384 results about "Sludge bulking" patented technology

The invention provides municipal sludge expanded ceramsite and a preparation method thereof. The municipal sludge expanded ceramsite is prepared from the following materials by mass percentage: 20% to 45% of municipal sludge, 50% to 70% of shale, tailings or clay, 1% to 5% of organic matter and 1% to 5% of iron powder, wherein, the tailings is one of pyrite tailings, gold tailings, lead-zinc tailings and aluminum tailings; and the organic matter is sawdust. The preparation method comprises the following steps: feeding the shale, tailings or clay into a crusher, and carrying out the screening treatment; adding and mixing the municipal sludge, the organic matter and the iron powder, feeding into an ageing silo and stirring; then, feeding into a granulating machine, granulating and calcinating in a rotary kiln; and finally, cooling and stacking the calcinated ceramsite by classification. By using a great amount of municipal sludge, the invention is resource-saving and environment-friendly; compared with the original cost, the overall cost of a building is reduced by 5% to 10%; and the prepared expanded ceramsite has the advantages of light weight, fire resistance, sound absorption, good heat insulating and preserving performance, simple process and low cost, so that the invention is suitable for industrialized production.

The invention discloses a SBR alternant aerobic/anaerobic technology for biological denitrification and real time control device and method thereof which consists of, dividing the waste water to be treated into three portions, loading each portion into a reactor, alternatively carrying out the operating mode of aerobic aeration and anoxybiotic agitating under real time procedure control, so as to realize the organics degradation and nitrogen-containing compound removal.

The invention discloses a three-stage circulation aerobic reactor, which comprises a pond body, wherein the inside of the pond body is partitioned into a conical sewage expansion area, an aerobic reaction area, an anaerobic reaction area and a sediment filtering layer from bottom to top in sequence; the upper part of the aerobic reaction area is provided with a primary gas-solid-liquid separation area; the upper part of the anaerobic reaction area is provided with a secondary gas-solid-liquid separation area; three-phase separators are respectively arranged in the primary gas-solid-liquid separation area and the secondary gas-solid-liquid separation area; a water outlet weir is arranged above the sediment filtering layer; a water outlet pipe is arranged on the water outlet weir; the top of the pond body is provided with a double-stage circular reflowing system; the double-stage circular reflowing system comprises an air-lift pipe, a gas-liquid separating tank and a lower layer reflowing pipe; an upper layer reflowing pipe is arranged between the secondary gas-liquid separation area and the sediment filtering layer; and the upper layer reflowing pipe is connected with an aeration air inlet pipe arranged above the pond body. The reactor is provided with a three-stage circular reflowing system, and has the characteristics of rapid start of flocculent sludge, high impact load resistance, low requirement on the PH value of inflow water, high particle sludge increasing speed, low energy consumption, high treating efficiency and stable water yielding quality.

An aerobic biologic processing apparatus with automatic reflux of sludge by integrating different water flow forms in it has a pool body with water inlet and outlet at its both ends. Said pool body is divided into a flow guiding area with guide plate and partition, an aerating area with aerator on its bottom, and a sludge depositing area with inward inclined plate, baffle plate and overflow dam.

The invention discloses a method for treating leather-making industrial wastewater, sequentially comprising the following steps of: filtering, homogenizing; air flotation sludge scraping; adding alkali and flocculant to obtain sedimentation; separating mud from water; regulating pH value back; carrying out anoxic biochemical treatment and aerobic treatment; and delivering wastewater into a membrane biological reaction tank. The membrane biological reactor is filled with cultivated activated sludge and provided with a hollow fiber membrane assembly, and water is pumped out by a dump pump afterfiltered by the membrane assembly. In the method, the hollow fiber membrane assembly is adopted to replace a secondary sedimentation tank in the traditional technique and reduce the occupied area of the treatment system; meanwhile, the problem of sludge expansion in the traditional suspension activated sludge process is solved; the quality of outflow water is stable and reliable; and the operation is relative simple and convenient.

