摘要:
为研究厌氧释磷过程中的影响因素,以连续流A2N双污泥中试污泥为样品,考察了碳源种类、碳源浓度、pH值以及温度对反硝化除磷污泥厌氧释磷的影响。结果表明:乙酸为碳源时释磷效果最佳,其次是葡萄糖,甲醇为碳源时释磷效果较差。MLSS为1 200 mg/L左右时,投加200 mg/L的COD即可保证充分释磷。pH值为6.3~8.8,对厌氧释磷效果影响不大,适当提高pH值有利于提高释磷速率。温度为20~3>0℃,释磷效果较好。另外,实验同时研究了反硝化除磷污泥分别利用不同电子受体(硝氮、氧气)的吸磷特性。以硝氮为电子受体的反硝化吸磷过程中,前15min的反硝化吸磷脱氮速率最高,吸磷速率与反硝化速率分别为11.5、10.4 mgN/gVSS·h;以氧气为电子受体的好氧吸磷过程中,前15 min的好氧吸磷速率最高,达到20.4 mgP/gVSS·h,大约为反硝化吸磷的2倍。
Abstract:
In this paper, in order to study the influential factors during the process of anaerobic phosphorus release, pilot sludge of the continuous-flow A2 N double sludge system was taken as an example to investigate the influences of carbon type, carbon source concentration, pH value and temperature on anaerobic phosphorus release of denitrifying phosphorus-removing sludge. The results showed that acetate was the optimal carbon source for anaerobic phosphorus release, followed by glucose, while methanol was an ineffective carbon source for phosphorus release. Under the condition that MLSS was about 1 200 mg/L, input of 200 mg/L of COD was sufficient for phosphorus release. When pH value was 6.3~8.8, there was no obvious effect on phosphorus release, so appropriate increase of pH value would speed up the phosphorus release. Within the temperature range of 20~30 ℃, phosphorus release was fine. Moreover, in the experiments, characteristics of phosphorus uptake of denitrifying phosphorus-removing sludge by utilization of different electron acceptors such as nitrate or oxygen was also studied. During the process of denitrifying phosphorus uptake with nitrate as electron receptor, the rates of anoxic phosphorus uptake and denitrification in the initial 15 minutes were highest, reaching to 11.5 and 10.4 mgN/gVSS ·h respectively. During the process of aerobic phosphorus uptake with oxygen as electron receptor, the rate in the initial 15 minutes was highest, reaching to 20.4 mgP/gVSS ·h, which was about twice as much as that of denitrifying phosphorus uptake.
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