Bio-diatomite dynamic membrane reactor for micro-polluted surface water treatment

Abstract

Keywords:Bio-diatomite dynamic IntroductionThe dynamic membrane technology for wastewater treatment has gained great attention in recent years due to its cost-effective membrane module, reduced energy consumption and high effluent quality. Therefore, it is considered as a substitute to the conventional membrane bioreactor (MBR) (Kiso et al., 2004;Gander et al., 2000;Chu and Li, 2006). Dynamic membrane is formed on the underlying support mesh when filtering a solution containing fine particles, thus is also called secondary membrane (Kuberkar and Davis, 2000). The dynamic membrane formed on the relatively large-pore mesh increases the intrinsic membrane retention capacity (Alavi Moghaddam et al., 2002a,b), leading to a high solid-liquid separation efficiency and a high filtration flux (Seo et al., 2002(Seo et al., , 2007Fuchs et al., 2005). Dynamic membrane is also more convenient to clean than membrane reactor. Tap water backwash, air backwash or mechanical brushing can readily clean the dynamic membrane without using any chemical reagents (Al-Malack and Anderson, 1997;Fan and Huang, 2002;Ye et al., 2006). It was reported that diatomite particles could be used as carriers for microorganisms (Zhao et al., 2006). The microbial colonies can form zoogloeas on diatomite particles through microbial capsules and surface mucus and bio-diatomite is thus named. The bio-diatomite reactor, which combines * Corresponding author. Tel.: þ86 21 65982691; fax: þ86 21 65982313.E-mail addresses: chq123zl@hotmail.com (H. Chu), dbz77@tongji.edu.cn (B. Dong).A v a i l a b l e a t w w w . s c i e n c e d i r e c t . c o m j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / w a t r e s w a t e r r e s e a r c h 4 4 ( 2 0 1 0 ) 1 5 7 3 -1 5 7 9

Startup pattern and performance enhancement of pilot-scale biofilm process for raw water pretreatment

“…The major quality are summarized in Table 1. This kind of water is similar to polluted raw water in Eastern China according to the on-the-spot investigation and related literature (Chu et al, 2010;Feng et al, 2013;Zhang et al, 2013).…”

“…Thereinto, the pollution of drinking water source directly threatens the drinking water safety (Chu et al, 2010;Zhang et al, 2013). For example, the major pollutants such as ammonia and organics existing in water could complicate the chlorination process and form disinfection byproducts (Chowdhury et al, 2009;Benner et al, 2013;Han et al, 2013), which would cause health problems to people.…”

Biomimetic Adsorbents: Enrichment of Trace Amounts of Organic Contaminants (TAOCs) in Aqueous Solution

“…In contrast, the latter mechanism was absent for sulfamethoxazole as this compound is rather hydrophilic. Chu et al (2010) investigated the feasibility of treating micro polluted surface water for drinking water production with a bio-diatomite dynamic membrane reactor (BDDMR) at a laboratory-scale-discontinuous-flow mode. Results indicated that the BDDMR was effective in removing trihalomethanes' formation potential (THMFP) at a hydraulic retention time (HRT) of 3.5 h due to its high concentrations of mixed liquor suspended solids (MLSS) and mixed liquor volatile suspended solids (MLVSS).…”

Coagulation-dynamic membrane filtration process at constant flow rate for treating polluted river water

“…Compared with traditional membranes, inexpensive materials, high filtration flux, better filtration performance, and easy formation from various substances are very attractive features of dynamic membrane [4,5]. Therefore, it is considered as a substitute for the conventional membrane reactor [6,7].…”

“…Chu et al [7,16] used biodiatomite dynamic membrane reactor for micro-polluted surface water treatment, the results showed it is advantageous in high filtration flux, long filtration time, and excellent solid-liquid separation capacity, and Pollutants could be removed effectively by the reactor. But, they believed that the removal of pollutants was mainly ascribed to microbial degradation and the membrane alone; PAC-diatomite absorption was much less effective in removing pollutants.…”