90 results about "Ph control" patented technology

The invention discloses an enhanced metal-based composite water purifying agent and a preparation method thereof, belongs to the technical field of preparation of water purifying agents, and aims to solve the technical problem that the flocculation capacity and the stability of a composite water purifying agent in the prior art need to be further improved. The preparation method specifically comprises the following steps: preparing a water purifying agent skeleton dispersion liquid by using chitosan and sodium alginate; chitosan-sodium alginate is used as a porous framework, a polyphenol-multi-metal complex is loaded, a structure is enhanced through Ca < 2 + > crosslinking, then SiO2 is used for coating to improve acid and alkali resistance and stability, and finally PAC is introduced to realize rapid flocculation. In the preparation process, the organic framework, the metal complex and the inorganic coating layer are fully compounded through pH control and step-by-step dropwise adding, and the obtained composite water purifying agent can efficiently remove phosphorus, chromium and suspended solids in water and shows a remarkable synergistic purification effect and storage stability.

The invention relates to a recyclable easily-degradable macromolecular surfactant for cleaning oily sludge and application of the recyclable easily-degradable macromolecular surfactant. The macromolecular surfactant is prepared by taking acrylamide, methacrylic acid long-chain alkyl ester and tertiary amino substituted methacrylate as raw materials through free radical polymerization. The macromolecular surfactant is dissolved in water to prepare a cleaning solution, and oily sludge can be efficiently eluted. CO2 and N2 are sequentially introduced into the oil-containing emulsion after the oil-containing sludge is cleaned, or diluted hydrochloric acid and a diluted alkali aqueous solution are sequentially added, the hydrophilic-hydrophobic property of the macromolecular surfactant is changed through pH regulation and control, separation of the macromolecular surfactant and an oil phase is achieved, petroleum resources are recycled, and recycling of the cleaning solution containing the macromolecular surfactant is achieved. The residual macromolecular surfactant in the cleaned deoiled sludge can be degraded under the action of environmental microorganisms.

The invention provides an efficient softening and hardness-removing process for a high-hardness water body, which is applied to the technical field of water body purification. The efficient softening and hardness-removing process comprises a pretreatment mechanism, a softening reaction mechanism, a flocculent precipitation mechanism and a sludge closed-loop treatment mechanism which are sequentially connected along a water body treatment flow direction, the efficient softening and hardness-removing process for the high-hardness water body comprises the following raw water treatment steps: S1, treating raw water by virtue of the pretreatment mechanism, so as to obtain ultrafiltration effluent; and S2, the ultrafiltration effluent enters the softening reaction mechanism, and under the control of the electric cabinet control mechanism, chemicals are added for softening and flocculation reaction. The total hardness removal rate can reach more than 90% through accurate addition of the medicament, two-stage pH control and optimization of reaction conditions, which is far superior to that of a traditional resin ion exchange method, the influence of high-hardness water discharge on receiving water is reduced, ecological and health problems caused by excessive hardness of the water are avoided, and the harsh requirements of industrial production and environmental protection on soft water are met.

This invention relates to the fields of bioengineering and fermentation engineering, and discloses a genetically engineered *Streptomyces albopictus* strain that produces high levels of ε-polylysine and its fermentation production process. This genetically engineered strain uses *Streptomyces albopictus* strains acclimated to ε-polylysine tolerance as a chassis, and its genome integrates... ppc and dapf Through expression box, heterogeneous asd Expression cassettes, containing secretory signal peptides lysp Fusion expression cassettes and D404A / K499A point mutations pls Expression cassette. The fermentation process employs a two-stage pH control strategy, maintaining a neutral environment during the cell growth phase and adjusting to an acidic environment during product synthesis. This invention improves ε-polylysine yield through a synergistic strategy of enhancing precursor supply, constructing efflux detoxification channels, and increasing synthase activity; combined with an acidic fermentation process, it effectively inhibits product degradation, yielding a high-molecular-weight and highly uniform target product suitable for industrial production.

