475results about How to "Short hydraulic retention time" patented technology

The invention provides an integrated internal circulation type denitrification and decarburization bio-membrane reactor and an operating method thereof. The main body of the reactor consists of an anoxic zone on the lower part, an aerobic zone on the upper part and a settling zone on the periphery of the aerobic zone; a composite filler is filled in the anoxic zone, and a water inlet pipe is communicated with the bottom of the anoxic zone; the aerobic zone is partitioned into a filler zone for adding a carrier on the upper part and a mud-water mixing zone on the lower part by adopting an orifice plate, the anoxic zone and the aerobic zone are partitioned through an impermeable partition plate, and a plurality of aeration pipes are arranged at the bottom of the aerobic zone and provided with air inlet pores; and the settling zone consists of three parts, namely a clean water zone, a contact settling zone and a sludge returning zone which are sequentially arranged from top to bottom, wherein the bottom of the sludge returning zone is provided with a sludge returning seam and communicated with the bottom of the aerobic zone. The reactor realizes zero power consumption in sludge returning, and is compact in structure; and a back flushing system is not required in the contact settling zone, and additional agents and carbon sources are not required, so that the reactor is low in running cost.

Disclosed is a technique for processing organic waste water, including the following steps: (a) preprocession: pour the waste water into the micro electrolytic reducing pool where the iron-carbon micro electrolytic reaction occurs under the agtatering effect, add hydrogen peroxide into it to have. Fento oxidation, then the water enters into coagulation pool into which add NaOH and PAM; (b) anaerobe hydrolysis oxidation procession: power the organic waste water preprocessed into high effective anaerobe hydrolysis oxidation pool in which add into the TCBS reactor in which add into high effective compound microbe, making the water mix with the flowing-back mud with high density after denitrification. The invention can increase the biochemical of organic waste water, strengthen its resistance to poison and impact as well as the biological denitrification funcation, and making the waste water reach the national environment protection requirement by reducing the polluting load by steps.

The active sludge-biomembrane compounding integral sewage treating method includes the first leading the sewage to be treated to the anoxic area through stirring for mixing sewage to be treated and active sludge, the subsequent leading the sewage to aerobic area with stuffing for aeration treatment with combined active sludge and biomembrane, and final leading the sewage to the precipitation area for natural deposition to separate sludge and water, leading out purified water, reflowing the mixed sludge liquid to the anoxic area and draining the residual sludge. The present invention also relates to the corresponding sewage treating apparatus. The present invention has the advantages of high treating capacity, resistance to impact load, simple operation, etc. and is especially suitable for use in medium and small towns.

The invention discloses a nitrosation-anaerobic ammonoxidation single-stage biological denitrification method, the technology utilizes nitrosation flora with intensified active carbon as core after adding powdery active carbon and anaerobic ammonoxidation flora to generate composite granule sludge, and couples two reactions of nitrosation reaction and anaerobic ammonoxidation reaction, realizes biological denitrification reaction for transforming ammonia nitrogen into nitrogen in macrography. The invention is operated in one reactor at normal temperature without need of heating preprocessing waste water, saves energy, needs small accommodation area and reduces free nitrous cumulant of free nitrite to resist ammonia nitrogen with higher concentration. The invention adds powdery active carbon to form intensified granule sludge and self-cultures suspended sludge, thereby simplifying startup and running of the technology.

The invention discloses a method for preparing a catalyst for treating high-concentration organic wastewater through catalytic oxidation, which comprises the following steps: 1) drying a cocoanut active charcoal at a temperature of between 100 and 120 DEG C for 8 to 15 hours, taking out and adding the cocoanut active charcoal into 2 to 10 percent sulfuric acid solution to perform soakage for 12 to 36 hours, adding the cocoanut active charcoal into a 1 to 10 percent oxydol solution to perform soakage for 12 to 36 hours, taking the cocoanut active charcoal out, and draying the cocoanut active charcoal in shade to obtain an activated charcoal for standby; and 2) soaking constant volume of the activated charcoal into transition metal salt solution for 12 to 36 hours, drying the activated charcoal at a temperature of between 100 and 120 DEG C for 8 to 15 hours, and calcining the activated charcoal at a temperature of between 300 and 650 DEG C for 3 to 8 hours to obtain the catalyst for treating the high-concentration organic wastewater through the catalytic oxidation. The service life of an active charcoal catalyst bed prepared by the method can reach over 0.5 to 1 year. After the treatment of the wastewater, compared with a Fenton reagent, the treatment efficiency of the catalyst is improved obviously, and the treatment cost is reduced by about 20 percent.