The invention discloses an anaerobic built-in zero-valent iron reactor, which belongs to the technical field of water treatment. The reactor is provided with two to six zero-valent iron packing layers between a water distributor and a biofilter material layer to form a suspended sludge area positioned between the biofilter material layer and the zero-valent iron packing layers and a sludge expansion area positioned between the zero-valent iron packing layers and the water distributor. The suspended sludge area is connected to a water inlet pipeline on the lower part of an anaerobic reactor through a circulating pipeline and a circulating pump. The outside of the anaerobic reactor is provided with a set of hydraulic circulating pipelines to improve the water flow velocity in a carrier sludge layer and the suspended sludge area so as to improve the decomposition rate of anaerobic bacteria on organic substances; the reactor has a reasonable structure and good working performance, can limit the expansion and floating loss of a bottom sludge layer, can improve the degradation capability on the organic substances, achieve high removal rate of the organic substances, and realize the quick startup of sewage at the same time; and late experiments show that the reactor can realize the successful startup of chemical saline wastewater within 43 days and keeps steady operation at subsequent stages.

A bioreactor for treating sewage has a concentric structure, which is composed of the internal anaerobic region consisting of water inlet tube, water distributor, anaerobic reactor, three-phase separator, reflux unit and depositing area, and the external aerobic region comprising water distributor, air distributor, up-flow area, dow-flow area and deposit separating area. Its advantages are less possessed ground and high effect.

The invention provides an apparatus for stably maintaining sludge micro-bulking for saving energy in biological denitrification technique, which is provided with a water inlet tank, a reactor, and a secondary sedimentation tank sequentially, the water inlet end of the reactor is provided with an anaerobic cellular chamber, the anoxia cellular chamber is provided with a stirrer inside, an aerobic cellular chamber or a passage is arranged behind the anoxia cellular chamber, the aerobic lattice chamber or the passage is provided with a dissolved oxygen probe and an aeration head, and each dissolved oxygen probe is connected to a PID control system, each aeration head is connected to an air compressor through an air-flow meter, each control switch is connected to the PID control system. By adopting reasonable regulating technology operation parameters, particularly, the technology is controlled to be carried out under the conditions of proper sludge burden and dissolved oxygen concentration, the invention improves inter-species balance between filamentous fungi and zoogloea bacterium, and controls the sludge bulking within a certain extent and avoids malignant sludge bulking, thereby stably maintaining sludge micro-bulking. The invention solves the technical problem of how to stably maintain sludge micro-bulking in sewage treatment, and saves aeration energy consumption and achieves sewage water high-efficiency treatment purpose while ensuring the process effect.

The invention discloses an effluent disposing method through fluid bed and making method of biological affinity fill, which comprises the following steps: filling biological affinity fill in the fluid bed; making predisposed effluent into anaerobic pulse fluid bed and aerobic circulating fluid bed to do biochemical disposal; separating water from mud through two sediment pond or gas floating technique; sterilizing; discharging sludge into sludge condensing pond or refluxing sludge to anaerobic pond and aerobic pond. The biological affinity fill is composed of polyurethane, rare earth and ferric oxide.

The invention provides a method for synthesizing polyhydroxy alkanoates by excess sludge in water treatment, which takes into consideration of technological features of high-concentration organic acid waste water treatment, microorganism synthesis PHA treatment and sewage plant remaining sludge treatment, realizes high-concentration organic-acid-containing waste water treatment and reduces remaining sludge output. The method comprises the following steps: inoculating active sludge, restoring active sludge and biological selection phase; acclimatizing and accumulating PHA; discharging a batch of PHA-rich active sludge for extracting PHA. The leading characteristic of the method is simple and rapid, acclimatization process for each batch of inoculated sludge lasts no more than 15-30 days; the equipment is simple and the method can be realized by a single SBR reactor; in addition acclimatization process and accumulation process are synchronous; as for urban sewage plant secondary sludge, normal PHA content accounts for more than 30% of dry cell weight; furthermore, operation stability is good and an anaerobic selection process section is provided for ensuring stability of the reactor, so as to inhibit propagation of filamentous fungus to prevent sludge from bulking and collapsing.

