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  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/lStudies 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/HPThus, 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.
FIELD: waste water treatment.
SUBSTANCE: method us intended for use in municipal economy, hydropower engineering, oil fields, and petroleum processing industry to reduce amounts of impurities discharged into fish-industry reservoirs. Method comprises creating, in open drainage channels, curtains with developed surfaces for immobilization of microorganisms, controlling amount of biomass secured on curtains in accordance with water-dissolved oxygen, establishing hydraulic-mode travel of water in open drainage channel ensuring optional utilization of the latter in the waste water treatment process. Biological treatment is accomplished by biocenosis attached to wire-brush curtains located in displaceable containers. Curtains are installed along the drainage channel with intervals allowing saturation of water with oxygen. Removal of excess biomass and deposits from wire brushes is accomplished by removing containers from the channel, placing them into water-filled tank, and regenerating were threads of brush by bubbling surrounding water, after which containers are reinstalled in the channel. Thickening of accumulated removed insoluble matters is achieved by circulation of polluted water from tanks through filter presses introducing intermediate flocculant treatment.
EFFECT: increased stability of post-treatment process and facilitated removal of accumulated deposits.
2 cl, 1 dwg
FIELD: sewage biological purification equipment.
SUBSTANCE: the invention is pertaining to installations of household and similar industrial sewage biological purification and may be used in a municipal economy and at industrial enterprises. Installation of sewage biological purification consists of: a tank divided by partitions into steps, sections, chambers of steps of bioreactors; systems for sewage feeding, distributing and withdrawing; a system of recirculation of sludge mixtures; a system of air supply; thin-layer pulsed silt master units, a filamentary nozzle for retaining of hydrocoles; communications for sewage settlings separation from the sewage biological purification installation. The tank is made three-staged with the different size steps. The second stage is twice as large as the first one, and the third stage by one third exceeds the first step. The first and the second steps are supplied with chambers of the thin-layer pulsed silt master units. The dimensions of a thin-layer pulsed silt master unit in the first step are in one and a half times less than the similar units in the second step. In essence the first step is made as an ideal mixer, and the second and the third steps - largely as displacers. The nozzle is located in the second and third steps. Communications for withdrawal of the sewage settlings beyond the limits of the installation are placed exclusively in the third step. The technical effect is an increase of efficiency of removal from the sewage of phosphorus and nitrogen, a multiple decrease of the specific volume of tanks, a decrease of power input and simplification of operation.
EFFECT: the invention ensures increased efficiency of removal from the sewage of phosphorus and nitrogen, a multiple decrease of the specific volume of tanks, decreased power input and simplification of operation.
FIELD: biological purification constructions for purifying of domestic and industrial water by means of active silt.
SUBSTANCE: system has aeration tank, primary and secondary settlers, pumping station adapted for supplying of silt mixture from aeration tank into primary settler, pipes for supplying of basic sewage water and purified water, silt mixture and return active silt, bypass pipe with locking-regulating fittings, and sediment removal apparatus mounted in primary settler and connected with aeration tank. Apparatus has partition wall equipped with bypass openings and adapted for dividing said apparatus into two equal parts. Bypass pipe is positioned for supplying of basic sewage water into aeration tank.
EFFECT: provision for standard quality of purified water and maintaining loading of silt at abrupt increase in volume of basic sewage, and increased capacity of purification constructions above design value.
1 dwg, 1 tbl
FIELD: waste water treatment.