The invention discloses an antimony and manganese removal water treatment system and method based on feedforward-feedback control, and belongs to the technical field of water treatment. When the antimony concentration of inflow water is abnormal, pH pre-adjustment is carried out through an acid adding device before coagulation, after the pH is precisely reduced to a target value, an iron salt coagulant is added, antimony is removed through coagulation and precipitation procedures, the pH is adjusted back through an alkali adding device before filtration, and it is ensured that the effluent water reaches the standard. And when the manganese concentration of the settled water exceeds the standard, synchronous removal of manganese is realized by utilizing the adsorption effect of specific filter sand in the filter tank. According to the method, the detection device and the control system are integrated, the feed-forward-feedback mechanism is used for optimizing pH regulation and control and agent adding in real time, the problems that in a traditional method, pH control is difficult, low-concentration antimony removal is unstable, the manganese adsorption capacity is limited and the like are effectively solved under the condition that a process unit does not need to be newly added, cooperative, efficient and stable removal of antimony and manganese is achieved, and the method is suitable for large-scale industrial production. And the discharged water continuously meets the limit value requirements of the Sanitary Standard for Drinking Water.

This application discloses a method and its application for preparing collagen peptides by stepwise enzymatic hydrolysis with dynamic pH control, belonging to the field of protein preparation technology. The method includes raw material pretreatment, stepwise enzymatic hydrolysis with dynamic pH control, and post-treatment to obtain collagen peptide products with a molecular weight distribution of 800-2000 Da. The obtained products can be used to prepare products with bone growth promotion functions. This application employs a combined process of stepwise enzymatic hydrolysis with dynamic pH control, alkali-thermal coupling pretreatment, and 2000 Da retention. The steps work synergistically: alkali-thermal treatment exposes enzyme cleavage sites, dynamic pH control enables efficient enzymatic hydrolysis, and 2000 Da retention of active components results in a significantly higher yield and content of collagen peptides compared to conventional processes. Animal experiments have demonstrated that the collagen peptides have bone growth promotion activity, and the mechanism of action has been revealed at the IGF-1 signaling pathway level.

The present invention relates to an eco-friendly soil conditioner and a method for manufacturing same and, more specifically, to: an eco-friendly soil conditioner which increases moisture retention ability in soil and, at the same time, enables soil aggregation, pH control, nutrient supply, incorporation of microorganisms, and the like, thereby being capable of creating optimal vegetation conditions and also increasing bio-carbon content through biodegradation, thus being able to reduce global warming; and a method for manufacturing same.

The invention belongs to the technical field of industrial automation control, and relates to a DCS automatic control system and method applied to a reaction kettle, and the system comprises a data collection module, an execution module, a human-computer interaction interface, and a control module. The control module is in communication connection with the data acquisition module, the execution module and the human-computer interaction interface so as to realize transmission of signal and data information, preset graded temperature control logic (multiple preset temperature control programs), pH control logic and seasonal mode selection logic are stored in the control module, and according to the deviation value of the measured temperature and the set temperature in the reaction kettle, the temperature of the reaction kettle is controlled to be adjusted. And the control module controls the execution module to execute actions to complete graded temperature control. According to the invention, the problems of low precision, slow response and single function of a traditional reaction kettle temperature control system are solved, intelligent and integrated cooperative control of multiple parameters such as temperature, pH, flow, liquid level and the like is realized, and the automation level, the product quality stability and the energy utilization efficiency of the production process are remarkably improved.

The invention provides a method and a system for accurately controlling the pH value of single-tank outlet light salt brine in multiple groups of electrolytic tanks, comprising multiple groups of electrolytic tanks, a tank inlet brine branch pipe is connected with a diluted hydrochloric acid branch pipe, the diluted hydrochloric acid branch pipe is provided with a diluted hydrochloric acid flowmeter and a diluted hydrochloric acid regulating valve, and the tank outlet light salt brine branch pipe is connected with a light salt brine sampling branch pipe. Each light salt brine sampling branch pipe is provided with a light salt brine sampling program control valve and a simulation assignment module, the light salt brine sampling branch pipes are connected with a light salt brine sampling header pipe, and the light salt brine sampling header pipe is provided with a sampling adjusting valve, a sampling flow meter and a pH meter; the diluted hydrochloric acid flow meter, the diluted hydrochloric acid adjusting valve, the light salt brine sampling program control valve, the sampling adjusting valve, the sampling flow meter and the pH meter are all connected into a DCS system, and the diluted hydrochloric acid adjusting valve adjusts the opening degree according to the detection value of the pH meter. Precise adjustment and control of pH of light salt brine discharged from each single cell in multiple groups of electrolytic cells are realized through a pH meter and a control loop thereof, the anode efficiency and the quality of a liquid caustic soda product are improved, and the production stability is improved.

