139 results about "Ph control" patented technology

The embodiment of the invention provides a hydrochloric acid PH control device in a germanium oxide production process and a control method thereof, and belongs to the field of chemical process automatic control. The device comprises an acid liquor storage tank used for storing raw liquor hydrochloric acid and connected to an acid mixing tank through a raw acid feeding control valve; the acid mixing tank is used for mixing an acid solution with a diluent and is connected to the pH regulation reaction tank through a mixed acid feeding control valve; the alkali liquor storage tank is connected to the pH regulation reaction tank through an alkali liquor adding control valve; the pH regulation reaction tank is used for receiving the mixed acid liquor and the alkali liquor and regulating the pH value of a reaction system, and is provided with a pH sensor for detecting the pH value in real time; and the control unit is used for dynamically adjusting the opening degree of each valve by adopting an improved fuzzy self-adaptive PID control algorithm according to a detection result of the pH sensor so as to control the pH value to be within a target range. According to the scheme, the problems of overshoot and lag caused by traditional fixed parameter PID adjustment are solved, and therefore the stability of the pH value of the solution and the consistency of the technology in the germanium oxide production process are guaranteed.

The invention relates to the technical field of water quality regulation and control, in particular to a mung bean sprout cultivation water quality dynamic regulation and control method and system.The mung bean sprout cultivation water quality dynamic regulation and control method comprises the following steps of collecting a rhizosphere and main water body conductivity time sequence, analyzing an extreme point lag difference, recognizing an absorption active stage, dynamically adjusting a pH set value and evaluating regulation and control response stability; a liquid injection trigger threshold value is optimized according to the conductivity slope ratio, and a water quality regulation and control result is output. According to the method, conduction delay between conductance signals can be recognized in real time by collecting rhizosphere liquid phase and main water body conductivity time sequence data and constructing change slope and lag difference data, and therefore the active absorption stage of the rhizosphere of the mung bean sprouts is extracted. A stable trend label can be constructed according to the judgment of the continuity and the change direction of the absorption stage, so that the regulation and control basis has more physiological correlation. In the aspect of pH control, a hydrogen ion concentration regulation target and exponential response logic are introduced to realize dynamic convergence of an acid-base balance control target, so that a regulation result is closer to an absorption state.

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 the technical field of wastewater treatment, in particular to an automatic pretreatment method and system.The method comprises the steps that firstly, according to the pH value of the current hour and related index data, the pH value of the next hour is predicted, and an initial pH predicted value is obtained; then analyzing the change similarity of the pH value in the known time period of the today and the corresponding time period of any historical day, and correcting the initial predicted pH value once to obtain a corrected predicted pH value; performing secondary correction on the pH correction predicted value by analyzing the influence of the adjacent filter grids on the change of the pH value of the wastewater in the current filter grid to obtain a pH predicted value; and finally, according to the pH predicted value, an agent is put into each filtering grid through an automatic agent adding system. According to the method and the system, the future pH value is predicted, so that the timeliness of pH regulation and control is improved, and the wastewater treatment effect is ensured.

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.

Nano- and micro-particles (NMP) can be formed from an oil / water emulsion. The emulsion is made by mixing a liquid solvent, at least one surfactant, a particle-forming compound, and at least curing agent. If desired, pH control agents and viscosity enhancers can be added to the liquid solvent. The particle-forming compound and the curing agents are mixed together and form the oil phase in the emulsion and after curing, the particles are formed. The nano- and micro-particles can be used as proppant to enhance the conductivity of nano- and microfractures and fluid-loss-control additive for hydraulic fracturing operations.

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.

