Method of purification of biologically treated wastewater

 

(57) Abstract:

Use: treatment of biologically treated wastewater and can be used for deep purification of water from organic and suspended solids. The inventive purification carried out by filtration through granular loading and subsequent regeneration, and after filtration of wastewater treated immobilized on the carrier by microorganisms in multiple bioreactor with forced aeration in each section. The method improves the efficiency of treatment by increasing the duration of the working cycle without regeneration and reduce costs for the implementation of the method. 1 C.p. f-crystals, 2 tab.

The invention relates to methods of tertiary treatment of biologically treated wastewater dryer incl. air filters and can be used for deep purification of water from organic and suspended solids.

The known method of purification BOW by filtration through granular load [1] However, this method does not allow to remove colloidal and dissolved organic pollution.

The objective of the invention increase the duration of the working cycle without regeneration of the sorbent while maintaining a high degree of purification and the military method of purification of biologically treated wastewater, includes filtration through a sulfur loading and subsequent regeneration, after filtration of wastewater treated immobilized on the carrier by the microorganisms of the activated sludge in multiple bioreactor with forced aeration in each section, then sinks to increase the duty cycle of the bioreactor is additionally filtered through a sulfur loading.

According to the proposed method of treatment BOW to implement the immobilization of microorganisms on the media, located in every section of the bioreactor, it is not necessary to make the seed and carry out any preliminary preparation of the activated sludge microorganisms. Just turn on the water supply to the inlet to the bioreactor and bring the process to a flow-through mode, because the microorganisms of the activated sludge biological treatment facilities of any enterprise is already adapted to the pollution of this production and, in addition, activated sludge contains high concentrations of microorganisms-destructors.

Immobilized on the carriers of the microorganisms carry out destruction and oxidation of dissolved organic contaminants contained in the biologically about the major change of cultures from section to section, provides a high degree of dissolved organic compounds and decomposition products. In addition, due to immobilization in the bioreactor is a decrease in the concentration of suspended solids in the treated water.

Submission of technical air from the common duct separately in each section allows you to adjust and maintain the concentration of dissolved oxygen required for microbial life. It should not be less than 2 mg/l in each section. This method of aeration also allows you to carry out the necessary operations for each individual partition, not preventing leakage of the process in the other sections.

Additional filtration through a sulfur loading in the claimed method is used in two cases:

1) for the detention of suspended solids in a concentration of 20 mg/l, which is formed by partial separation from media waste biomass of activated sludge at a continuous bioreactor operation (> 1440) and the elongation thus the operating cycle of the bioreactor;

2) after the end of the regeneration process bioreactor for the detention of excess cells of waste activated sludge.

The process of purification BOW on predni high degree of purification (TSS 96-100% COD 80-87%), while well-known way to filter the second stage is 50-55 h, then require regeneration of the adsorbent (activated charcoal) is a complex and expensive operation.

When the movement of wastewater through the sulfur loading of polarization of the external surface of the granules of sulfur, which in turn changes the Zeta potential of the surface membrane of microorganisms. In addition, in contact with elemental sulfur is the activation of Exo - and endohelminth systems of bacteria that despite the shift of the surface-cell potential contributes to the intensification of metabolic reactions, including those through which oxidizes organics wastewater. Therefore, a preliminary filtering BOW through sulfur loading increases the efficiency of the biochemical stage of purification compared with the results obtained during the filtration BOSV other downloads without it.

The method is as follows.

Biologically purified waste water is supplied from the intermediate tank to the filter with sulfuric download free from excess biomass of activated sludge, then water comes in multiple bioreactor where x compounds immobilized on the carriers of microorganisms.

Necessary for vital functions of microorganisms concentration of dissolved oxygen (less than 2 mg/l) supported by submission of technical air separately in each section of the total duct through the valve.

Regeneration of sulfuric download carried out as in the known method.

After prolonged use of the bioreactor observed the removal of a significant amount (> 20 mg/l) suspended due to partial detachment from media waste biomass of activated sludge, making the water unusable for technical needs. In this case, you need to stop bioreactor for regeneration. With the aim of lengthening the working cycle of the bioreactor after biochemical treatment perform additional filtering on sulfuric download. This additional time is limited by the duration of the work cycle of sulfuric download. At the end of a filtration cycle bioreactor and additional sulfur stop filter regeneration at the same time.

Regeneration media located in sections of the bioreactor, as follows: completely stops the flow of water and air in the apparatus. This creates anaerobic conditions, there is separation of excess cells C 24 h) and is delayed by an additional sulphur filter. After the release of the bioreactor mode the additional step of filtering the sulfur off.

Example 1. The purification was subjected BOW Orenburg gas processing plant (AGPS). Studies were performed on the pilot plant displacement of 100 l capacity 700 l/day.

The supply of biologically treated wastewater was obtained from the aeration tank bare AGPS on the filter with sulfuric download. Then the clarified water was supplied to the three bioreactor with evenly placed in each partition of the carrier of inert material, which is in flow regime occurs immobilization of microbial cells activated sludge. The air supply is carried out from the existing plant duct separately in each section. Using valves air flow in sections regulated so that the concentration of dissolved oxygen was not less than 2 mg/l

Studies have shown that the optimal duration of the working cycle of the bioreactor 60 days (1440 hours).

The quality control of wastewater was performed on suspended sediment concentration (SSC) with dissolved organic matter determined by the COD.

The results are shown in table. 1.

Example 2. The study was carried out analogously to example 1. However bioreactor exceed 1440 hours This led to the deterioration of the characteristics of wastewater and demanded connect additional stages of filtering to sulfuric boot after bioreactor.

The results are shown in table. 1. As can be seen from the table. 1, the proposed method in comparison with the prototype allows to increase the duration of the working cycle of the second stage in 25-30 times while maintaining a high degree of purification (BB 96-100% and COD 80-87%).

Pre-filtering BOW through sulfur loading increases the efficiency of the biochemical stage of purification compared with the results obtained during the filtration BOSV other downloads without it.

In table. 2 shows the comparative results of the effectiveness of the biochemical stage of purification after the preliminary filtering on various filter downloads without it. Research of process of purification BOW Orenburg gas processing plant was performed on the pilot plant with a capacity of 700 l/day. Baseline water quality in all cases: CC 40-130 mg/l; COD 80-110 mg 0/HP

Thus, the use of the invention allow blonay stage of purification, including the cost of activated carbon, as well as reagents and gas on its regeneration.

1. Method of purification of biologically treated wastewater, including filtration through a sulfur loading and subsequent regeneration, characterized in that, to improve the efficiency of the method by increasing the duration of the working cycle without regeneration and reduce costs for the implementation of the method, after filtration of wastewater treated immobilized on the carrier by microorganisms in multiple bioreactor with forced aeration in each section.

2. The method according to p. 1, characterized in that, to increase the length of the bioreactor, wastewater additionally filtered through a sulfur loading.

 

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