The utility model relates to the technical field of wastewater treatment, in particular to a pH regulating and controlling device for beverage wastewater treatment, which comprises a treatment barrel, a stirring device, an acidity regulating device and an alkalinity regulating device, a solid pH sensor is mounted on the inner side wall of the treatment barrel, and a control system is mounted on the side wall of the front end of the treatment barrel. An acidity adjusting device is mounted at one end of the treatment barrel, an alkalinity adjusting device is mounted at the other end of the treatment barrel, the stirring device is mounted in the treatment barrel, and a stirring shaft drives stirring blades to rotate and stir, so that circulation of wastewater in the treatment barrel is promoted, and a regulator is prevented from settling; according to the invention, the solid pH sensor is arranged in the container, the liquid in the whole container is uniformly stirred, the regulator and the wastewater are efficiently mixed, in the whole treatment process, the solid pH sensor continuously monitors the pH value change of the wastewater, and the control system dynamically adjusts the input amount of the pH regulator according to real-time data until a preset target pH range is reached.

This invention discloses a selenium-enriched dairy product from selenium-enriched dairy cows and its preparation method, comprising the following components and process characteristics: Basic milk matrix: by mass percentage, containing 85-95% raw milk or reconstituted milk, 0.5-2% milk protein concentrate, and 0.1-0.5% fructooligosaccharides; Probiotic-polyphenol complex: composed of *Lactobacillus plantarum* LP-33 (preservation number CGMCC No. 24567) and grape seed polyphenols, wherein the polyphenols are compounded in a 1:1 ratio with zein-chitosan bilayer microencapsulated form in a free state, with a total addition amount of 50-100 mg / L; Dynamic pH control system: during fermentation, the pH value is monitored in real time and a 0.1-0.5 mol / L sodium bicarbonate buffer solution is automatically added to maintain the pH at 5.0-5.5. This invention achieves breakthroughs in viable count and acid resistance; through dynamic pH control and synergistic protection by polyphenols, the viable count of the finished product is ≥1×10⁻⁶. 9 With a CFU / mL concentration, the survival rate of probiotics in simulated gastric juice for 2 hours is >80%, solving the problem of "high output but low intake" of probiotics in traditional fermentation.

This invention relates to the field of inorganic fine chemical material preparation technology, and discloses a method for preparing high-purity ultrafine calcium fluoride based on dynamic pH-controlled gradient crystallization. The method uses industrial-grade calcium carbonate and fluorosilicic acid as raw materials. Its core is based on dynamic pH gradient control of the reaction mechanism, precisely dividing the calcium fluoride crystallization process into three stages: primary nucleation, secondary growth, and tertiary purification. Through the coordinated matching of parameters such as pH, temperature, and stirring rate at each stage, complete separation and control of nucleation and growth are achieved, ultimately producing high-purity ultrafine calcium fluoride powder with a purity ≥99.9% and a particle size of 1–5 μm. This invention features low raw material costs, strong process controllability, and the main byproducts are CO2 and silicic acid, both of which can be recycled. No fluoride-containing wastewater is discharged during the process, achieving clean production. Furthermore, the process has high stability and is suitable for large-scale industrial production, offering significant economic and environmental benefits.

A recirculating aquaculture system for producing aquatic species suitable for human consumption includes: a culture tank providing habitat for a selected aquatic species; a plurality of subsystems in communication with the culture tank and configured to recirculate and treat water within the system, the plurality of subsystems comprising: a solids control subsystem for removing particulates in the water, a recirculating pump subsystem for recirculating water within the system, an aeration / stripping subsystem for contacting air and water to strip carbon dioxide out of the water and into the air, a pH control subsystem to maintain the alkalinity of the water, an oxygenation subsystem for providing oxygen to the water, and an optional ozonation subsystem for providing ozone to the water; and wherein the water comprises iron cations at a concentration of at least about 0.1 ppm. Methods of maintaining the recirculating aquaculture system are also described.

