Abstract
A large amount of domestic wastewater is produced in our daily life. To sustainably use the urban domestic wastewater in the residential area and develop the equipment for distributed domestic wastewater treatment, the present work carried out a pilot study on the treatment of domestic wastewater by sequencing batch membrane bioreactor (SBMBR). Under the conditions of 20 L/h·m2 of average water flux, and 2 h/3 h of anaerobic/aerobic period, the SBMBR process showed a good treatment effect with a good quality of effluent (<50 mg/L of chemical oxygen demand (COD), <5 mg/L of ammonia nitrogen (NH3-N), <15 mg/L of total nitrogen (TN), <2.6 NTU of turbidity, 96.9% of color removal and 99.9% of bacteria removal). The aeration quantity had a certain degree of impact on the removal of COD and the optimum aeration rate was 13.9 m3/m3·h considering both the effectiveness and cost. When the SBMBR was continuously operated for 40 days, the transmembrane pressure reached 50 kPa and the membrane needed to clean. The hydrochloric acid (pH ≈ 2) was a suitable cleaning agent and the membrane was almost completely restored after cleaning.
Highlights
Water recycling and reuse is an effective measure to solve the shortage problem of water resource, and the sustainable use of water resource has become a national development strategy in China
To sustainably use the urban domestic wastewater in the residential area and develop the equipment for distributed domestic wastewater treatment, the present work carried out a pilot study on the treatment of domestic wastewater by sequencing batch membrane bioreactor (SBMBR)
Looking back on the development course of sewage treatment in the 20th century, we have found that centralized sewage treatment has obvious historical limitations, when we consider the reuse of sewage in the water shortage today
Summary
Water recycling and reuse is an effective measure to solve the shortage problem of water resource, and the sustainable use of water resource has become a national development strategy in China. Current technologies applied in water reclamation include oxidation-chlorination by sodium hypochlorite (NaClO), ultraviolet (UV) irradiation and ozonation, biological treatments such as aerobic/anaerobic bioreactors, maturation ponds and constructed wetlands, physical separations such as medium filtration and membrane filtration, and electrochemical treatments [4]. MBR technology has gradually been applied for the treatment of domestic and industrial wastewaters in recent years [11] It replaces the separation unit of the conventional activated sludge method with the membrane separation system, and simplifies the process, improves the effects of liquid-solid separation and obtains quality effluent for direct recycling use, such as agricultural and landscape irrigation, industrial processes and toilet flushing. The objective is to optimize the parameters and accumulate the data and experience for the application of such process in the distributed sewage treatment
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