MBR membrane+NF/RO membrnae--a new type of combined process
The traditional single biochemical treatment method can no longer get the water discharge requirements of the “Household Landfill Pollution Control Standards”, and people are turning their attention to more efficient membrane separation technologies. Membrane separation techniques used in leachate treatment include ultrafiltration, nanofiltration, microfiltration, reverse osmosis, etc. Most leachate treatment uses two or more membrane combination processes to ensure that the effluent quality meets standards. At present, the leachate treatment membrane technology at home and abroad is mainly based on MBR+NF/RO treatment technology, and the actual engineering cases of traditional biochemical+nanofiltration+reverse osmosis technology applied to leachate treatment have also been reported.
MBR+NF/RO is a new type of combined process that has developed rapidly in recent years. It has the advantages of simple process, low investment and low operating cost, and is suitable for the leachate treatment project of small and medium towns.
1 Combination process introduction
MBR+NF/RO treatment technology adopts improved anaerobic landfill technology, the water quality of leachate is lower than traditional anaerobic landfill, biodegradability is also improved.
2 Process flow
Landfill leachate undergoes precipitation for a certain period of time in the leachate conditioning tank to remove part of the suspended solids, organic pollutants, and heavy metal ions in the wastewater. The high concentration leachate is transported to the medium-temperature anaerobic reactor through the submersible sewage pump, which can degrade some of the COD. , BOD5, and heavy metal ions, the effluent of the anaerobic reactor in the middle temperature flows into the integrated MBR reactor through gravity; the leachate with low concentration directly enters the MBR reactor through the conditioning tank; through the comprehensive action of biodegradation and membrane filtration in the MBR reactor, Further remove refractory organic contaminants in wastewater, remove NH3-N, nitrite nitrogen, nitrate nitrogen and heavy metal ions and most suspended solids; MBR effluent passes through high pressure pump to enter nanofiltration equipment, filter in nanofiltration membrane Under the action, decolorization is performed to remove the remaining refractory organic pollutants and metal ions. After the nanofiltration, the reverse osmosis unit in series can ensure that the water quality meets the high ammonia nitrogen standards, and finally passes through the activated carbon filter. Design water quality Water quality leachate discharge limits in general areas are implemented in the “GB 16889-2008 Pollution Control Standard for Domestic Waste Landfills”.
In actual operation, whether or not to select the reverse osmosis unit in series according to the influent leachate concentration is determined by whether or not the leachate influent concentration passes through the intermediate temperature anaerobic reactor. The returned sludge flows back from the M pool to the A pool. The remaining sludge is discharged into the sludge pool through the valve control through the water pressure; a sludge pump is installed in the sludge pool to transport the concentrated sludge to the landfill. Landfill treatment.
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