Method and device for treating micro-polluted surface water

Abstract

The invention provides a method and a device for treating micro-polluted surface water. The method comprises the following steps: a biological filter, coagulation sedimentation and ultrafiltration are combined; raw water enters the biological filter; microorganisms degrade the ammonia nitrogen and partial low molecular weight organic matters in the inlet water; organic matters which are hard to be degraded by the microorganisms, such as humus, are removed from the outlet water through coagulation sedimentation; finally organic matters, most turbidity, microorganisms and partial viruses are further removed through an external ultrafiltration membrane module; the ultrafiltered outlet water is high quality drinking water after being disinfected and can be transported to users after chlorine supplement and ozonization; ultrafiltered concentrated solution reflows to a coagulation sedimentation pond and solid-liquid separation is realized by discharge of sludge from the sedimentation pond; the ultrafiltration membrane module is backwashed by a membrane backwashing system periodically during ultrafiltration operation. The invention organically combines biodegradation, coagulation and physical interception of ultrafiltration, has good effect on removing ammonia nitrogen, organic matters and the like in the micro-polluted surface water and is a novel drinking water deep purification process.

Description

technical field [0001] The invention relates to a water treatment process and equipment, in particular to a process method and device for treating slightly polluted surface water with a combination process of biofilter-coagulation sedimentation-ultrafiltration membrane, belonging to the technical field of advanced purification treatment of drinking water. Background technique [0002] In the face of changes in water quality, conventional drinking water treatment processes have become inadequate. Experimental research and actual production results at home and abroad show that conventional coagulation, sedimentation and filtration processes can only remove 20% to 30% of the organic matter in the polluted source water, and the presence of dissolved organic matter is not conducive to destroying the stability of the colloid The removal effect of the conventional process on raw water turbidity is significantly reduced (only 50% to 60%). To improve the treatment effect by increasi...

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Problems solved by technology

[0005] Patents involving ultrafiltration treatment of slightly polluted water as drinking water, such as "Ultrafiltration Membrane Coagulation / Adsorption / Bioreactor Integrated Water Advanced Treatment Method and Device" 200810063897.7, adopt an integrated device situation and save floor space At the same time, there is the problem of low operating flux; the patent "ultrafiltration-jet supplementary ozone-ultraviolet secondary excitation to generate free radicals to purify micro-polluted source water technology and process" 02128903.4, while ultraviolet disinfection and secondary excitation of water Dissolved oxygen and ozone generate strong oxidizing free radicals, which can kill various pathogens and remove suspended solids, etc., but cannot remove ammonia nitrogen in micro-polluted surface water; "Combined Ultrafiltration Membrane Treatment Device for Drinking Water Treatment" 200420109820.6 The utility model is the optimization of the combination of disinfection method and ultrafiltration, which does not involve biological pretreatment, and cannot remove ammonia nitrogen in slightly polluted surface water, etc.

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