The invention discloses a real-time control method for denitrification by an enhanced circulating activated sludge method, which belongs to the field of biological denitrification of sewage and is suitable for advanced treatment of urban sewage. The effect of circulating activated sludge method on nitrogen and phosphorus removal is not ideal. The steps of the present invention: open the agitator in the main reaction zone at the same time as entering the water, and carry out the denitrification process under the anoxic condition, and stop stirring when a maximum value appears on the pH value curve and an inflection point appears on the ORP curve; Oxygen is supplied to the mixed solution to degrade organic matter and nitrify nitrogenous compounds, and stop aeration when a minimum value appears on the pH curve; repeat the above steps until the end of the water inflow stage, and react with the aerobic aeration stage end of period. The following process is similar to the traditional CAST method. It enters the sedimentation, drainage, and idle stages in turn, repeating all steps in turn and discharging sludge regularly. The whole process is completed by a real-time control system, which is easy to operate, low in cost, strong in impact load resistance, and not prone to sludge bulking.

A method and an apparatus for wastewater treatment using a nitrogen/phosphorus removal process combined with a floatation separation of sludge that is replaced by the gravity settling secondary clarifier are provided for effectively removing organic substances, nitrogen, phosphorus, granular substances and the like from wastewater. Al or Fe electrode plate is used for generating the micro bubbles so that phosphorus is removed by Al or Fe ions dissolved from the anode. With the method and the apparatus, a concentration of the microorganisms in the bioreactor is maintained high so that the volume and area of the reactor are reduced, that removal efficiency for organic substances, nitrogen, phosphorus is increased, that deterioration of settlability due to sludge bulking or micro floc and deterioration of out-flowing water quality are prevented, that the time required for settling is reduced to increase the processing quantity of wastewater, and that removal efficiency for phosphorus is maximized by simultaneous performances of biological phosphorus removal and chemical phosphorus removal by chemical agglomeration in the solid-liquid floatation separation vessel.

The invention belongs to the technical field of environment protection, and in particular discloses a sewage treatment method which specifically comprises the steps of inputting sewage into a mechanical grid, feeding the sewage passing through the mechanical grid into a regulating reservoir, further inputting the sewage in the regulating reservoir into a sewage cooling tower, inputting the sewage which is cooled by the cooling tower into a coagulative precipitation tank, feeding the sewage subjected to coagulative precipitation into a CASS (Cyclic Activated Sludge System) tank, and passing the sewage which is treated by the CASS tank through a biofilter so as to finally obtain treated water. The sewage treatment method has the advantages that the sewage treatment method is high in impact load adaptive capacity, not easy to have sludge bulking, small in floor space and simple and convenient to manage.

The invention discloses an effluent treatment control system and on-line control method of A/O craft short distance nitrated and antinitrated, which is characterized by the following: the domestic sewage is used as dealing object at normal temperature; the DO sensor and pH sensor are installed in aerobic pool; the ORP sensor is set up in anoxic tank; the internal recycle sensor controls inner loop reflux quantity of system dynamically; the aeration quantity controls the aeration quantity of kinetic control system; the aeration quantity and inner loop reflux quantity are changed limberly according to water quality of inflow and water outlet; the level or nitration and anti-nitration are held accurately. The invention simplifies the craft, which reduces the cost.

