The purpose of this study is to investigate the effect of Free Nitrous Acid (FNA) and Free Ammonia (FA) on enhanced biological phosphorus removal (EBPR) and in particular on the aerobic phosphorus uptake rate (PUR). To this end, a PAO-enriched biomass was developed at a lab-scale reactor in order to fuel a series of ex-situ batch experiments to test the effect of various nitrite or ammonium concentrations on the phosphorus uptake rate at different pH values. FNA was found to be a strong inhibitor of EBPR, in agreement with other studies with PUR being inhibited by 50 % under 1.5 μg HNO₂–N L⁻¹ and 100 % at 13 μg HNO₂–N L⁻¹. FA was also found to inhibit EBPR with PUR being inhibited by 50 % under 6.4 mg NH₃–N L⁻¹. The results of this study suggest that EBPR under high nitrogen loading alongside nitritation-denitritation may not be a viable option.

本研究的目的是研究游离亚硝酸 (FNA) 和游离氨 (FA) 对增强生物除磷 (EBPR) 的影响，特别是对有氧磷吸收率 (PUR) 的影响。为此，在实验室规模的反应器中开发了富含 PAO 的生物质，以便为一系列异地批量实验提供燃料，以测试各种亚硝酸盐或铵浓度对不同 pH 值下磷吸收率的影响。发现 FNA 是 EBPR 的强抑制剂，这与其他研究一致，其中 PUR 在 1.5 μg HNO ₂ –NL ^-1下被抑制 50%，在 13 μg HNO ₂ –NL ^-1下被抑制100% 。还发现 FA 可抑制 EBPR，其中 PUR 在 6.4 mg NH ₃下被抑制 50%–NL ^-1。这项研究的结果表明，高氮负荷下的 EBPR 和亚硝化-反亚硝化可能不是一个可行的选择。