The invention relates to the technical field of control optimization, and discloses a fishery experiment pH control optimization method comprising the following steps: S1, setting a fishery experiment environment target pH value, and inputting the real-time pH value into a fishery experiment pH controller; s2, setting a proportionality coefficient, an integral coefficient and a differential coefficient of a traditional PID control algorithm by using an improved children learning optimizer, and applying the optimized PID control algorithm to a pH controller of a fishery experiment to obtain an enhanced pH controller; s3, calculating an experimental environment pH difference value between the real-time pH value and the target pH value, inputting the experimental environment pH difference value into an enhanced pH controller, and outputting a pH control quantity signal; and S4, outputting an adjustment concentration control quantity of carbon dioxide by the pH control quantity signal through a control quantity signal conversion model, adjusting the carbon dioxide concentration of the fishery experimental environment, returning to the step S1 to the step S4, monitoring the real-time pH value, adjusting the pH control quantity signal, and rapidly and accurately reaching the target pH value.

A system and method for improved fermentation and elutriation of wastewater solids by controlling the concentration of inhibitory products in the fermenter using enhanced elutriation, micro-aeration or fractional aeration, and pH control, and improved characteristics of the elutriated product by controlling the leakage of phosphorus and reducing the formation of odorous sulfur compounds.

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.

Some aspects of the present disclosure are generally related to systems and methods configured for growing microalgae and / or macroalgae, for example, for biomass generation or other applications. In some embodiments, the microalgae and / or macroalgae may be grown using carbon from CO2 generated from biological sources, and thus the microalgae and / or macroalgae may be certified as organically grown in some cases. According to some embodiments, the systems described herein introduce CO2 into the water in which the microalgae and / or macroalgae are grown and optionally, the systems may be configured to monitor and / or adjust a flow rate of the CO2 to regulate a pH of the water. Still other aspects are directed to methods of using the systems, kits including such systems, or the like.

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.

The present invention relates to a method and device for separating mixed monobasic organic acids in fermentation liquid by pH control, and belongs to the technical field of organic acid separation. The method comprises introducing fermentation liquid into a desalination chamber; introducing a first electrolyte solution into a buffer chamber connected and symmetrically arranged on both sides of the desalination chamber, and a concentration chamber connected and symmetrically arranged on both sides of the buffer chamber, and regulating the pH of the solution in the buffer chamber by the first electrolyte solution; introducing a second electrolyte solution into a cathode chamber and an anode chamber respectively arranged on both sides of the connected concentration chamber; applying direct current to both ends of the cathode arranged in the cathode chamber and the anode arranged in the anode chamber to complete the separation of mixed monobasic organic acids in the fermentation liquid. The present invention separates mixed monobasic organic acids in the fermentation liquid by pH control electrodialysis technology, and the recovery rate of the monobasic organic acid reaches more than 92%, and the purity can reach more than 99%, which greatly improves the recovery rate and purity of the monobasic organic acid.

A process for mechanical separation of sorbent particles in a Direct Lithium Extraction (DLE) process using an ultrafiltration membrane and / or nanofiltration membrane. Also disclosed is a system for mechanical separation of sorbent particles in a Direct Lithium Extraction (DLE) process using an ultrafiltration membrane and / or nanofiltration membrane. Also disclosed is an improved DLE process with a pH controlled upload step.

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 invention discloses a pH control system for coal coking circulating liquid, comprising a pH control system for acid washing tower circulating liquid and a pH control system for alkali washing tower circulating liquid. A pH detection control device is arranged between the pH control system for acid washing tower circulating liquid and the pH control system for alkali washing tower circulating liquid. The pH of the spraying liquid of the acid washing tower and the alkali washing tower is monitored and analyzed in real time and compared with the set pH by the pH detection control device. The opening of the automatic regulating valve is controlled according to the output signal of the comparison result, so as to realize automatic monitoring, detection and control of the pH of the spraying liquid of the acid washing tower and the alkali washing tower. The invention has the beneficial effects of realizing automatic monitoring, detection and control of the pH of the acid washing tower and the alkali washing tower, reducing labor, replacing manual detection and testing with a pH detector, eliminating human unsafe factors, and realizing all-weather real-time detection by the pH detector, with high operation accuracy, high acid and alkali dosage accuracy, and energy saving and consumption reduction.