Greater attention and ongoing development work is happening in wast Water and particularly in MBRs. Hollow fiber , sheet and tubular are three types of configuration are available in market now a days. The process combines mixed liquor activated sludge, operating at high concentration, with ultrafilter membranes for biomass separation. Initially the process was limited to small wastewater flows where high quality treated effluent is required, due to high capital cost. With the awareness and ever increasing demands for higher effluent quality, MBRs are very much in demand and being applied in larger municipal sewage treatment plants as well as Industrial sectors now.
Tubular membranes configurations were developed in Netherlands, Germany and USA for use in MBRs and other processes respectively. The tubular membranes is most robust amongst other two membranes like hollow fiber and flat sheet membranes. Due to its life ,durability and economy it is being popular now a days and in much demand. BioCross® MBR is placed outside tank so easy for maintenance. Longer life and easy maintenance had made tubular membranes as most desirable alternative
By placing the tubular modules horizontally, and passing the Biomass through tubes at certain velocity from 1.5 mt/sec to 2.5 mt/sec, sequentially from 1 module till 8 modules we can generate from 1.5 M3 /Hr to 15 M3 /Hr product by Cross flow velocity without cleaning and backwash for a longer period. The helix inside the membranes will not allow to formation of cake inside the tubes and more flux is achieved than other membranes in market. It had proven that membrane flux is stable and fouling is less.
The flux is higher than submerged product system. High applied pressure and extremely high trans-membranes pressure (TMP) minimizes the amount and density of the solids boundary layer on the membrane surface.
This produces very stable flux and low fouling rates Flux Stability is enhanced due to helix configuration . Crossflow with back washable mode also can be provided for power savings if required. Less automation required and very simple operation by unskilled persons also. Cleaning is done or soaking cleaning solutions through the membrane module or soaking cleaning solutions through the membrane modules. This effectively keeps the membrane flux at high levels.