The utility model discloses an automatic pH control device for fed-batch dilute sulphuric acid in an acidification lignin production process, which comprises a dilute sulphuric acid fed-batch pipeline and a reaction kettle, one side of the surface of the dilute sulphuric acid fed-batch pipeline is provided with a corrosion-resistant electric adjusting ball valve, and the other side of the surface of the dilute sulphuric acid fed-batch pipeline is provided with a corrosion-resistant electromagnetic flowmeter. One end of the dilute sulfuric acid fed-batch pipeline penetrates through the inner wall of the reaction kettle and is fixedly communicated with an annular pipe, a dosing hole is formed in the surface of the annular pipe, and an online pH meter is fixedly mounted at the bottom of the inner wall of the reaction kettle. Through automatic program fed-batch, the product quality of each batch is stable, the carbonization phenomenon during sulfuric acid addition is reduced, the product quality is improved, the situation of excessive sulfuric acid fed-batch is also solved, production can be carried out in a relatively closed environment, and pollution is reduced.

Microbeads capable of controlling the pH of a sample are provided. The microbeads can control the pH of a sample to be equal, similar or close to a target pH without an automated device and the like such as an additional valve system for controlling pH, and thus could be readily applied to fields requiring pH control.

The invention provides a preparation method of 2-hydroxy-5-trifluoromethylpyridine, which specifically comprises the following steps: S101, preparing raw materials; s102, heating and mixing the raw materials; s103, carrying out normal-pressure heat preservation reaction; s104, centrifuging the primary product material; s105, adding an alkaline raw material for neutralization; s106, adding water into the primary finished product, and centrifuging; and S107, drying and obtaining a finished product. Through gradient heating control, decomposition or polymerization byproducts caused by local overheating are avoided; the product purity is excellent, the pH is accurately regulated and controlled, three-stage centrifugal purification is combined, unreacted raw materials, acidic by-products and inorganic salts are effectively removed, and the strict requirements of medical intermediates on key impurities are met; pigment impurities with poor thermal stability can be specifically removed by utilizing a hot water recrystallization step, and the product appearance reaches white crystals which are superior to faint yellow solids obtained by a conventional method; the method is mild in reaction condition, low in equipment requirement and suitable for large-scale production, especially low-temperature vacuum drying and VOCs emission reduction, and meets the green chemical requirement.

A pool system includes a water sensing device. The water sensing device may locally control a pH of a sensing region of the water sensing device including water of a pool or spa. Additionally, or alternatively, the water sensing device may electrochemically sense free chlorine in the sensing region after locally controlling the pH of the sensing region.

The present invention provides a carbon dioxide capture system with pH control functionality, allowing electrolyte recirculation.

This invention relates to the field of food fermentation technology, specifically to a high-efficiency fermentation process for purple sweet potato rice wine. It aims to solve the technical problems of significant anthocyanin degradation and fading, difficulty in balancing flavor and efficiency, poor strain adaptability, and short shelf life during the fermentation of purple sweet potato rice wine. This invention improves product quality and fermentation efficiency by constructing a specialized compound fermenting agent and employing a two-stage fermentation process with dynamic pH control. The compound fermenting agent consists of *Rhizopus oryzae*, *Monascus purpureus*, *Kluyveromyces martensii*, and *Lactobacillus plantarum*. The fermentation process employs two stages: the first stage is aerobic fermentation, which promotes the stable existence of anthocyanins and facilitates enzyme activity; the second stage is anaerobic fermentation, which further stabilizes the color and inhibits unwanted microorganisms. This invention uses ultra-high pressure sterilization combined with post-treatment with natural antioxidants to sterilize and preserve the purple sweet potato rice wine, which can improve the pigment retention rate and significantly extend the shelf life of the purple sweet potato rice wine.