The invention discloses a reclaimed water treatment system combining an upflow aerating biological filter with horizontal underflow artificial wetland. The system consists of the upflow aerating biological filter and the horizontal underflow artificial wetland; the upflow aerating biological filter comprises a water inlet guide tube positioned at the bottom of the filter; a filter plate, a supporting layer, an A section filler area, a B section filler area and a water outlet area are sequentially arranged above the water inlet guide pipe; a communicating water pipe is mounted on the water outlet area, and communicated with a regulating tank of the horizontal underflow artificial wetland; an aerator pipe is led out of the supporting layer; the regulating tank and a matrix area parallel to the regulating tank are arranged at the lower layer of the horizontal underflow artificial wetland; the matrix area sequentially comprises a macadam area, a steel slag area, a zeolite area and a water outlet gravel area from left to right; the water outlet gravel area is equipped with a water outlet pipe; and a soil covering layer and aquatic plants are arranged at the upper layer of the horizontal underflow artificial wetland. With the adoption of the system, on-site treatment and utilization of sewage are achieved; the sewage treatment process flow is simplified; and operation and management costs are lowered.

The invention discloses a coupling filler autotrophic denitrification biofilter and application and belongs to the technical field of sewage treatment. Pyrrhotite, sulfur and a carbon source are utilized to be mixed and coupled according to certain proportion; then the materials are put into a reactor, and the autotrophic denitrification biofilter can be formed after inoculating biofilm formation;sewage flows through the biofilter, and nitrogen and phosphorus in the water are removed. The biofilter disclosed by the invention has the advantages of simpleness, easiness, practicability and shortbiofilm formation time; when the biofilter is utilized to treat nitrogen and phosphorus containing sewage, hydraulic retention time is only 0.5 to 3 h, and yielding water can meet a requirement; furthermore, the biofilter has the advantages of excellent nitrogen and phosphorus removal effect, low cost and suitability for engineering application.

The invention provides a garbage compression leachate comprehensive waste water treatment device and technological method. The device comprises a grille, a waste water storage tank, an ultrasonic Electro-Fenton reactor, an intermediate water storage tank, an ultrasonic vibration film reactor and a vortex vibration film filtration system, wherein the grille, the waste water storage tank, the ultrasonic Electro-Fenton reactor, the intermediate water storage tank, the ultrasonic vibration film reactor and the vortex vibration film filtration system are sequentially connected. The device further comprises a sludge dewatering drying pool which is connected with a vortex energy-saving heat pump flash evaporator of the vortex vibration film filtration system and provided with a circuit connected with the ultrasonic vibration film reactor. Waste water sequentially flows through the grille, the waste water storage tank, the ultrasonic Electro-Fenton reactor, the intermediate water storage tank, the ultrasonic vibration film reactor and the vortex vibration film filtration system for redox reactions and filtration. The device is high in operability, high in regeneration cycle use rate and low in operation cost.

An ecological method using artifical marshland system for controlling N-P pollution includes such steps as sequentially flowing the rain or sewage in sand deposition pool, in stage-one free-surface artificial marshland (staying for more than 1.5 hr), in zeolite undercurrent marshland containing zeolite and cinder (staying for more than 1 hr), and in stage-two free-surface artificial marshland (staying for more than 8 hr). Its advantage is high effect.

The invention belongs to the field of sewage treatment and provides a short distance denitrifying dephosphatation double-sludge technique taking granular sludge as medium and a device thereof. The device sequentially comprises a raw water pipe, a water inlet tank and a water inlet valve, and is characterized by further sequentially comprising an anaerobic/anoxic SBR reactor and an intermediate water tank which are connected with each other by a pipeline as well as a short distance nitration SBR reactor and a back flow water tank that are also connected with each other by the pipeline; wherein the intermediate water tank is connected with the short distance nitration SBR reactor, and the back flow water tank is connected with the anaerobic/anoxic SBR reactor; the anaerobic/anoxic SBR reactor and the short distance nitration SBR reactor are internally provided with stirring devices, and a drain pipe is arranged on the anaerobic/anoxic SBR reactor; the short distance nitration SBR reactor is internally provided with an aerating apparatus; the granular sludge which is processed by acclimatization and has the function of denitrifying dephosphatation is put into the anaerobic/anoxic SBR reactor, and the granular sludge which is processed by acclimatization and has the function of short distance nitration is put into the short distance nitration SBR reactor. The invention solves the problems of unstable effect of nitrogen and phosphorus removal of sewage, high content of effluent suspended matter and lower pass rate, so as to be used for low C/N waste water treatment.

The invention relates to a hydroxyapatite modified eggshell adsorbent material as well as a preparation method and an application thereof. The invention also provides a method for removing the hydroxyapatite modified eggshell adsorbent material and recycling phosphate from wastewater. The invention has the advantages that: the speed of removing phosphate from the wastewater of the hydroxyapatite modified eggshell serving as an adsorbent is obviously higher than the speed of removing phosphate from the wastewater by using eggshell only; through the phosphorous removing process taking the hydroxyapatite modified eggshell as the adsorbent, the hydraulic retention time of a reactor is shorter, and the construction and operation cost is lower; the eggshell and hydroxyapatite do not release harmful ions in the phosphorous removing process, thereby avoiding the risk of secondary pollution on the water and protecting the environment.