The invention relates to an anaerobic-anoxic oxidation ditch technique denitrification dephosphorization device and a method thereof, and pertains to the technical field of sewage treatment. Directed against the problem that the present oxidation ditch technique has unsatisfactory biological dephosphorization effect, the invention improves the traditional oxidation ditches so as to strengthen the dephosphorization capacity. Based on the traditional oxidation ditch treatment devices, an anaerobic tank and an anoxic tank A and an anoxic tank B are additionally provided, and a novel oxidation ditch technique that has the capability of denitrification and dephosphorization is developed. Characteristics and differences of phosphorus-accumulating bacteria, denitrifying bacteria and denitrification phosphorus removal bacteria are fully utilized so as to lead microorganisms of three kinds to occupy different ecological niches in three different selectors in one system, thereby realizing different functions respectively. By distributing reflux sludge and feeding water in a reasonable way, the invention relieves conflict between the phosphorus-accumulating bacteria and the denitrifying bacteria, and the competitive edge of the denitrifying bacteria is enhanced during competition, thus realizing high efficiency of denitrification and dephosphorization. The invention has the advantages of high dephosphorization efficiency, relatively stable operation, sludge bulking resistance, etc.

The invention provides an internal-mixing anaerobic reaction tank. A tank body is of a column shape, and a cone-shaped sludge bulking region, a reaction region, a gas-solid-liquid separation region and a precipitation separation effluent region are sequentially arranged in the tank body from bottom to top; and the cone-shaped sludge bulking region is a cone-shaped cover, an effluent weir is arranged above the precipitation separation effluent region, an automatic return-flow system is arranged at the top of the tank body and comprises an air lifting pipe, an air-water separation tank and a return pipe, the air lifting pipe is connected with the cone-shaped sludge bulking region and the air-water separation tank, the return pipe stretches into the lower part of the reaction region, a sewage gas pipe is connected between the air-water separation tank and the gas-solid-liquid separation region, and a sewage gas circulating pipe is connected between the air-water separation tank and a water distribution pipe. The internal-mixing anaerobic reaction tank has the advantages that the tank body is low in height, the tank can be started quickly by flocculent sludge with high shock load resistance, the requirement on a Ph value of inflow water is low, granule sludge increases quickly, the processing energy consumption is low, the processing efficiency is high, the effluent quality is stable, and the tank is suitable for processing of organic pollutants in various concentrations, simple to operate and convenience to run.

The invention relates to a method and device for realizing the lasting and stable accumulation of nitrite nitrogen under a low-temperature condition. The lasting and stable accumulation of the nitrite nitrogen is completed in two stages of biological aerated filter systems. The method comprises the following steps: step a. starting a first-stage biological aerated filter and a secondary-stage biological aerated filter, cleaning a filter material, soaking, forming a biofilm, commissioning and operating; b. preparing testing wastewater, and maintaining water temperature at 6 to 10 DEG C; c. enabling wastewater to flow out from a head tank and enter the first-stage biological aerated filter from below; and d. enabling yielding water of the first-stage biological aerated filter to enter the secondary-stage biological aerated filter from bottom to top in the same way. The nitration types of the two stages of biological aerated filter are nitrous acid-type nitration, the stable accumulation of NO2--N in the yielding water is shown, the accumulation rate is 63.2% to 79.8%, and the accumulation time is up to 30 to 35 days. The method has the advantages that the biofilm process adopting the two stages of biological aerated filters can be used for solving the problems of high energy consumption at a high temperature (30 to 40 DEG C), and sludge bulking under a low DO (Dissolved Oxygen) condition, and the effective removal of organic matters in wastewater with a low C/N ratio (less than 3) and the lasting and stable accumulation of NO2--N are realized.