The invention relates to saccharomycetes as well as a domestication method and application thereof, and belongs to the technical field of microorganisms. The saccharomycetes are Pichia kudriavzevii HT13, and are preserved in the Guangdong Microbial Culture Collection Center on August 15, 2025, and the preservation number of the saccharomycetes is GDMCC No: 66848. According to the method for domesticating the acid-resistant yeast strain, the acid-resistant yeast with good substrate conversion performance is obtained, the performance is stable, the adaptability in the industrial production environment is good, the fermentation level under pH regulation can still be achieved without pH control, the production cost is low, and the method has wide industrial application prospects.

The application relates to the technical field of process control, in particular to a pH dynamic regulation method and system in a plant calcium extraction process, which comprises the following steps: constructing a pH-temperature and calcium dissolution rate lookup table model; based on the model, a multi-stage optimal control problem with the minimum total time as the target is established, and a dynamic programming algorithm is used for solving, so that continuous optimal pH and temperature control trajectories are generated; a compound controller combining feedforward and feedback is designed to accurately track the trajectories; an online trajectory correction mechanism is established, when it is monitored in real time that the process state seriously deviates from the expectation, the re-planning can be automatically triggered, the control strategy is dynamically adjusted and updated. The application deeply integrates process modeling, optimal control and adaptive adjustment, realizes dynamic optimization and closed-loop control of the whole cycle of the plant calcium extraction process, significantly shortens the extraction time, and improves the extraction rate of calcium and the stability of the quality of the final product.

This invention belongs to the field of bio-fermentation technology and discloses a method for improving glutamic acid fermentation by using liquid alkali in conjunction with liquid ammonia to regulate pH. The method includes the following steps: when glutamic acid fermentation has reached 6, 7, or 8 hours, pH is adjusted using a combined liquid alkali and liquid ammonia feedstock to control the pH at approximately 7.0 until fermentation is complete. This invention, by employing a liquid ammonia-liquid alkali synergistic regulation strategy in the early stages of fermentation, effectively balances the relationship between nitrogen supply and pH control, thereby improving the level of glutamic acid fermentation.

The invention relates to the technical field of organic synthesis, and particularly discloses a synthesis method of glycyl-L-tyrosine, which comprises the following steps: (1) protective reaction; (2) esterification reaction; (3) condensation reaction; (4) performing deprotection and hydrolysis reaction; and (5) purification reaction. According to the method, condensation is carried out under the conditions of low temperature and directional pH control by adopting a strategy of combining BOC protection of glycine amino and L-tyrosine methyl esterification pretreatment, and finally, synchronous deprotection and three-stage purification are carried out through an ultrasonic-assisted micro-nano bubble interface driving process. And the remarkable technical effects of high purity, low cost, environment friendliness and stable process are achieved.

This invention relates to an automatic alkali addition system for coking wastewater, comprising an alkali storage tank, a conveying unit, a pipeline unit, a detection unit, and a control unit; and an automatic alkali addition method for coking wastewater, comprising the following steps: 1) setting a target pH value according to the ammonia nitrogen compliance requirements of the coking wastewater; 2) collecting the measured pH value at the outlet of the ammonia stripping tower wastewater in real time and transmitting it to the control unit in real time; 3) the control unit, based on the measured pH value and the target pH value, using a PID algorithm, obtaining a control signal for adjusting the stroke or frequency of the alkali metering pump; 4) the conveying unit, based on the control signal obtained in step 3), adjusting the alkali dosage in real time; 5) the control unit continuously collecting the measured pH value and repeating steps 2) to 4), dynamically correcting the alkali dosage in real time, which can effectively achieve unblocked continuous operation of the pipeline, precise pH control, while reducing alkali consumption and maintenance costs.

Lactic acid is prepared by fermenting a carbohydrate source in the presence of a calcium hydroxide-based pH control agent that comprises from about 0.1 to about 10 wt % silica to form a fermentation broth comprising lactic acid and calcium lactate. The fermentation broth is processed by a sequence of hydrocyclones to remove silica from the feed streams to avoid fouling of equipment and to avoid damage to filtration or centrifugation equipment. The biomass component of the fermentation broth is separated out prior to acidulation of the fermentation broth, and therefore itself is a viable product for use since it can be provided without filter aid components that were previously required when the biomass was removed during acidulation. Gypsum is recovered after the acidulation step, and can be available as a product by itself, or combined with the biomass as a mixed product.

