1258results about "Biological treatment regulation" patented technology

An apparatus using activated sludge for the removal of biological nutrients from a wastewater includes a bioreactor for containing a mixture of wastewater under treatment and activated sludge. The bioreactor is divided into a plurality of serially connected treatment zones and includes a wastewater inlet, a downstream aerobic zone and an upstream aerobic zone between the wastewater inlet and the downstream aerobic zone, the upstream and downstream aerobic zones being separated by an anoxic zone. A method for removal of nutrients from a wastewater includes providing a wastewater to an inlet of a serial, multi-zone, activated sludge bioreactor containing an activated sludge. The bioreactor has a downstream aerobic zone from which water is removed and an upstream aerobic zone between the wastewater inlet and the downstream aerobic zone, the upstream and downstream aerobic zones being separated by an anoxic zone.

An inter-zone aerobic to anoxic zone flow rate control system for single vessel multi-zone bioreactor plants for wastewater treatment is described herein. The system of the invention provides control of the relative treatment times of the mixed liquor in the horizontally disposed and adjacent aerobic and anoxic treatment zones of the bioreactor by providing one or more flow rate adjusting gates located between the aerobic and anoxic zones of the bioreactor. The opening of the gates is adjustable in accordance with sensed conditions in the treatment zones. An automated embodiment of the invention includes a programmable logic controller that provides control scripts for adjusting the opening of one or more flow control gates according to inputs from sensors and per programmed instructions. An automated and supervised embodiment of the invention includes a computer interfaced with a programmable automating controller. The computer provides status reports, commands to the programmable automating controller, storage and analysis of data, as well as a means of communicating to remote monitoring centers and networks.

A method for an anaerobic digester system is provided that employs a cumulative data base to better monitor and control the anaerobic process, as compared with conventional anaerobic digester systems. The method includes the storing and ensiling of a feedstock, preferably a biomass, to form a digester feed material, which then processed by a digester. The process evolves a biogas and forms a digested material. The process is monitored, to collect a plurality of digester data from all stages of the process. These individual points or elements of the data are telemetered to a cumulative data base for storage and eventual retrieval and the cumulative data base is mined to compile predictive, feed forward controls and construct feedstock correlations between the metabolic activity within the digesters and an analysis of the feedstocks into the digesters. The method further includes the production of a high quality plant growth media from the digested mash, and recovery of the biogas generated within the digester. The biogas is collected with the aid of a biogas recovery system. The biogas is predominantly methane, and the anaerobic digester system is preferably operated to maximize the quantity and quality of methane generated.

The invention relates to an aerobic wastewater digestion unit useful for degrading organic material dissolved or suspended in a wastewater stream. The wastewater is fed to a vessel, wherein it is circulated by a liquid conveyor between the vessel and a downwardly-directed tube. Expulsion of fluid from the tube into the lower portion of the vessel agitates the liquid in the vessel and disperses into the liquid air that has been entrained in the liquid in the tube. The digester can be operated using varying liquid levels, and is amenable to batch, semi-batch, and continuous operation. The digester is suitable for use in combination with other components of wastewater treatment systems, and can be included as a module in modular wastewater treatment systems.

The invention is directed to a wastewater treatment system having an anoxic biological treatment zone, an aerobic biological treatment zone and a separator. The concentration of oxygen in streams within the system is strategically managed for improved removal of nutrient from the wastewater. A source of biodegradable carbon may be introduced to reduce the concentration of oxygen within the system. An effective treatment time under anoxic or aerobic conditions may further be varied.

A method and system for wastewater treatment based on dissolved oxygen control by a fuzzy neural network, the method for wastewater treatment comprising the following steps: (1) measuring art inlet water flow rate, an ORP value in an anaerobic tank, a DO value in an aerobic tank, an inlet water COD value, and an actual outlet water COD value; (2) collecting the measured sample data and sending them via a computer to a COD fuzzy neural network predictive model, so as to establish an outlet water COD predicted value, (3) comparing the outlet COD predicted value with the outlet water COD set value, so as to obtain an error and an error change rate, and using them as two input variables to adjust a suitable dissolved oxygen concentration. Accordingly, the on-line prediction and real-time control of dissolved oxygen wastewater treatment are achieved. The accurate control of dissolved oxygen concentration by the present method for wastewater treatment can achieve a saving in energy consumption while ensuring stable running of the sewage treatment system, and the outlet water quality meets the national emission standards.

The invention is directed to a method an apparatus for treating wastewater. The wastewater treatment system includes an aeration system that cycles between biological multiple biological basins. The system also includes one or more membrane basins. A method of the invention includes controlling the introduction of air into each biological basin in response to one or more operating conditions.

