Efficient and accurate phosphorus removal system for slowing down membrane blockage and phase membrane corrosion

Abstract

The invention discloses an efficient and accurate phosphorus removal system for slowing down membrane blockage and phase membrane corrosion. The efficient and accurate phosphorus removal system comprises an online monitoring module, a PLC control module, a model calculation module and an automatic dosing module. The PLC control module adopts a feedforward superposition feedback control strategy, takes orthophosphate concentration of a water outlet of the A2O biological pool and total inflow as feedforward control signals, determines an accurate phosphorus removal agent amount required by phosphorus removal, the orthophosphate concentration of the water outlet of the MBR membrane pool is used as a feedback control signal for checking and valuing the adding amount of the phosphorus removal agent, and the PLC control module transmits a dosing quantity signal to the automatic dosing module to perform frequency conversion control dosing, so that feedback control is realized to adjust the dosing quantity. According to the phosphorus removal system, the dosage of chemicals can be reduced, it is guaranteed that the total phosphorus (TP) of effluent of a sewage plant reaches the standard, membrane pollution and phase membrane corrosion, caused by iron ions in the phosphorus removal agent, of an MBR membrane are effectively relieved, and refined operation management of the sewage plant is achieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an efficient and precise phosphorus removal system for slowing membrane clogging and phase membrane corrosion. Background technique [0002] With the rapid development and modernization process of the national chemical industry, phosphorus chemical industry has developed rapidly and achieved encouraging results, but at the same time, environmental problems are becoming more and more serious. In order to minimize the eutrophication of water bodies caused by phosphorus pollution, the state has continuously raised the effluent standards of sewage plants, from the first-class B standard in the "Urban Wastewater Treatment Plant Pollutant Discharge Standard" (GB18918-2002) to the first-class A Standards (phosphorus content not higher than 0.5mg / L), some of the urban sewage treatment plant effluent standards have even been raised to Class IV standards for surface water (phospho...

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Problems solved by technology

[0005] However, due to the unstable water quality and quantity of incoming water from sewage plants, especially for sewage treatment plants for overflow pollution control in the confluence area, the sewage volume is small and the concentration is high in sunny days, and the water volume is large in rainy days, and the load impact is large; at the same time, the design of phosphorus removal in sewage plants is generally The method of manually controlling the dosage of phosphorus removal is limited to the level of sewage plant operators, and it is impossible to adjust the dosage in real time. In order to ensure that the effluent of the sewage plant meets the standard, the method of excessive dosage of phosphorus removal chemicals is generally used during the operation of the sewage plant, resulting in Reduce unnecessary waste and increase the operating cost of the sewage plant

when in A 2 When an excessive amount of iron-based phosphorus removal agent is added to the outlet of the aeration tank of the O process, a large amount of iron ions will be brought into the MBR membrane pool. Increase the particle size of sludge particles to reduce the risk of membrane fouling, but excessive iron ions will inhibit microbial activity, causing a sharp increase in the concentration of extracellular polymers (EPS) and aggravating membrane fouling

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