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首页> 外文期刊>Journal of Environmental Engineering >Simultaneous Nitrogen and Phosphorus Removal from High-Strength Industrial Wastewater Using Aerobic Granular Sludge
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Simultaneous Nitrogen and Phosphorus Removal from High-Strength Industrial Wastewater Using Aerobic Granular Sludge

机译：好氧颗粒污泥同时去除高强度工业废水中的氮和磷

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Aerobic granular sludge technology was applied to the simultaneous nitrogen and phosphorus removal from livestock waste_water that contains high concentrations of nitrogen and phosphorus (TN: 650 mg/L; TP: 125 mg/L). A lab-scale sequencing batch reactor was operated in an alternating anaerobic/oxic/anoxic denitrification mode. Granular sludge was first formed using synthetic wastewater. When livestock wastewater was diluted with tap water, the shape and settleability of aerobic granular sludge were maintained even though livestock wastewater contained suspended solids. Simultaneous nitrification, denitrification, and phosphate uptake were observed under an aerobic condition. However, when nondiluted livestock wastewater was used, the diameter of granular sludge and the denitrification efficiency under an oxic condition decreased. When the concentrations of nitrogen and phosphorus in wastewater increased, hydraulic retention time (HRT) increased resulting in a decrease in selection pressure for granular sludge. Therefore, the sustainment of granular sludge was difficult in livestock wastewater treatment. However, by applying a new excess sludge discharge method based on Stokes' law, the shape of granular sludge was maintained in spite of the long HRT (7.5 days). To select large granular sludge particles, excess sludge was discharged from the upper part of settled sludge because small particles localized there after settling. Finally, excellent nitrogen and phosphorus removal was accomplished in practical livestock wastewater treatment. The effluent concentrations of NH_4_N, NO_x_N, and PO_4_P were <0.1, 1.4, and 1.2 mg/L, respectively.
机译：需氧颗粒污泥技术被应用于同时从含有高浓度氮和磷（TN：650 mg / L; TP：125 mg / L）的牲畜废水中去除氮和磷。以交替的厌氧/有氧/缺氧反硝化模式运行实验室规模的测序间歇反应器。首先使用合成废水形成颗粒污泥。用自来水稀释畜禽废水后，即使畜禽废水中含有悬浮固体，好氧颗粒污泥的形状和沉降性也得以保持。在有氧条件下观察到同时硝化，反硝化和磷酸盐吸收。然而，当使用未稀释的家畜废水时，颗粒污泥的直径和在有氧条件下的反硝化效率降低。当废水中氮和磷的浓度增加时，水力停留时间（HRT）增加，导致颗粒污泥的选择压力降低。因此，在畜禽废水处理中难以维持颗粒状污泥。但是，通过采用基于斯托克斯定律的新的剩余污泥排放方法，尽管HRT较长（7.5天），但仍可以保持颗粒状污泥的形状。为了选择大的颗粒污泥颗粒，由于沉降后小颗粒位于那里，因此从沉降污泥的上部排出过量的污泥。最后，在实际的畜禽废水处理中实现了出色的氮和磷去除效果。 NH_4_N，NO_x_N和PO_4_P的出水浓度分别<0.1、1.4和1.2 mg / L。

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