The invention relates to a multi-stage air stripping and separation integrated aerobic granular sludge reactor which comprises a pond body and a gas-liquid separation tank, wherein the pond body is provided with at least two sludge bulking air stripping areas at intervals from bottom to top, and other sludge bulking air stripping areas except for the undermost sludge bulking air stripping area are all internally provided with aerators; a precipitation area and an effluent weir are arranged at the upper part inside the pond body, and a water distributing pipe and a mud discharge pipe are arranged at the bottom of the pond body; the pond body is internally provided with an air stripping pipe and reflux pipe; the upper end of the air stripping pipe is extended into the gas-liquid separation tank and is connected with the liquid inlet of the gas-liquid separation tank, the lower end of the air stripping pipe is extended into the undermost sludge bulking air stripping area, and the air stripping pipe is provided with liquid extraction ports in all sludge bulking air stripping areas; the reflux pipe is connected between the gas-liquid separation tank and the undermost sludge bulking air stripping area. The device disclosed by the invention is provided with multi-stage gas-liquid air stripping circulation and gas-solid-liquid separation, can be used for realizing the integration of multi-stage air stripping and separation, is fast in gas-liquid circulation and high in mass transfer efficiency and can be used for fast generating the aerobic granular sludge in an operating process.

The invention relates to a method for starting and stably keeping the micro-expansion of sludge in a synchronous biological nitrogen and phosphorus removal system, belonging to the field of treating sewage biochemically. A device for implementing the method is formed by connecting a water inlet pool, anaerobic cells, hypoxic cells, aerobic cells and a secondary settling pool in sequence. The wall of the secondary settling pool is provided with a sludge height mark so that the degree of expansion of the sludge can be known in real time. Each aerobic cell is provided with an independent dissolved-oxygen probe, and the dissolved-oxygen probe is connected with a dissolved-oxygen instrument. The control platform of a PLC (programmable logic controller) is used for controlling the concentration of the dissolved oxygen in each aerobic cell accurately according to the parameter set value and the feedback signal of the dissolved-oxygen instrument. The micro-expansion of the sludge in the synchronous biological nitrogen and phosphorus removal system is started by reducing the concentration of the dissolved oxygen in each aerobic cell to 0.8-1.0 mg/L, and the dissolved oxygen is regulated according to monitoring result of the SVI (sludge volume index), the height of the sludge in the secondary settling pool, the quality of the effluent of the device and other parameters so as to keep the micro-expansion of the sludge stable. Due to the adoption of the method, the pollutant removal rate is improved, the quality of the effluent is guaranteed, the aeration energy consumption of the water plant is reduced, and the energy-efficient treatment of the effluent is realized.

The invention discloses mixed municipal sewage and fecal sewage A2/O-biomembrane nitrogen and phosphorus synchronous removing device and method thereof. In the device, a second aerobic tank is connected with an anoxic tank through a pipeline and a mixed-liquid reflux pump; a sedimentation tank is connected with an anaerobic tank through a pipeline and a sludge reflux pump; and suspended filling materials are dispersed into a first aerobic tank and the second aerobic tank and are three-dimensional hollow light porous porcelain granules. By filling the suspended filling materials into an aeration tank of the traditional AAO (Anaerobic, Anoxic and Oxic) technology, carriers of an attaching and growing surface of microorganism are provided, biomass in the aeration tank is increased, processing ability of waste water is improved and sewage bulking is overcome, and attached phases and suspended phases simultaneously exist in the aeration tank to sufficiently exert superiority. On the premise that the volume of a reactor is not increased, the invention intensifies a nitration generating condition, improves the function of removing nitrogen and phosphorus of the traditional active sludge method technology, solves the problem of sludge age contradiction of the traditional AAO technology in a nitrogen and phosphorus removing process and has good water processing effect.

The invention relates to the technical field of sewage treatment in environmental engineering, and in particular relates to a process for recycling and processing hyperhaline reverse osmosis concentrated water generated in a sewage regeneration process. The process comprises the following steps of: carrying out photo-catalytic oxidation treatment: carrying out photo-catalytic oxidation reaction on the hyperhaline reverse osmosis concentrated water; carrying out biochemical reaction treatment: carrying out biochemical reaction on output water after the photo-catalytic oxidation reaction; and carrying out desalination treatment and ultra-filter purification treatment. The process disclosed by the invention has the benefits that the process has high eliminating efficiency on pollutants; reutilization of the hyperhaline reverse osmosis concentrated water can be realized; the process can be applied to processing other hyperhaline waste water with low concentration of organic matters and difficult to be subjected to biochemical treatment; the problems, such as sludge bulking and sludge floatation, easily appear in the active sludge method process, can be overcome; and the process has the characteristics of being steady for operation, strong in impact load resistant capability and economical and energy-saving, has a certain nitration and denitrification function, and is capable of being operated in a closed manner, preventing odour and the like.

