Wastewater Management
to 100,000 gpd and utilise the immersed MBR process – a novel wastewater treatment process designed by Siemens specifically for municipal and industrial applications, and land developers. At the same time, integrating biological process
with membrane separation technologies is a rapidly growing area. Here Siemens offers a hybrid group of technologies combined together in order to meet the requirements of specific user applications. For example a combination of the company’s Envirex biological processes, MemPulse membrane technology (Fig. 1) and SmartMBR Controls automation provides a reduction in energy, biosolids and footprint.
In addition, it is not only new developments that benefit from MBR technology – existing wastewater installations can, too. For example, an MBR, paired with an Envirex Orbal or vertical loop reactor (VLR) oxidation system and aerated anoxic process, is designed for operators seeking activated sludge, advanced secondary sludge treatment, simultaneous nitrification- denitrification, biological phosphorus removal or storm water treatment and reduced energy consumption. “Reengineering biological processes with a membrane bioreactor system unit can reduce footprint requirements and meet strict effluent regulations,” says the company. n
GE focuses on advanced primary treatment
L
EAPprimary, from GE, is an advanced primary treatment system that combines separation, thickening and dewatering of primary solids in a single compact unit. The LEAPprimary system performs the same function as a primary clarifier and fine screen in a typical MBR plant. According to the company, the performance advantages of combining its LEAPprimary and LEAPmbr technologies include: a 25 per cent reduction in energy needed for biological treatment; 20-40 per cent cost savings on primary treatment equipment needed for an MBR; and requires as little as one
tenth of the footprint as a conventional system. Proof of the benefits of the system come from a wastewater treatment plant in Southern Ontario, Canada, that replaced its conventional 2mm fine screen as a primary treatment with LEAPprimary in 2013. The LEAPprimary system proved to have a
positive impact on the membrane performance by enhancing the removal of particulate material from the wastewater prior to the MBR. Trash content (material in the mixed liquor greater than 2mm in size) was 60mg/l prior to the installation of the LEAPprimary unit. One month after the fine screen
AUMA BARTEC Barriquand Bosch
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was replaced with LEAPprimary the trash content reduced to near zero, which indicates that the material that could reduce ZeeWeed membrane life had been removed from the process. Process testing was also performed to quantify the total suspended solids (TSS) and chemical oxygen demand (COD) removal of the LEAPprimary system. Total suspended solids and chemical oxygen demand removal were measured at 50 per cent and 25 per ead SO Piccent respectively. The impact of this was a reduction in the air demand for biological process aeration in the bioreactor. n
Hillsheim Hoerbiger IChemE Inpro/Seal Keller-Druck M + W Group Mercury HMI Mucon
NETZSCH Pumpen & Systems Rotork
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11 29 20
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29 15 9 9 6
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