Kodi flocculant ikhoza kuyikidwa mu dziwe la membrane la MBR?

Kudzera mu kuwonjezera kwa polydimethyldiallylammonium chloride (PDMDAAC), polyaluminum chloride (PAC) ndi composite flocculant ya ziwirizi mu ntchito yopitilira ya membrane bioreactor (MBR), adafufuzidwa kuti achepetse MBR. Zotsatira za membrane fouling. Mayesowa amayesa kusintha kwa MBR operating cycle, activated sludge capillary water absorption time (CST), Zeta potential, sludge volume index (SVI), sludge floc size distribution ndi extracellular polymer content ndi zina, ndikuwona reactor. Malinga ndi kusintha kwa activated sludge panthawi yogwira ntchito, njira zitatu zowonjezera ndi njira zoyezera zomwe zili zabwino kwambiri ndi activation yochepa ya flocculation zatsimikiziridwa.

Zotsatira za mayeso zikusonyeza kuti flocculant imatha kuchepetsa kuipitsidwa kwa nembanemba. Pamene ma flocculant atatu osiyanasiyana adawonjezedwa pa mlingo womwewo, PDMDAAC inali ndi zotsatira zabwino kwambiri pakuchepetsa kuipitsidwa kwa nembanemba, kutsatiridwa ndi ma flocculant ophatikizika, ndipo PAC inali ndi zotsatira zoyipa kwambiri. Poyesa mlingo wowonjezera ndi njira yosinthira mlingo, PDMDAAC, composite flocculant, ndi PAC zonse zidawonetsa kuti mlingo wowonjezera unali wothandiza kwambiri kuposa mlingo pochepetsa kuipitsidwa kwa nembanemba. Malinga ndi kusintha kwa transmembrane pressure (TMP) mu kuyesaku, zitha kudziwika kuti pambuyo powonjezera koyamba kwa 400 mg/L PDMDAAC, mlingo wabwino kwambiri wowonjezera ndi 90 mg/L. Mlingo woyenera kwambiri wowonjezera wa 90 mg/L ukhoza kukulitsa kwambiri nthawi yogwira ntchito ya MBR, yomwe ndi nthawi 3.4 kuposa ya reactor yopanda flocculant yowonjezera, pomwe mlingo woyenera kwambiri wa PAC ndi 120 mg/L. Chosakaniza cha flocculant chopangidwa ndi PDMDAAC ndi PAC chokhala ndi chiŵerengero cha 6:4 sichingochepetsa kuipitsidwa kwa nembanemba kokha, komanso kuchepetsa ndalama zogwirira ntchito zomwe zimayambitsidwa ndi kugwiritsa ntchito PDMDAAC yokha. Kuphatikiza kukula kwa TMP ndi kusintha kwa mtengo wa SVI, zitha kudziwika kuti mlingo woyenera wa chowonjezera cha flocculant chophatikiza ndi 60mg/L. Pambuyo powonjezera flocculant, imatha kuchepetsa CST ya chisakanizo cha matope, kuwonjezera Zeta potential ya chisakanizo, kuchepetsa mtengo wa SVI ndi kuchuluka kwa EPS ndi SMP. Kuwonjezeredwa kwa flocculant kumapangitsa kuti flocculant yoyatsidwa ikhale yolimba kwambiri, ndipo pamwamba pa gawo la nembanemba. Chosakaniza cha keke chopangidwacho chimakhala chocheperako, ndikuwonjezera nthawi yogwira ntchito ya MBR pansi pa kuyenda kosalekeza. Chosakaniza sichimakhudza bwino khalidwe la madzi a MBR. Chosakaniza cha MBR chokhala ndi PDMDAAC chili ndi chiŵerengero chapakati chochotsera cha 93.1% ndi 89.1% cha COD ndi TN, motsatana. Kuchuluka kwa madzi otuluka m'thupi kumakhala pansi pa 45 ndi 5mg/L, kufika pa mlingo woyamba wa A.

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