This invention provides an online pH control device for industrial fluids, characterized by comprising a pH adjustment agent dispensing unit and a pH detection unit. The pH adjustment agent dispensing unit dispenses a pH adjustment agent into the fluid tank. The pH detection unit comprises a pH detection chamber, a pH detection device, and a liquid collection device. One end of the liquid collection device is inserted into the liquid phase of the fluid tank, and the other end is connected to the pH detection chamber to input a liquid sample from the fluid tank into the pH detection chamber. The pH detection device is installed in the pH detection chamber to detect the input liquid sample. This device features high sensitivity, a compact structure, and small size, making it more convenient to operate and suitable for intelligent liquid storage management scenarios in fields such as machining, pharmaceuticals, environmental protection, and energy.

The present invention relates to a constructing method for delaying corrosion of radioactive waste disposal container in concrete disposal vault and, more specifically, to a constructing method for delaying corrosion of radioactive waste disposal container in concrete disposal vault in which backfill, placed to the top, combines pH control capsules, thereby dissolving the pH control capsules in rainwater, and a pH controller, inside, is discharged, thereby preventing decrease of pH of the backfill below 8.5 and delaying corrosion in the disposal containers, upon filling in backfill after placing radioactive waste disposal containers in the concrete vault.

The invention provides copper recycling equipment for copper-containing waste treatment, which is suitable for the field of copper-containing waste recovery in the electronic industry, and comprises a reaction kettle I, the reaction kettle I is externally connected with a pH adjusting unit I, and a pH adjusting assembly is additionally arranged in the pH adjusting unit I; the pH adjusting assembly comprises a pH adjusting pipe group I, a shaking connecting piece and a pH adjusting pipe group II; the pH adjusting pipe group I and the pH adjusting pipe group II adopt the same structure; the pH adjusting pipe group I comprises a distribution box, and after the distribution box receives high-concentration copper-containing waste liquid introduced into the reaction kettle I, the high-concentration copper-containing waste liquid is dispersed, distributed and introduced into a plurality of distribution pipes included in the pH adjusting pipe group I and the pH adjusting pipe group II; the shaking connecting piece is used for shaking the plurality of distribution pipes; on the basis of gradually adjusting the pH value of the high-concentration copper-containing waste liquid in the reaction kettle I, the high-concentration copper-containing waste liquid is guided into a plurality of distribution pipes for dispersion fine treatment through dispersion distribution, so that the high-concentration copper-containing waste liquid with various volumes can be easily treated, and the comprehensiveness and uniformity of pH value control are ensured.

Provided herein are secretory compositions / cocktails derived from a novel, extremophilic fungal species cultured, isolated, and characterized herein. Said novel, extremophilic fungal species may be exploited to produce secretory compositions / cocktails which comprise a unique mixture of thermo-tolerant, stable enzymes capable of digesting cellular and genetic material in its surroundings under extreme temperatures. Such secretory compositions / cocktails may be useful as cleaning and sterilization solutions against biofilm, urine, yeast, bacterial, or viral contamination. Other uses include, but are not limited to, urea removal, fertilizer wastewaters, wastewater reclamation for life support systems in space, pH control, source of ammonia and carbon dioxide, starch digestion, biofuel production, as pharmaceuticals, and medical treatments such as wounds, skin disorders, or nail disorders.

This invention discloses a method and apparatus for dynamic pH control of autoclaved aerated concrete (AAC) blocks. The method includes: collecting data on the pH value of the gasified fly ash slurry after preparation and the amount of raw materials added, and inputting this data into a backpropagation neural network prediction model to output predicted values; comparing the predicted values ​​with a pre-set target range, and if the predicted values ​​exceed the target range, calculating the required dosage of alkaline reagent and performing reagent addition at one or more control nodes; collecting the actual pH value and product compressive strength after pouring, comparing them with the predicted values ​​to obtain error results, and triggering online incremental updates of the backpropagation neural network prediction model when the error results exceed a set threshold. The apparatus includes: an online pH monitoring unit, a weighing and metering unit, a data acquisition and transmission unit, an intelligent control unit, and a reagent addition unit. This invention achieves pre-pouring prediction and multi-node collaborative control, stabilizing the slurry pH value within the target range.