SUBSTANCE: invention relates to biological waste water treatment methods that can be used at enterprises of power, petroleum processing, petrochemical, chemical, paper-and-pulp, food processing, and other industries as well as for treatment of household sewage. Biocatalytic waste water treatment is performed by oxidation in air tanks or on biofilters in presence of catalytically acting substance and activated sludge. In case of air tanks, catalytically acting substance consists of one (multifunctional) or three (one multifunctional and two selective) heterogeneous catalysts for oxidation of inorganic and/or organic compounds and containing active component: variable-valence metal oxides and/or hydroxides, or spinels, and, additionally, modifying additive, in particular organic bases and/or heteropolyacids, active component being deposited on polymer carrier (polyethylene or polypropylene). Content of active component is 15-20% and that of modifying additive 0.5-20%. For oxidation of organic, sulfur, and nitrogen compounds, multifunctional catalyst is used containing active component consisting of variable-valence metal oxides and hydroxides. For nitrification process (ammonium nitrogen oxidation), selective catalyst is used containing active component consisting of variable-valence metal spinels and oxides. In case of denitrification process (reducing nitrites and nitrates into molecular nitrogen), selective catalyst is used containing active component consisting of variable-valence metal spinels and hydroxides. Oxidation process is accomplished at catalyst-to-water ratio 1:75 at consumption of air not higher than 9.0 m3/m3. Invention also discloses biocatalytic treatment of waste waters via oxidation on biofilters in presence of activated sludge and catalytically acting substance consisting of active component (15-50%): one or several variable-valence metal compounds, flux (50-10%): silicon-containing compound, modifying additive (0.5-20%): carbon-containing material, and carrier: clay.
EFFECT: increased productivity and reduced power consumption on existing treatment plants, reduced investment and operational expenses, and deepened waste water treatment.
8 cl, 5 tbl, 10 ex
FIELD: cleaning of sewage water.
SUBSTANCE: invention relates to biochemical cleaning of sewage water and it can be used for local cleaning of sewage of enterprises, offices and dwelling houses. Proposed method of biochemical cleaning of sewage water includes treatment of sewage water in primary settler, saturation of water with oxygen from air and recirculation of active sludge in aeration tank and cleaning of water in secondary settler. Saturation of water with oxygen from air and recirculation of active sludge is done in aeration tank furnished with bioblocks by means of ejector installed in intake chamber. Preliminary cleaning of water from coarse mechanical impurities is carried out in sand trap with subsequent cleaning of sewage water in biofilter located after secondary settler and chlorine water meter.
EFFECT: improved cleaning, reduced volume of sediment formed in process of cleaning.
2 cl, 1 dwg
FIELD: methods of biological purification of sewage.
SUBSTANCE: the invention is pertaining to the methods of biological purification of sewage and may be used in a municipal services, in various industries to decrease volumes of the capacitive structures, volumes of produced sediments, to increase stability of production of the purified water of a high quality, to control operation of the sewage purification plant. The method provides for a sewage passing through the first silt system made with a possibility to use the heterotrophic bacteria fixed on the rigid barbed head made out of the polymeric brushes, working at an organic substances loading of 1.0 kg of BOD (biochemical oxygen demand) per one kg a day of the dry ashless silt. Then the water is passing through the second silt system, having a possibility to use the active silt free-floating in the thin-layer pulsating silt-separators at the average hourly pass of the consumed sewage in the rack space at Reynold's number of no more than 250. In the third silt system the tank is divided by septums into bays and in the first downstream sewage purification bay allocate a chamber supplied with a thin-layer silt separator for the regeneration waters of the third silt system and then excessive active silt of the second silt system, the weirs for withdrawal of the above silt waters into the first bay of the third silt system and a water-feeder launder for collection of the regeneration waters from all bays of the third silt system and an excessive active silt of the second silt systems into the chamber. The technical result is an increased stability of the sewage purification plant operation and production of the qualitatively purified water, regulation of the sewage purified plant operation.
EFFECT: the invention ensures an increased stability of the sewage purification plant operation and production of the qualitatively purified water, regulation of the sewage purified plant operation.
FIELD: devices for biological purification of sewage.
