Supported biofilm apparatus and process
A biofilm and reactor technology, applied in sustainable biological treatment, biological water/sewage treatment, chemical instruments and methods, etc., can solve problems such as high operating costs and limited oxygen transfer rate
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[0059] Example description
[0060] 1.0 modular components
[0061] 1.1 fiber
[0062] Figures 1 and 1a show polyethylene (4-methylpentene-1) (PMP) fibers 10 that are hollow inside but have non-porous dense walls. In a set of fibers 10, fibers 10 may have different diameters and may be fine fibers with an outer diameter of less than 500 microns or less than 100 microns, eg, between 30 and 100 microns, or between 50 and 60 microns. The illustrated hollow fibers 10 are non-porous, or dense-walled, and water does not flow in advection through the fiber walls. However, oxygen or other gases may permeate or pass through the fiber walls, for example by molecular or dissociated diffusion.
[0063] The hollow fiber 10 can be produced by melt spinning, also known as melt extrusion. In melt spinning, polymer pellets, such as PMP pellets, are fed into the hopper of an extruder. The polymer pellets are heated and melted in the extruder and continue to be extruded to the spinneret ...
example 1
[0144] Example 1: Chemical Oxygen Demand (COD) Reduction in Membrane Supported Bioreactors
[0145] Using the modules shown in Figures 6-9, but using only a single fiber sheet module, a small bioreactor was fabricated. The length of the sheet is 0.57m and the height is 0.45m, assuming that biofilm growth is available on both sides of the sheet, providing about 0.5m 2 total biofilm area. The gas transfer surface area to attached biofilm surface area ratio is between about 5 and 6. The inlet air flow rate was 25 ml / min at a pressure of 34.5 kPa. The reactor volume is 30 L. Synthetic wastewater with a COD level of 1000 mg / L was introduced periodically in a batch manner. Synthetic wastewater consisted of 1.0 g / L soluble peptone and 0.03 g / L sodium hydrogen phosphate dissolved in tap water. A series of batch reactions were performed to determine the reaction rate and oxygen transfer efficiency. Figure 21 shows three batch periods: a three-day period from day 2 to day 5, a t...
example 2
[0146] Example 2: Small scale test of synthetic wastewater
[0147] A small bioreactor was designed using monolithic modules as described in Example 1. Synthetic wastewater with a COD level of 1000 mg / L was injected and treated with a biofilm on the module as described in Example 1. Calculate or measure and record COD removal rate and oxygen transfer rate and biofilm thickness. For about the first 21 days, the reactor (which had a fill volume of 30 L) was evacuated and refilled with feed after varying batch periods to keep the CODs in the tank essentially between 500 and 1000 mg / L. On days 8 and 16, in addition to emptying the tank and refilling with fresh feed, the modules were vigorously flushed with a water jet to remove biofilm. From about day 21 to day 30, the biofilm was starved (ie the tank was flooded with tap water, ie clean or potable water, while oxygen supply to the module continued) and air flushed. At about day 30, the tank was emptied and refilled with feed...
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