Gravity filtration performances of the bio-diatomite dynamic membrane reactor for slightly polluted surface water purification

Abstract

A bio-diatomite dynamic membrane (BDDM) reactor for surface water treatment under a water head of 30, 40, 50, 60 and 70 cm, respectively, was investigated, which was very effective for pollutants removal. The water head exerted strong influences on filtration flux of BDDM during the precoating process, as well as on the formation of BDDM and turbidity variations. A high filtration flux (approximately 200-300 L/m2 h) could be achieved in the long filtration times of BDDM with a stable effluent turbidity of approximately 0.11-0.25 NTU. The BDDM could remove particles larger than 25 μm completely. The adopted sintered diatomite mainly consisted of macro pores, which were beneficial for improving the filtration flux of BDDM. During the backwash stage, the BDDM could be removed completely by the air backwash.

Application of wastewater treatment in sustainable design of green built environments: A review

“…Hybrid membrane process with biological granular activated carbon [113] Domestic water and wastewater treatment High potential to efficiently treat polluted surface waters, commercially available Powdered activated carbon (PAC) concentration, PAC age, filtration cycles Membrane bioreactor hybrid system (MBR-HS) including granular activated carbon-sponge fluidized bed bioreactor (GACS-FBBR) followed by a submerged membrane bioreactor (MBR) [114] Municipal wastewater treatment…”

“…During this process, certain substances such as activated sludge [110], diatomite [111], kaolin clay and powder-activated carbon (PAC) [112,113] are applied to generate the main activated carbon substance and the nylon membrane. A stainless mesh is used as a supporting layer in DMR [114]. This method is considered to be more efficient in comparison to the other hybrid membrane wastewater processes used in municipal wastewater treatment plants, such as MBRs.…”

Formation of pre-coating dynamic membrane on mesh filter by cross-flow filtration of PAC–water suspension in a bioreactor: experimental and modeling

“…But there has been limited information about mechanism and process of pre-coating dynamic membrane. Chu et al [15] investigated the pre-coating process for formation of bio-diatomite dynamic membrane bioreactor under a constant water head. They also evaluated the pollutant removal mechanisms in a bio-diatomite reactor to purify the micropolluted surface water [16].…”

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

“…Above researches indicate the use of the dynamic membrane in wastewater, and there are still some works which focus on the micro-polluted surface water treatment [16][17][18]. 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.…”