不同C/P下低耗EBPR的脱氮除磷及侧流磷回收性能

doi:10.19965/j.cnki.iwt.2021-0967

摘要/Abstract

摘要：

采用厌氧交替好氧（A/O）模式下运行的SBR反应器，考察低耗（DO=1.0 mg/L）条件下不同进水m（COD）/m（P）（记作C/P）对主流强化生物除磷（Enhanced biological phosphorus removal，EBPR）系统脱氮除磷效果及其相应的厌氧磷回收性能的影响。结果表明，当进水P浓度保持不变，C/P逐步降低（C/P=400/8、350/8、300/8）时，系统厌氧末期释磷量随进水碳源浓度的降低而逐步减小，相应的侧流磷回收率从61.5%降至45.3%，而磷去除率和出水磷达标率分别从96.7%和93.3%降至87.7%和30.0%，说明侧流系统的磷回收率和主流系统的除磷效率均受进水碳源浓度的影响，期间，NH₄ ⁺-N去除性能一直良好，TN去除率变化不大。继续降低C/P至400/12，在NH₄ ⁺-N去除性能不受影响而TN去除率提升3.8%的同时，主流EBPR系统的除磷率和出水磷达标率分别上升至97.4%和69.2%，相应的厌氧磷回收率达62.6%，说明影响主流系统除磷性能及侧流系统磷回收性能的主要因素是进水碳源浓度和磷源浓度，而与C/P关系不大。研究还发现，前3个实验阶段的污泥胞内多聚磷酸盐（Polyphosphate，poly-P）含量都有缓慢降低的趋势，最后1阶段呈上升趋势，这与污泥吸磷性能的趋势相一致，在整个实验阶段污泥沉降性能则始终变化不大。

关键词: 侧流磷回收, 厌氧上清液, 低耗, 强化生物除磷

Abstract:

A sequencing batch reactor（SBR） was operated with anaerobic alternating oxic（A/O） condition to investigate the effect of different m（COD）/m（P）（C/P ratio） on nitrogen and phosphorus removal performance of a mainstream EBPR（Enhanced biological phosphorus removal） under low consumption（DO=1.0 mg/L） and anaerobic side-stream phosphorus recovery efficiency. The results showed that the amount of phosphorus released at the end of the anaerobic phase gradually decreased due to the reduction of the influent carbon source when influent P concentration kept constant and C/P ratio gradually decreased（C/P=400/8，350/8，300/8）. The corresponding anaerobic side-stream phosphorus recovery rate decreased from 61.5% to 45.3%. Besides，the phosphorus removal rate and effluent phosphorus reaching standard rate dropped from 96.7% and 93.3% to 87.7% and 30.0%，respectively. It suggested that both side-stream phosphorus recovery performance and mainstream phosphorus removal rate were influenced by the concentration of carbon source. While NH₄ ⁺-N removal performance kept well and TN removal rate had little change during this period. As C/P decreased to 400/12，mainstream EBPR phosphorus removal rate and effluent phosphorus reaching standard rate increased to 97.4% and 69.2%，respectively. At the same time，TN removal rate increased by 3.8% but NH₄ ⁺-N removal performance not be affected. The corresponding anaerobic phosphorus recovery rate reached 62.6%. It showed that the main factors that affected the phosphorus removal performance of the mainstream system and the phosphorus recovery performance of the side-stream system were the influent carbon source concentration and the phosphorus source concentration，but had little relationship with the C/P ratio. It was also observed that poly-P（polyphosphate） content in cells during the first three stages displayed a slow decreasing trend and the last stage showed an upward trend，which was consistent with the phosphorus uptake performance of the sludge. The sludge settling performance kept stable in the whole test stage.

Key words: side-stream phosphorus recovery, anaerobic supernatant, low-consumption, EBPR

中图分类号:

X703.1

邓颖, 俞小军, 蔡雨麒, 马娟. 不同C/P下低耗EBPR的脱氮除磷及侧流磷回收性能[J]. 工业水处理, 2022, 42(7): 154-160.

Ying DENG, Xiaojun YU, Yuqi CAI, Juan MA. Performance of nitrogen and phosphorus removal and sidestream phosphorus recovery by low-consumption EBPR under different C/P ratio[J]. Industrial Water Treatment, 2022, 42(7): 154-160.

https://www.iwt.cn/CN/Y2022/V42/I7/154

图/表 8

图1 SBR实验装置 1—配水箱；2—蠕动泵；3—侧流反应池；4—空气压缩机；5—计算机；6—自动控制系统；7—pH探头；8—DO探头；9—转子流量计；10—排泥口；11—微孔曝气；12—电磁阀；13—电动搅拌器；14—Multi-3420在线测定仪

Fig. 1 SBR Experimental setup diagram

表1 反应器运行工况

Table 1 Operation conditions of the reactor

运行阶段	C/P	运行天数/d	温度/℃	MLSS/（mg·L^-1）	MLVSS/（mg·L^-1）
Ⅰ	400/8	1~15	22	3 337	2 680
Ⅱ	350/8	16~36	22	3 271	2 671
Ⅲ	300/8	37~57	22	3 118	2 552
Ⅳ	400/12	58~70	22	3 321	2 567

图2 SBR反应器脱氮除磷性能的变化

Fig. 2 Changes of nitrogen and phosphorus removal performance in SBR reactor

图3 不同阶段SBR反应器内出水TP

Fig. 3 Effluent TP concentration in SBR reactor under different stages

图4 不同阶段典型周期污染物浓度变化

Fig.4 Variation of pollutant concentration in a typical cycle at different stages

图5 SBR反应器内污泥释/吸磷能力

Fig. 5 Phosphorus release/uptake ability of sludge in SBR reactor

图6 进水C/P波动下侧流磷回收性能

Fig. 6 Side-stream phosphorus recovery performance under influent C/P ratio fluctuation

图7 不同阶段污泥性质变化

Fig. 7 Change of sludge characteristics in different stages

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