Abstract
The aim of this work was to investigate the biomass proliferation and its impact on the operation of a submerged membrane bioreactor (sMBR). A programmable logic controller (PLC) was used to control the process of the sMBR with no discharge of sludge. When MLSS was 9670 mg/L and the solid retention times (SRT) ranged from 20 to 40 days, the optimal removal efficiencies of COD, NH3-N, TP were 93.89%, 93.02%, 80.57%, respectively. Accompanying with the decreasing of the sludge loading, the substrate and nutrition were insufficient in the sMBR, leading to endogenous respiration of the activated sludge, which decreased the activity of sludge and resulted in the death of more microorganisms.
Highlights
Submerged membrane bioreactor is a water treatment process combining high efficiency membrane separation technology with biological treatment characteristics of activated sludge
Due to the interception of the membrane, there is no need for the secondary sedimentation tank to separate solid and liquid, all the biomass can stay in the reactor and reach a high concentration, which makes the process has the advantages of a small footprint, high quality of effluent, complete solid-liquid separation and so on[1]
In the process of operation, membrane components are prone to be polluted, resulting in a decrease in membrane flux and membrane performance, resulting in an increase in operating costs, which hinders its widespread application in practice[2].Study showed that the concentration of biomass is one of the important influence parameter on running the Submerged membrane bioreactor (sMBR) reactor [3], it affects the removal efficiency of pollutants, and affects the viscosity[4], extracellular polymer (EPS) content[5] and other characteristics of sludge in sMBR
Summary
Submerged membrane bioreactor (sMBR) is a water treatment process combining high efficiency membrane separation technology with biological treatment characteristics of activated sludge. MLSS and MLVSS were important indicators of microbial biomass in the sludge mixture, which’s changes reflect the microbial proliferation in the bioreactor [9].By increasing the organic load at each stage of the experiment, which promoted the proliferation of biomass in the system, and investigated the proliferation of biomass in sMBR.
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