10 results about "Lime softening" patented technology

A system and method for process water and oxide coating recovery and distribution in a direct reduction system, such as a system for producing direct reduced iron. A warm lime softener is used to remove (recover) calcium, alkalinity, and other constituents from the process water system and to produce an effluent that can be further processed and returned as makeup to the process water system. The lime softening process requires lime (or similar material) to be added to the influent, thereby increasing the calcium and pH levels until they become supersaturated and precipitate. This chemical process results in effluent that is low in calcium, alkalinity, and total suspended solids.

This disclosure provides a two-step process to produce monocalcium phosphates from lime water treatment plant lime softening residuals and from other sources containing calcium salts. This patent focuses on the reuse of lime softening residuals to produce monocalcium phosphates and dicalcium phosphates for use in a variety of applications including as quick release and slow release fertilizers, for animal feed and other applications. The two-step process is conducted close to ambient temperatures and under controlled pH conditions to produce substantially pure calcium phosphate products while at the same time capturing the carbon dioxide generated in the process.

Disclosed are methods and compositions for coagulating and clarifying produced waters for use as boiler feed waters, for example for the generation of steam. The methods and compositions are especially useful for treatment of produced waters from steam-injection methods of tertiary oil recovery such as steam-assisted gravitational drainage. Disclosed are compositions comprising a first copolymer having a high molecular weight and bearing a low molar cationic charge and a second copolymer having a lower molecular weight and bearing a high molar cationic charge. The compositions are suitable for addition as coagulants to produced waters that have been treated by warm lime softening. Also disclosed are methods of treating produced waters from steam-injection oil recovery for use as boiler feed waters to generate steam in such steam injection methods

This invention relates to an integrated, staged, coupled softening system for high-hardness, high-silica water, a precise dosing method for reagents, and a control method. It belongs to the field of water treatment technology and is applicable to reverse osmosis influent pretreatment scenarios such as industrial high-salt, high-hardness wastewater and coal chemical wastewater. The system adopts a five-stage integrated nested coupled reaction-separation structure, integrating the sodium hypochlorite-enhanced oxide-magnesium agent silicon nucleation zone, lime softening zone, sodium carbonate causticizing zone, synergistic ripening zone, and pre-precipitation zone into a cylindrical shell; simultaneously establishing a Ca... 2+ Mg 2+ SiO2, COD, A eff H total This invention employs a six-element coupled reagent dosing model, coupled with a six-dimensional closed-loop intelligent coupled control module and a deep treatment integration module. It is applicable to pretreatment scenarios of high-salt, high-hardness, and high-silica wastewater with hardness of 100~4000 mg / L and COD of 50~120 mg / L, significantly improving effluent compliance to over 99.8%, reducing reagent dosing error to ≤5%, saving 25%~35% on reagent usage, reducing footprint by 65%~80%, and reducing sludge SV30 to ≤25%. It solves the problems of inaccurate reagent dosing, large footprint, low removal efficiency of complex pollutants, and poor sludge properties associated with traditional processes.

The invention discloses a lime softening treatment test system and method based on pH intelligent control. The lime softening treatment test system comprises a lime milk storage box, a test container and a waste liquid box, a first stirrer is arranged in the lime milk storage box, an outlet of the lime milk storage box is communicated with an inlet of the test container through a first metering pump, a perforated partition plate, a second stirrer and a pH meter probe are arranged in the test container, the perforated partition plate is located between the second stirrer and the pH meter probe, a discharge port of the test container is divided into three paths, and the first metering pump is connected with the first stirrer. The first path is communicated with the inlet of the waste liquid box through an alkalinity meter, the second path is communicated with the inlet of the waste liquid box through a calcium hardness monitoring meter, and the third path is communicated with the inlet of the waste liquid box through a total hardness monitoring meter.

The invention relates to the technical field of water quality on-line monitoring, and discloses an urban reclaimed water lime softening treatment water quality on-line monitoring device and a use method, the monitoring device comprises a sampling unit, a pretreatment unit, a cleaning unit, a detection unit and a control center unit; one side of the sampling unit is connected with a water inlet sampling pipe and a water outlet sampling pipe of the clarification tank, and the other side of the sampling unit is connected with the pretreatment unit through a pipeline; the pretreatment unit is used for clarifying urban reclaimed water or circulating water, and the pretreatment unit is connected with the cleaning unit through a pipeline; the detection unit comprises a phenolphthalein alkalinity meter, a total alkalinity meter, a hardness meter, a conductivity meter and a pH meter, and the detection unit is connected with the pretreatment unit and a factory discharge pipe; the control central unit is electrically connected with the sampling unit, the pretreatment unit, the cleaning unit, the phenolphthalein alkalinity meter, the total alkalinity meter, the hardness meter, the conductivity meter and the pH meter respectively. According to the invention, a plurality of water quality indexes are automatically monitored on line, and the problems of particle pollution blockage and inaccurate detection in a water sample are solved at the same time.

A system and method for process water and oxide coating recovery and distribution in a direct reduction system, such as a system for producing direct reduced iron. A warm lime softener is used to remove (recover) calcium, alkalinity, and other constituents from the process water system and to produce an effluent that can be further processed and returned as makeup to the process water system. The lime softening process requires lime (or similar material) to be added to the influent, thereby increasing the calcium and pH levels until they become supersaturated and precipitate. This chemical process results in effluent that is low in calcium, alkalinity, and total suspended solids.

The present disclosure relates to compositions including coagulants, testing methods and devices, and methods used in connection with lime softening processes, such as warm or hot lime softening processes. The compositions, devices, and methods disclosed herein may be used to improve sludge bed properties in lime softening processes, such as warm lime softening process or hot lime softening processes.

The present disclosure relates to compositions including coagulants, testing methods and devices, and methods used in connection with lime softening processes, such as warm or hot lime softening processes. The compositions, devices, and methods disclosed herein may be used to improve sludge bed properties in lime softening processes, such as warm lime softening process or hot lime softening processes.

The invention relates to the technical field of thermal power plant water treatment and automatic control, and discloses a thermal power plant lime softening system multi-agent intelligent collaborative dosing method and system.The method comprises the steps that firstly, a digital twin simulation environment coupling lime softening and coagulating sedimentation mechanisms is constructed, and a virtual interaction platform is formed; and on the basis, three independent agents are trained by using a multi-agent depth deterministic strategy gradient algorithm, the addition of lime, polyferric chloride and polyacrylamide is controlled respectively, and the learning of a collaborative strategy meeting the standard water quality and the optimal cost is guided through a maximized collaborative reward function. During online application, the dosing instruction set generated by the agent must be verified by the security constraint module embedded with the pH security boundary and the agent proportion rule, and only the verified instruction is issued to the execution unit. The method effectively solves the problem of nonlinear strong coupling of multi-agent addition, ensures that the hardness, alkalinity and turbidity of effluent stably reach the standard, and reduces the comprehensive agent consumption and operation risk.