiangtan 411105, China
Abstract:The symbiosis system of algae and bacteria has the advantages of high efficiency, low consumption, and resource utilization in sewage treatment. However, the COD of most urban sewage treatment plants has been generally lower than expected thus reduces the removal rate of nitrogen and phosphorus in the upgrading process of achieving the level A discharged standard of urban sewage (GB 18918-2002). On the basis of constructing a symbiosis system of O. brevicingulatum and activated sludge, an external carbon source was used to promote its removal effect of nitrogen and phosphorus from urban sewage. The results showed that the optimized process conditions for the symbiosis system of O. brevicingulatum and activated sludge were as follow: the dry weight ratio of algae and bacteria was 3∶1, the initial biomass was 0.3 g·L?1, the aeration rate was 0.2 L·min?1, and the aeration and intermission interval was 6 h/6 h. After comparison of the four external carbon sources, NaHCO3 was determined as more suitable carbon source than CH3COONa, C6H12O6 and Na2CO3. Adding 100 mg·L?1 NaHCO3 in the simulated sewage, the removal rates of ammonia nitrogen (${\rm{NH}}_4^ + $-N), total nitrogen (TN), total phosphorus (TP) and COD were 98.7%, 78.6%, 71.6% and 100%, respectively. Through evaluating the effect of NaHCO3 on the growth of O. brevicingulatum and activated sludge by Monod kinetic method, the growth acceleration of O. brevicingulatum by NaHCO3 was more than that of activated sludge. Furthermore, a self-designed biofilm reactor with the symbiosis system was used to treat actual urban sewage, the nitrogen and phosphorus indicators in the effluent could reach the level A discharged standard of urban sewage after when NaHCO3 was added to increase the carbon source concentration in the influent. Key words:external carbon source/ symbiotic system of algae and bacteria/ removal of nitrogen and phosphorus/ urban sewage.
图1固定化藻菌生物膜反应器实物图 Figure1.Photos of immobilized algae-sludge biological reactor
图2短带鞘藻-活性污泥共生体系对模拟污水中${\rm{NH}}_4^ + $-N、TN、TP和COD的去除效果 Figure2.Removal effect of ${\rm{NH}}_4^ + $-N, TN, TP and COD in synthetic wastewater by the symbiosis system of O.brevicingulatum and activated sludge
图34种外加碳源对短带鞘藻-活性污泥共生体系去除氮、磷和COD的影响 Figure3.Treatment of nitrogen, phoshpours and COD by the symbiosis system of O. brevicingulatum and activated sludge with four carbon sources
图4碳酸氢钠初始浓度对短带鞘藻-活性污泥共生体系去除氮、磷和COD的影响 Figure4.Removal efficiencies of nitrogen, phosphorus and COD by the symbiosis system of O. brevicingulatum and activated sludge at different NaHCO3 initial concentrations
图6碳酸氢钠的投加时间对短带鞘藻-活性污泥共生体系去除氮、磷和COD的影响 Figure6.Removal efficiencies of nitrogen, phosphorus and COD by O. brevicingulatum and activated sludge symbiosis system at different NaHCO3 addition time
图7外加碳酸氢钠对短带鞘藻和活性污泥去除氮、磷和COD的影响 Figure7.Effect of NaHCO3 addition on the removal of nitrogen, phosphorus and COD by O. brevicingulatum or activated sludge
图8固定化藻菌反应器处理实际城镇污水氮、磷和COD的去除效果 Figure8.Removal efficiencies of nitrogen, phosphorus and COD from actual urban sewage by immobilized algal-bacteria biological reactor
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Acceleration of NaHCO3 on the removal of nitrogen and phosphorus in urban sewage by the symbiosis system of Oedogonium brevicingulatum and activated sludge
1.College of Environment and Resources, Xiangtan University, Xiangtan 411105, China 2.Key Laboratory of Efficient Purification and Application of Complex Heavy Metal Wastewater in Hunan Province, Xiangtan 411105, China Received Date: 2020-09-21 Accepted Date: 2020-12-23 Available Online: 2021-04-23 Keywords:external carbon source/ symbiotic system of algae and bacteria/ removal of nitrogen and phosphorus/ urban sewage Abstract:The symbiosis system of algae and bacteria has the advantages of high efficiency, low consumption, and resource utilization in sewage treatment. However, the COD of most urban sewage treatment plants has been generally lower than expected thus reduces the removal rate of nitrogen and phosphorus in the upgrading process of achieving the level A discharged standard of urban sewage (GB 18918-2002). On the basis of constructing a symbiosis system of O. brevicingulatum and activated sludge, an external carbon source was used to promote its removal effect of nitrogen and phosphorus from urban sewage. The results showed that the optimized process conditions for the symbiosis system of O. brevicingulatum and activated sludge were as follow: the dry weight ratio of algae and bacteria was 3∶1, the initial biomass was 0.3 g·L?1, the aeration rate was 0.2 L·min?1, and the aeration and intermission interval was 6 h/6 h. After comparison of the four external carbon sources, NaHCO3 was determined as more suitable carbon source than CH3COONa, C6H12O6 and Na2CO3. Adding 100 mg·L?1 NaHCO3 in the simulated sewage, the removal rates of ammonia nitrogen (${\rm{NH}}_4^ + $-N), total nitrogen (TN), total phosphorus (TP) and COD were 98.7%, 78.6%, 71.6% and 100%, respectively. Through evaluating the effect of NaHCO3 on the growth of O. brevicingulatum and activated sludge by Monod kinetic method, the growth acceleration of O. brevicingulatum by NaHCO3 was more than that of activated sludge. Furthermore, a self-designed biofilm reactor with the symbiosis system was used to treat actual urban sewage, the nitrogen and phosphorus indicators in the effluent could reach the level A discharged standard of urban sewage after when NaHCO3 was added to increase the carbon source concentration in the influent.
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