Method and device for cleaning high-efficiency water-saving medicine-saving membrane unit

Abstract

The invention discloses a method and a device for cleaning a high-efficiency water-saving medicine-saving membrane unit. The method comprises the following steps: allowing reclaimed water subjected to MBR treatment to pass through three bubble pools, a clean-water reservoir and two dosing pools, adding 1000kg of 13 mass percent of sodium hypochlorite solution and 25+ / -0.1kg of industrial sodium hydroxide, and stirring until the sodium hydroxide is completely dissolved; moving the membrane unit into the clean-water reservoir, mixing the reclaimed water and gas to perform continuous and effective air scrubbing and water scrubbing on membranes which are difficultly cleaned in a membrane box, and cleaning organic matters such as activated sludge attached to the membranes on the surface of the membrane box and in the membrane unit; transferring the membrane unit into the dosing pools, performing bottom aeration, jittering to blow out the sludge on the membranes in the membrane unit, and effectively cleaning the membranes through air bubbles generated by air aeration. According to the method and device, the waste of dose is effectively reduced, the membrane flux is improved, and the effluent amount and water quality stability of the MBR process are guaranteed.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a cleaning method and device for an efficient water-saving and drug-saving membrane assembly. Background technique [0002] Membrane biological method refers to a sewage treatment method that uses membrane as a separation medium instead of conventional gravity precipitation solid-liquid separation to obtain effluent, and improves the reaction process and reaction efficiency; the membrane unit is a gas supply device, water collection device, hollow fiber curtain membrane It is a basic water treatment unit assembled with sheets, membrane boxes, etc., and is a device for solid-liquid separation in membrane biological wastewater treatment projects; MBR is composed of microfiltration (MF), ultrafiltration (UF) or nanofiltration (NF) membrane modules Composed of bioreactors, according to the different functions of membrane modules in bioreactors, they can be divided into s...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a cleaning method and device for a highly efficient water-saving and chemical-saving membrane module, which solves the complicated operations such as manual movement and assembly when cleaning the inside of the membrane module; effectively reduces the problem of large water volume when the membrane module is cleaned off-line Disadvantages: Effectively reduce the short recovery time of online alkali cleaning membrane flux and increase the waste of cleaning frequency and dosage; through this method, cooperate with online cleaning to improve the membrane flux of the membrane used in the MBR process when the life span is over half; ensure the MBR process Water output and water quality are stable

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