The invention is directed to a wastewater treatment system having an anoxic biological treatment zone, an aerobic biological treatment zone and a separator. The concentration of oxygen in streams within the system is strategically managed for improved removal of nutrient from the wastewater. A source of biodegradable carbon may be introduced to reduce the concentration of oxygen within the system. An effective treatment time under anoxic or aerobic conditions may further be varied.

Systems and methods for reducing odors utilizes oxidation-reduction potential to characterize the quality of water or wastewater and control addition of a species thereto that reduces or inhibits biological sulfide generation. Oxidation-reduction potential is measured at a downstream station and, based on the measurement, a nitrate compound is added at an upstream station to promote inoffensive biological products instead of foul-smelling products.

The present invention relates to apparatus, methods, and applications for treating wastewater, and more particularly to biological processes for removing pollutants from wastewater. This invention further relates to apparatus and methods for growing microbes on-site at a wastewater treatment facility, and for economically inoculating sufficient microbes to solve various treatment problems rapidly

A bioreactor system having improved temperature control wherein heat is directly removed from the bioreactor liquid to maintain temperature balance in the bioreactor. The present invention also relates to a method for maintaining a desired temperature range of thermophilic and mesophilic bioreactors wherein ambient air is brought into direct contact with droplets of bioreactor liquid. Heat is transferred from the droplets of bioreactor liquid to the air, which is then evacuated from the bioreactor.

The invention belongs to the technical field of polluted ground water remediation, and particularly relates to a method and a system by using micro-namo bubbles to perform reinforcement in-situ remediation on polluted ground water. The method comprises the steps of: arranging a water injection well at the upper reaches of a region with ground water polluted by pollutants, and feeding micro-nano bubble water containing nutrient salts; leading the micro-nano bubble water to flow to the polluted region with the ground water, so as to decompose the pollutants or continuously compensate electron acceptors or electron donors for microorganisms and facilitate degradation and removal of organic pollutants; at the same time, arranging a water pumping well to pump water at lower reaches of the polluted region, so as to form a subsurface flow field; and using a monitoring well to monitor and analyze parameters in real time during the process of removing the organic pollutants, and adjusting the generating time and the aeration intensity of the micro-nano bubbles. According to the invention, the micro-nano bubbles are good in oxygen supply effect, long in lasting time and wide in influencing range, the method and the system provided by the invention can make up the shortages of common in-situ remediation technologies such as natural degradation, bioventing and the like and are low in cost and high in energy-saving efficiency, thereby being applicable in remediation for a field with a limit area and a high pollution load.

A wastewater treatment process uses enhanced primary treatment to remove suspended solids from raw wastewater. Primary sludge is treated in a fermenter. Primary effluent is treated by biological nutrient removal (BNR) to produce a treated effluent and waste activated sludge (WAS). The WAS is treated in an anaerobic digester, which also treats sludge from the fermenter. Anaerobic digestate is separated to provide a liquid effluent. The liquid effluent is stripped of phosphorous and returned to the BNR as a source of readily biodegradable carbon. Liquid in the fermenter may also be separated to provide a liquid rich in volatile fatty acids (VFAs). This liquid is returned to the BNR when additional VFAs are required.

The present invention relates to apparatus, methods, and applications for treating wastewater, and more particularly to biological processes for removing pollutants from wastewater. This invention further relates to apparatus and methods for growing microbes on-site at a wastewater treatment facility, and for economically inoculating sufficient microbes to solve various treatment problems rapidly.

The invention discloses a natural pyrrhotite biological filter and a method for synchronously removing nitrate nitrogen and phosphorus out of water by using the natural pyrrhotite biological filter, which belongs to the field of advanced wastewater treatment. The method comprises the following steps: (1) preparing and constructing biological filter fillers; (2) starting the biological filter; and (3) operating the biological filter. Pyrrhotite is used as an electron donor of sulfur autotrophic denitrification bacteria to reduce nitrate in the water to nitrogen so as to remove nitrate nitrogen out of the water; and the pyrrhotite and an oxidative product of the pyrrhotite remove phosphorus in such manners as adsorption and chemical precipitation so as to synchronously remove nitrate nitrogen and phosphorus out of the water. The biological filter disclosed by the invention is simple to construct, convenient to start, stable to operate, high in nitrogen and phosphorus removal efficiency and free of auxiliary materials, and the biological filter is applied to advanced wastewater treatment.

An installation and a method for removing dissolved biodegradable compounds as a biological treatment step up-stream of an equipment to be protected from biofouling being part of a ground water, surface water or tertiary wastewater treatment line, wherein said upstream biological treatment step is carried out in at least one packed bed bioreactor comprising a vessel or a tank filled with packing elements, characterized in that: iv) said packing elements of said packed bed show a void fraction of at least 70% and the flow velocity of water through said packed bed bioreactor is at least 20 m / h, so that said packed bed does not have a removal efficiency of suspended solids in water, if any, of more than 30%; v) said packing elements of said packed bed show a specific surface area of at least 750 m2 / m3; vi) said process does not require the use of any biocide or biostatic compound.