A method for treating wastewater in high-plateau and high-cold area, the wastewater and garbage leakage liquid being discharged through processes of physicochemical, biological and ecological steps. In the biological steps, carrier biological reaction device is employed, and by using immobilization technology of microporous biological carrier (WZT) and microorganism to improve the treating effect. In the ecological step, the artificial ecological wetland is employed. The method can treat wastewater especially wastewater in high-plateau and high-cold area with distinct effect because the critical technology of carrier biological reaction device and artificial ecological wetland can suit the climatic condition in high-plateau and high-cold area and it combines the physicochemical, biological and ecological steps organically, the wastewater treated can all reach the I class emission standard of country second category watershed.

The invention relates to one kind of wastewater treatment bioreactor. An aeration zone and a settle zone are provided in the reactor, the aeration device is located above the aeration zone, and a barrier and a gap are arranged between the aeration zone and the settle zone. It has many advantages: high oxidation rate in mixed liquid, high oxygen utilization rate of 40-50%, large volume load, short hydraulic retention time, run as activated sludge system, simple structure, low building cost, better solid-liquid separation effect, little surplus sludge produced, compact microorganism grains in mixed wastewater, and great settle capability. By comparison with other devices and technologies for wastewater treatment, the surplus sludge produced in degradation of 1 kg BOD declines by about 40 percent if the invention is used, which greatly reduces the amount of sludge for treatment.

The invention relates to a process for enhancing denitrogenation of a membrane bioreactor by anaerobic fermentation acid production. The process adopts an enhanced anaerobic tank, an anoxic tank and an aerobic tank. After entering the process, the sewage undergoes biochemical treatments including anaerobic fermentation, anaerobic denitrification and aerobic nitrification under the action of different kinds of microorganisms, and finally the effluent is sucked and collected by membrane filtration. By optimizing the growth environment of microorganisms in the anaerobic section, the process, on the one hand, promotes hydrolysis acidification of particle-stage organic matters (including colloid-state organic matters), slowly-degradable organic matters and hardly-degradable organic matters in the raw sewage, and on the other hand, produces acids from the excessive activated sludge which is discharged to the anaerobic tank to provide high-quality carbon sources for anaerobic denitrification. Besides, the process enhances the biological denitrification process by increasing sludge concentration, solves the problem of insufficient carbon source in biological denitrification process, and achieves the purpose of removing total nitrogen from the sewage with high efficiency by virtue of high-efficiency cut-off and separation characteristics of the membrane. The process can supplement carbon sources to the denitrification section for enhanced denitrogenation by fully utilizing converted carbon sources in the incoming water and carbon sources generated by sludge fermentation in the process without needing extra carbon sources. The process is simple and flexible in control, and the total nitrogen in the effluent can reach or exceed the first-class (A-class) discharge standard.

The invention relates to polluted air purification treatment technique field, which is an oil field wastewater treatment method. The steps of the method are firstly oxidation treatment then regular coagulation treatment. The method employs the synergic functions of ozone and ultrasonic to treat emulsion oil extraction wastewater, and then takes emulsion-breaking treatment to the oil, thus improving the coherence of pollutants and benefiting the subsequent coagulation treatment.

The invention provides an iron and steel complex comprehensive wastewater treatment device and process. The device comprises a coagulation unit, a biochemical treatment unit, a filter unit and an ozone catalytic oxidation unit. The biochemical treatment unit comprises a nitrification biofilter and a denitrification biofilter. The coagulation unit, the denitrification biofilter, the nitrification biofilter, the filter unit and the ozone catalytic oxidation unit are connected in order; or, the coagulation unit, the ozone catalytic oxidation unit, the denitrification biofilter, the nitrification biofilter and the filter unit are connected in order; or, the coagulation unit, the nitrification biofilter, the denitrification biofilter, the filter unit and the ozone catalytic oxidation unit are connected in order. The device can remove COD and ammonia nitrogen from wastewater synchronously at low cost, has the advantages of high treatment efficiency, good stability, strong impact resistance ability and simple operation, can flexibly selects the connection form of the treatment units according to the water quality condition, can realize the whole course flow by gravity, lowers energy consumption, and is conducive to project promotion.