An anaerobic reactor for treating sewage is divided into upper three-phase separation region and lower sludge expanding region, and is composed of base, cylindrical casing on base, water distributor connected between water inlet pump and circulating pump, three-phase separator, slant depositor, and control valves.

The invention relates to a sequencing-batch real-time control sewage treatment device which mainly comprises a water inlet pump, a biological selection pool, a sequencing-batch sewage treatment pool, a chemical adding device, a dosing pump, a water decanter, an air blower, a sludge concentration meter, an ultrasonic liquid level meter, a pH meter, a DO (dissolved oxygen) meter, an ORP (oxidation-reduction potential) meter, an ammonia nitrogen online monitoring instrument, a DA/AD data converter, a PLC control cabinet, and a remote control computer, wherein the water inlet pump is sequentially connected with the biological selection pool and the sequencing-batch sewage treatment pool; and the sludge concentration meter and the ultrasonic liquid level meter are arranged in the sequencing-batch sewage treatment pool, the pH meter, the DO meter, the ORP meter and the ammonia nitrogen online monitoring instrument are arranged on the side wall of the sequencing-batch sewage treatment pool, and all the devices are connected with the DA/AD data converter by cables, and the PLC control cabinet is connected with the remote control computer via an Ethernet. The reaction completion time is judged according to the feature points of instrument detection data, and sludge bulking and electric energy dissipation caused by insufficient aeration or overlong aeration time are effectively prevented by using real-time control.

The invention provides a device and a method for starting micro expansion of sludge in the anoxic/aerobic biological denitrification process, and belongs to the technical field of sewage treatment. The method is characterized in that in an anoxic/aerobic biological denitrification system, the micro expansion of the sludge is started, the micro expansion of the sludge is controlled within a certain limit, treatment effects are optimized and energy consumption is saved. The proposal of starting the micro expansion of the sludge in the anoxic/aerobic biological denitrification system comprises: 1, triggering the micro expansion of the sludge only by low dissolved oxygen, and including two starting modes for gradually lowering the dissolved oxygen concentration and suddenly lowering the dissolved oxygen concentration; and 2, starting the micro expansion of the sludge in the mode of the low dissolved oxygen combined with the low load. The device and the method are mainly used to optimize operational effects of the anoxic/aerobic biological denitrification sewage treatment system, namely under the conditions of lowering the dissolved oxygen concentration, saving aeration rate and saving energy, the pollutant-removing rate is ensured to meet the standards, and simultaneously the concentration of effluent suspended matters is greatly reduced.

The invention discloses an upflow blanket filter (UBF) anaerobic reactor with a filter layer on the top and for treating chemical wastewater. The UBF anaerobic reactor comprises a reactor, a water distribution device, a sludge expanded bed, a three-phase separator, an effluent collecting device and a methane circulating device and is characterized in that the three-phase separator is arranged in the middle of the reactor; the sludge expanded bed is arranged at the lower part of the three-phase separator; a biological filling region is arranged at the upper part of the three-phase separator; the biological filling region comprises filling and a biological membrane; and the biological membrane is formed by attaching anaerobic microorganisms to the surface of the filling. The UBF anaerobic reactor is suitable for treating the chemical wastewater which has high salt content and low suspended matter content and is difficult to degrade; and gas lift internal circulation is adopted, namely methane generated in the reactor is collected by the three-phase separator and internal circulation is realized by using the methane as the lifting powder and without external mechanical power.