The present invention provides a system and method for treating wastewater in which the majority of solids and biological oxygen demand compounds are separated from the wastewater feed using a primary separation process, to produce a solids phase and a water phase. The solids phase is irradiated to reduce the level of pathogens such that it is safe to use as a soil substitute and / or additive so that the solids can thus be disposed of in an environmentally-friendly manner. In additional embodiments, the solids that have been disinfected by radiation are mixed with a suitable inert filler material to produce a soil substitute, fertilizer, compost, or other soil additive. The liquid phase is treated in a substantially smaller system than would be required for treating the full-strength wastewater that can include a suspended media biological regeneration reactor system. The liquid treatment system can include a high flux adsorbent material treatment system integrated with a low flux adsorbent material biological regeneration reactor.

A method of biologically treating wastewater with an integrated fixed film activated sludge process. The integrated fixed film activated sludge process includes biomass suspended in mixed liquor and biomass disposed on carriers. Under certain conditions the dissolved oxygen concentration in a reactor that includes the mixed liquor, biomass suspended in the mixed liquor, and the biomass on the carriers, biological treatment is performed primarily by the biomass in the mixed liquor. This is achieved by controlling or maintaining the dissolved oxygen concentration in the reactor at a relatively low concentration. When the biomass suspended in the mixed liquor is unable to adequately biologically treat the mixed liquor, the dissolved oxygen concentration in the reactor is controlled or maintained at a relatively high concentration. This enables biomass on the carriers to contribute more to the biological treatment of the mixed liquor than when the dissolved oxygen concentration was maintained relatively low.

A sewage treatment monitoring system is provided, which includes a sewage treatment system and a cloud monitoring platform. The sewage treatment system includes a plurality of sewage treatment units. A water level detector, an apparatus data detector and a water quality detector are disposed so as to monitor the water level data, the operation status data and the water quality data of the sewage treatment unit. The real time monitoring data are uploaded to a database of the cloud monitoring platform. The real time monitoring data are compared to the threshold value of water level, the exceptional conditions of the apparatus and the continuous water quality monitoring data stored in a wisdom database, so as to determine whether an abnormality occurs in the sewage treatment system. An abnormal message is sent to the operator to conduct the appropriate treatment or adjustment.

A sewage treatment control device, a method and a sewage treatment system, are disclosed. In one example, the sewage treatment control device includes measuring units having sensors for inspecting specific components in water, respectively; validity verification units connected to the measuring units to determine validities for measured component values, respectively; target value setting units connected to the validity verification units to set target values for the component values measured in the measuring units, respectively; a manual setting unit for setting a target value depending on a component value inputted by an operator; a signal selection unit for allowing either one of the respective target value setting units or the manual setting unit to be connected; a proportional-integral-derivative control unit for performing proportional, integral or derivative action for the target value inputted from the signal selection unit to convert the target value into a control signal; and a manipulation unit for manipulating a sewage treatment apparatus depending on the control signal converted in the proportional-integral-derivative control unit.

Systems and methods for reducing odors utilizes oxidation-reduction potential to characterize the quality of water or wastewater and control addition of a species thereto that reduces or inhibits biological sulfide generation. Oxidation-reduction potential is measured at a downstream station and, based on the measurement, a nitrate compound is added at an upstream station to promote inoffensive biological products instead of foul-smelling products.

In allusion to the characteristics that in a sewage treatment process, the effluent water quality cannot reach the standard, the energy consumption is relatively high and the like, the invention provides a multi-objective real-time optimization control method for the sewage treatment process, by which optimization control over concentrations of dissolved oxygen SO and nitrate nitrogen SNO are achieved in the sewage treatment process. According to the optimization control method, an established energy consumption model and an established effluent water quality model, which are based on radial basis functions, are used as optimized objective functions, the optimized objective functions are treated via a multi-objective particle swarm algorithm to obtain optimized set values of the dissolved oxygen SO and the nitrate nitrogen SNO, and tracking control is performed on the optimized set values of the dissolved oxygen SO and the nitrate nitrogen SNO through a fuzzy neural network. According to the optimization control method, the problem of multi-objective real-time optimization control over the sewage treatment process is solved, the energy consumption is reduced on the basis that the effluent water quality is ensured, and high-efficiency and stable operation of a sewage treatment plant is promoted.

