The feasibility study of using non-woven MBR for reduction of hydrolysed biosolids

In this study, non-woven MBR was used to treat hydrolysed biosolids wasted from a biological treatment plant. The concentration of SS of hydrolysed biosolids in influent was 10,000 mg/L and the concentration of SS in effluent was less than 200 mg/L with/without discharging wasted sludge depending on different HRTs, i.e. 20, 15 and 10 d. The results indicated that the percentage of biosolids reduction in terms of SS removal efficiency in non-woven MBR was around 65, 60 and 35%, respectively, depending on different HRTs. Meanwhile, the ratio of VSS/SS was decreased from 0.78 to 0.50 and the number of smaller inorganic particle sizes increased due to extended SRT. The initial flux in the non-woven MBR was set at 0.02, 0.04 and 0.06 m3/m2/day and trans-membrane pressure (TMP) was less than 10 kPa. The permeate flux could be maintained quite stably due to lower TMP. The proposed non-woven MBR could be used to achieve the reduction of biosolids in the wastewater treatment plant.