The invention belongs to the technical field of environmental protection, and particularly relates to an efficient denitrification and dephosphorization process. The denitrification and dephosphorization process is provided with 7 biochemical treatment units including an anaerobic zone, a first anoxic zone, a first aerobic zone, a second anoxic zone, a second aerobic zone, a third anoxic zone and a third aerobic zone and the like, wherein sewage is mixed with sludge by the anaerobic zone, the mixture of the sewage and the sludge flows into the three anoxic zones in proportion, the sludge in a sedimentation tank flows back to the first anoxic zone, and a mixed solution at the tail end of the first anoxic zone flows back to the anaerobic zone. The denitrification and dephosphorization process can effectively remove the pollutants of organic pollutants, suspended solids, nitrogen, phosphorus and the like with low energy consumption in a short reaction residence time and ensure that the emission requirements are reached.

The invention discloses a process and device for sewage nitrogen and phosphorus removal integrating physical and biochemical filtration. The device is formed by a physical filtering tank, a hypoxia denitrification biological filter / an aerobic nitrification biological filter denitrification system, a phosphorus removal adsorption filtration reaction system and a PLC control system. Sewage enters the physical filtering tank, outflow water of the physical filtering tank can first enter the hypoxia denitrification biological filter / the aerobic nitrification biological filter denitrification system to be denitrified, and outflow water enters the phosphorus removal adsorption filtration reaction system to be dephosphorized thoroughly; or outflow water first enters the phosphorus removal adsorption filtration reaction system to be dephosphorized and then enters the hypoxia denitrification biological filter / the aerobic nitrification biological filter denitrification system to be denitrified; sewage having been denitrification and dephosphorized enters a clear water area and finally flows into a disinfecting tank, and the sewage is disinfected and discharged. According to the process and device, a phosphorus removal chemical does not need to be added, phosphorus in the sewage can be removed, the process is short, the investment cost is reduced, the operation cost is low, and sludge is treated easily.

The invention discloses a method for preparing a catalyst and a water treatment method for catalyzing ozone oxidization by utilizing the catalyst and relates to a method for preparing a catalyst and a water treatment method. The invention solves the problem that sludge left after sewage treatment occupies vast land and causes pollution to the environment. The method for preparing the catalyst comprises the following steps of: after drying, pulverizing and screening the sludge, charging the sludge into a zinc chloride aqueous solution; standing and removing supernatant liquor; and after insulating heat of particle sludge in a muffle furnace, rinsing respectively with hydrochloric acid and deionized water and drying to obtain the catalyst. The water treatment method comprises the following step of charging water treated by a flocculating pond, a settling pond and a filter pond or sewage treated by a settling pond I, a biological pond and a settling pond II into a reactor in which ozone and the catalyst are added, for treating. The invention provides the ozonization catalyzing catalyst with the characteristics of low cost, efficient catalysis, less dissolving amount and large specific surface area while the sludge problem is solved. The catalyst of the invention can improve the removal efficiency of ozone on organic pollutants in water.

The invention discloses a method for treating wastewater by utilizing an immobilized photosynthetic bacterium coupled film reaction system. According to the method disclosed by the invention, novel sulfonated SiO2/TiO2 mesoporous composite microspheres which are high in biocompatibility and photo-catalytic performance are taken as a substrate and an embedding method is adopted to prepare immobilized photosynthetic bacterium which is high in light utilization rate, high in degradation efficiency and resistant to wastewater load changes, so the transmission of photoelectrons inside the photosynthetic bacterium and between the photosynthetic bacterium and a carrier, and the degradation performance of the photosynthetic bacterium is remarkably improved; a novel film bio-reaction system is built by utilizing the efficient immobilized photosynthetic bacterium, the treatment effect on hardly-degradable printing and dyeing wastewater is effectively enhanced, the hydraulic retention time in an MBR system is shortened, the size of a biochemical pool is reduced, the operating cost is lowered, and the pollution of an MBR film is effectively alleviated.

The invention relates to a printing and dyeing wastewater pretreatment method based on an anoxic zone phase separation technology. According to the printing and dyeing wastewater pretreatment method, an anoxic zone is divided into a phase I and a phase II, namely a phase for hydrogen production and acid production through fermentation and a methanogenesis phase; an electron donor is provided by organic matters in the wastewater, and dye is effectively decolored in the phase I by using a sulfate reducing process and the reducing capacity of reduzate, namely the sulfide, therefore the biodegradability of the wastewater is improved; and the organic matters can be efficiently removed in the phase II. As an anoxic phase transformation technology in the printing and dyeing wastewater treatment course, the printing and dyeing wastewater pretreatment method is used for providing a two-phase anoxic system and carrying out pretreatment on the printing and dyeing wastewater; the chromaticity and the COD (Chemical Oxygen Demand) removal rates can be effectively increased, the biodegradability of the wastewater can be greatly improved, and the defects that a traditional anoxic process is instable in treatment effect, large in sludge yield and the like are overcome. The printing and dyeing wastewater pretreatment method can be used for effectively removing chromaticity and COD in the printing and dyeing wastewater, the removal rates of the chromaticity and the COD respectively reach more than 95 percent and 60 percent, and the organic loading to subsequent procedures is greatly reduced.