侧流化学磷回收强化生物除磷的模拟预测与试验验证

Modeling prediction and experimental verification of enhancing bio-phosphorus removal by chemical precipitation of anaerobic digester supernatant

为了强化污水中生物除磷作用,本研究通过模拟预测与实验室试验验证了厌氧上清液侧流化学磷沉淀与回收对强化生物除磷的促进作用.模拟预测与试验结果表明,在进水COD/P=37.5工况下,当侧流比增加至30%时,通过化学磷沉淀(调节pH>9.0)可使出水中TP浓度从碳源抑制时的<6.0mg·mL-1(以P计)下降至≤1.0mg·mL-1(以P计),同时可回收进水中P负荷的64%.经验证与校正后的TUD数学模型模拟预测有着与试验结果近乎一致的效果.因此,数学模拟技术完全有可能取代中间试验过程而直接将小试结果放大至工程应用.

By means of modeling prediction and a lab-scale experiment,we tested bio-P removal by chemical-P precipitation in the side-stream of anaerobic digester supernatant.Both the modeling prediction and the experimental results indicate that TP in the effluent could be decreased to ≤1.0 mg·L-1 from 〉6.0 mg·L-1（in terms of P）at COD/P=37.5 by chemical-P precipitation with the side-stream ratio at 30%.At the same time,64% of the influent P load could be recovered.The verified and calibrated TUD model predicted almost the same results as those obtained from the experiment.Therefore,modeling technology is fully capable of replacing pilot-scale experiments in the scale-up of biological nutrient removal（BNR）processes.