Printing and dyeing wastewater biochar filter saturated filler functional reutilization method

Abstract

The invention discloses a printing and dyeing wastewater biochar filter saturated filler functional reutilization method. The printing and dyeing wastewater biochar filter saturated filler functionalreutilization method is characterized by comprising extracting saturated granular activated carbon with enrichment of microorganisms and organic matters in a biological aerated filter, and feeding thesaturated granular activated carbon into a hydrothermally sealed reactor, feeding in iron powder, heating the reactor for hydrothermal reaction; after hydrothermal reaction is completed, cooling thereactor down to normal temperature, discharging materials and separating out ferric-carbon composite materials and hydrothermal liquid; feeding the ferric-carbon composite materials back into the biological aerated filter as the filler for in an intensified mode removing nitrogen, phosphorous and organic matters in printing and dyeing wastewater to achieve deep treatment on the printing and dyingwastewater; performing zerovalent iron Fenton reaction on the hydrothermal liquid to remove organic matters and heavy metal which are released into the hydrothermal liquid during the hydrothermal process, mixing processed effluent and the effluent of the biological aerated filter, and after the mixed effluent reaches the stand, discharging the effluent. The printing and dyeing wastewater biochar filter saturated filler functional reutilization method is simple in operation and easy to industrialize and provides a feasible method for functional utilization of printing and dyeing wastewater biochar filter saturated filler.

Description

technical field [0001] The invention relates to a method for functionalized reuse of saturated fillers in biochar filters of printing and dyeing wastewater, which belongs to the technical field of environmental protection. Background technique [0002] The general textile process includes: singeing, desizing, scouring, bleaching, dyeing, printing, finishing and other processes. Printing and dyeing wastewater is a general term for the wastewater generated in the above process links. In actual production, printing and dyeing wastewater has complex components, large fluctuations in water quality, difficult to degrade organic matter, and poor biodegradability. It is difficult for conventional treatment methods to make the secondary biological treatment effluent meet the discharge requirements. Therefore, it is necessary to develop advanced treatment on the basis of secondary treatment. Commonly used methods for sewage plant renovation. [0003] At present, an advanced treatment...

AI Technical Summary

Problems solved by technology

In the process of printing and dyeing wastewater treatment, with the increase of aeration time, the filler GAC is gradually adsorbed and saturated and the biofilm on the surface of GAC is continuously thickened. In order to ensure the efficient and stable operation of BAF, the filter needs to be backwashed to release the on the filter material. Intercepted suspended solids, increased biofilm activity, accelerated mass transfer process, etc. With the increase of backwash times, some packings will be seriously lost, and partial replacement of packings will be required, which will produce a large amount of waste granular activated carbon enriched in microorganisms and organic matter. serious waste of resources

At present, there is still little research on the treatment and disposal of waste fillers.

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