SUBSTANCE: the invention is pertaining to devices for biological purification of urban and similar by composition industrial sewage and may be used in a municipal services and at industrial enterprises. The first silt system of the bioreactor is based on usage of a fixed on the rigid barbed head bacterial cenosis of heterotrophic microorganisms in the bays of the ideal mixers with a number of the rigid barbed nailheads ensuring conformity of capabilities of the oxidizing power of the aerating system with the oxidizing power of the biomass of the adnate micro-organisms. Withdrawal of the excessive biomasses of the silts from the second and third silt systems is arranged due to a device located in the bay of the third silt system of the chamber partitioned by a solid vertical partition, and supplied with a thin-layered silt separator, a pipeline for removal of the dense silt for dehydration and a launder for withdrawal of the above the silt water to the inlet of the purified sewage in the first bay of the third silt system. The passage way of the bioreactor of the third silt system is divided by the solid vertical partitions into the chambers filled with containers with barbed nailhead supplied with the separately operating systems of bubblers of water aeration and regeneration checker-works. The technical result is an increased efficiency and stability of work of the first silt system with simultaneous simplification of its operation and a decreased consumption of materials, putting a discharge, silt separation and withdrawal of the above silt water in good order at withdrawal of the excessive sediments from the silt system.
EFFECT: the invention ensures an increased efficiency and stability of work of the first silt system with simultaneous simplification of its operation and a decreased consumption of materials.
2 cl, 2 dwg
FIELD: chemical industry; petrochemical industry; bio-engineering; methods of purification of the concentrated waste waters.
SUBSTANCE: the invention is pertaining to bio-engineering, in particular, to purification of the concentrated waste waters and may be used in chemical and petrochemical industries. The method of purification of the concentrated waste water containing aromatic hydrocarbons and their derivatives, peroxides and aldehydes, includes an aerobic treatment with strains of bacteria Pseudomonas sp. VCPV-3893 and Rhodococcus sp. VCLMV-3892. At that before the stage of the aerobic treatment carry out a preliminary purification of the waste waters by a consecutive stages of treatment of the waste waters with an alkaline solution up to the pH value of no less than 9.5. Then conduct the further distillation of the treated flow at the temperature of the bottom distillation residue of the column of no less than 98°C and the duration of presence of no less than 0.2 hour. At that the bottom distillation residue of the column is directed to the stage of the aerobic treatment and the upper product of the column is directed to utilization. The method allows to purify effectively the concentrated waste waters containing aromatic hydrocarbons and their derivatives, and also peroxides and aldehydes.
EFFECT: the invention ensures effective purification of the concentrated waste waters containing aromatic hydrocarbons, their derivatives, peroxides and aldehydes.
FIELD: biological purification of the waste waters; installations for biological purification of the waste waters.
SUBSTANCE: the invention is pertaining to the field of purification of the waste waters and, in particular, to biological purification of the small and middle volumes of the waste waters. The installation of the biological purification of the waste waters contains the housing, the waste waters receiving tank, the ejectors, the pump for ejection of the waste water, the pump for pumping out and ejection of the purified water, the biofilter, the spray jet and the sensors of parameters of the being purified medium. The sensors of the parameters of the purified water include the sensor of the volumetric concentration of the dissolved oxygen connected through the comparison unit containing the preset value and with the a control unit for the pump ejecting of the waste water. The biofilter contains the additional plates made out of the same material used in the biofilter itself; one the sides of each plate is rigidly linked with the biofilter and is arranged in parallel to the central axis of its housing. The technical result of the invention is the increased efficiency of operation of the installations for biological purification of the waste waters at a minimum level of power inputs due to activation of the biological vital functions of the micro-organisms.
EFFECT: the invention ensures the increased efficiency of operation of the installations for biological purification of the waste waters at a minimum level of power inputs.
2 cl, 4 dwg
FIELD: equipment for deep biological purification of domestic sewage water by means of suspended active silt, used in individual cottages and houses, as well as in hotel complexes, schools, sportive clubs, villages and public catering enterprises.
SUBSTANCE: method involves feeding sewage water into equalizing reservoir containing active silt, working water level sensor and maximum water level sensor; pumping out crude water from tubular filter of equalizing reservoir and directing it therefrom into settler, and from settler into chamber containing porous filter; pumping silt into silt stabilization chamber; feeding air into reservoirs and chambers; ceasing operation of apparatus and withdrawing completely purified water. Apparatus operates in two-phase mode of operation.
EFFECT: provision for producing high-quality sewage water fit for utilization in agriculture, reduced consumption of power, intensified purification process, enhanced reliability in operation of apparatus, reduced labor intensity for manufacture and operation of apparatus.
3 cl, 2 dwg