Systems and methods for performing anaerobic digestion of biomaterials using a clarifier, a batch reactor, and / or a digester are disclosed. The clarifier performs pretreatment processing of biomaterial to improve anaerobic digestion. The batch reactor and / or the digester are coupled to the clarifier and are configured to digest the processed biomaterial. A control system for an anaerobic digestion process includes a flow control system, a temperature control system, and a totalization system. The flow control system controls the flow of biomaterial and the delivery of chemical agents to the biomaterial based on conductivity, temperature, pressure, and / or composition of the biomaterial. The temperature control system includes a heat source and heat exchangers that control the temperature of the biomaterial. The totalization system senses the volume of biomaterial in at least one stage of an anaerobic digestion process and a controller controls the flow control system based upon the sensed volume of biomaterial.

Method and apparatus for treating contaminants in water under anaerobic conditions is disclosed. The method includes adding to contaminated water a composition including an aqueous mixture of at least one carbohydrate and at least one alcohol and / or bacteriastat. The apparatus includes a source of growing nitrifying bacteria effective for treating contaminants under aerobic conditions, a source of growing bacteria effective for denitrification under anaerobic conditions, and a controller for introducing the growing bacteria in a predetermined amount over a predetermined period of time.

A system for treating wastewater comprises a source of activated sludge, a compressor for supplying pressurized air, at least one anaerobic reactor for anaerobically treating wastewater with the activated sludge, at least one aerobic reactor for aerobically treating wastewater with the activated sludge and pressurized air, a pressure control system for regulating pressure in the system, a discharge system for removing byproducts of the system, and a discharge system for removing treated wastewater and activated sludge from an anaerobic and an aerobic reactor, and a surge tank for holding removed wastewater and activated sludge and thereby further treating the wastewater.

A reactor and control method thereof to maximize nitrogen removal and minimize aeration requirement through control of transient anoxia and aerobic SRT, repression of NOB, and control of dynamic DO concentrations or aeration interval by keeping the reactor NH4 and NOx concentrations approximately equal has been proposed. Controls described in this invention maximizes the potential for TIN removal through nitrification, limited nitritation, nitritation, denitrification, limited denitritation, denitritation making use of 1) real time measurement of ammonia, nitrite, nitrate, 2) operational DO and the proper use of DO setpoints, and 3) proper implementation of transient anoxia within a wide range of reactor configurations and operating conditions.

The systems and methods may be used for treatment of water that contains contaminants. Water containing at least one of a nitrate, percholate, chromate, selenite, and a volatile organic chemical is combined with nutrients and then is processed in an anoxic-anaerobic bioreactor. The combined effluent may also be oxygenated by dosing with hydrogen peroxide or liquid oxygen. The combined effluent of the bioreactor is dosed with a particle conditioning agent. The combined effluent treated water of the bioreactor is then filtered in a biofilter to produce a treated effluent stream. The influent water and combined effluent of the anoxic-anaerobic bioreactor may also be dosed with hydrogen peroxide to control biomass content in the system.

The present invention describes a method of optimizing CO2 concentration to increase the specific growth rate of Anammox bacteria and methanogens in wastewater and sludge treatment, as well as novel systems and methods of treating wastewater and sludge. The specific growth rate or doubling time of the Anammox bacteria and methanogens were determined to be sensitive to dissolved CO2 concentration. Optimizing dissolved CO2 concentration increases the specific growth rate of the Anammox bacteria, which may be used as an alternative biological nitrogen removal process for the treatment of domestic wastewater. In the method and system of treating sludge, the CO2 stripper returns biogas with low CO2 concentration to the headspace of an anaerobic digester in order to lower the headspace CO2 concentration and therefore, the soluble CO2 concentration. The lower soluble CO2 concentration increases the specific growth rate of the methanogens for a more efficient anaerobic digestion process.

A wastewater treatment system is provided comprising a biological reactor having a separation subsystem, a suspension system and a membrane operating system. The separation subsystem is constructed and arranged to maintain adsorbent material in the biological reactor with a mixed liquor. The suspension system is positioned in the biological reactor and is constructed and arranged to maintain adsorbent material in suspension with mixed liquor. The membrane operating system is located downstream of the biological reactor and is constructed and arranged to receive treated mixed liquor from the biological reactor and discharge a membrane permeate. In addition, a wastewater treatment system is provided comprising a first biological reaction zone, a second biological reaction zone and a membrane operating system. The first biological reaction zone is constructed and arranged to receive and treat the wastewater. The second biological reaction zone includes a separation subsystem and is constructed and arranged to receive effluent from the first biological reaction zone. A suspension system for adsorbent material is provided in the second biological reaction zone. The membrane operating system is located downstream of the second biological reaction zone and is constructed and arranged to receive treated wastewater from the second biological reaction zone and discharge a membrane permeate.