Ultrafiltration aeration and alkalifying iron removal method and system

Abstract

The invention provides an ultrafiltration aeration and alkalifying iron removal system, and belongs to the field of wastewater treatment. The system comprises a raw water container, an immersed ultrafiltration device, a manganese sand filter, a security filter and a reverse osmosis device, wherein a pipeline mixer is arranged between the raw water container and the immersed ultrafiltration device,and the raw water device, the pipeline mixer, the immersed ultrafiltration device, the manganese sand filter, the security filter and the reverse osmosis device are sequentially connected through pipelines. A NaOH solution is added into the pipeline mixer to make Fe<2+> and Fe<3+> in water form Fe(OH)2 and Fe(OH)3 precipitates, and continuous aeration is carried out in an ultrafiltration membranepool to oxidize Fe<2+> in water into Fe<3+>, so the purposes of energy conservation and consumption reduction are achieved.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to an ultrafiltration aeration and alkali addition iron removal method and system thereof. Background technique [0002] The raw water enters the manganese sand and reverse osmosis system after being filtered by the ultrafiltration system. Since the iron content in the raw water is relatively high, the ferric iron can be intercepted by the submerged ultrafiltration, and the ferrous iron will melt into the water and block the filter element of the security filter. The security filter element needs to be replaced in less than one day during operation. In order to prolong the use of the security filter and achieve the purpose of saving energy and reducing consumption, the ultrafiltration system is now optimized. [0003] CN111072182A discloses a device for iron red wastewater treatment, which includes a raw water pool, a precision filter, an ultrafilter, an intermediate pool, and a...

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Problems solved by technology

[0006] In the Chinese patent document CN111072182A, iron red wastewater is mainly treated by filtration, which is not only simple in operation and management, but also can ensure that the treated sewage can be discharged up to the standard, but it cannot be recycled.

Patent documents CN110818060A and CN110407414A all disclose Fe by oxidation 2+ rapid oxidation to Fe 3+ Among them, the patent document CN110818060A provides oxygen through aeration to oxidize ferrous iron to ferric iron, and the patent document CN110407414A also dissolves the oxygen continuously produced in the continuous oxygen production pool into the acid mine wastewater and wastewater Fe 2+ Rapidly oxidized to Fe in the oxidation sedimentation tank 3+ , but the above-mentioned two patent documents CN110818060A and CN110407414A all did not add treatment agents, and they were recycled after reclaimed water treatment

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