Variable frequency constant pressure water supply equipment

Variable frequency constant pressure water supply equipment | Energy-saving and stable · Fully automatic constant pressure water supply

This equipment employs advanced variable frequency speed control technology, using pressure sensors to monitor pipeline pressure in real time and automatically adjust the pump speed and number of pumps in operation to maintain the outlet water pressure within the set range. Regardless of changes in water consumption, the water pressure at the user end remains constant. The system integrates a variable frequency control cabinet, pump unit, pressure sensor, pressure tank, and pipeline accessories. Compared to traditional fixed frequency water supply, it can save 30% to 60% of electricity while avoiding water hammer and extending equipment life. It is widely used in high-rise buildings, residential communities, factories, hotels, farmland irrigation, and the renovation of old pump stations.

core components

Variable Frequency Control Cabinet: PLC or dedicated water supply controller + frequency converter, PID closed-loop regulation, supports multi-pump rotation and fault redundancy.

Pump Units: Vertical multistage centrifugal pumps or stainless steel horizontal pumps (2-6 units), flow rate and head can be combined as needed, low noise, high efficiency.

Pressure Sensors: Remote pressure gauges or 4-20mA pressure transmitters, providing real-time feedback of pipeline pressure.

Pressure Tanks: Diaphragm or bladder-type pressure stabilizing tanks, used for low-flow pressure maintenance and preventing water hammer, reducing frequent pump start-stop cycles.

Pipelines and Valves: Stainless steel or galvanized steel pipes, equipped with check valves, butterfly valves, flexible joints, and inlet/outlet assemblies.

Optional Accessories: Level controller (water tank water shortage protection), remote monitoring module, flow meter, disinfection device.

Working principle

A pressure sensor is installed at the outlet of the water supply network, transmitting pressure signals to the frequency converter in real time. The controller compares the measured pressure with the user-set pressure, performs PID calculations, and outputs a frequency command to the frequency converter to adjust the water pump speed. When water consumption increases, causing a drop in pressure, the water pump accelerates; when water consumption decreases, the water pump decelerates; when water consumption is extremely low, the water pump enters sleep mode and the pressure is maintained by a pressure tank; when multiple pumps are used, the number of operating pumps can be automatically increased or decreased. The entire process is fully automatic and requires no manual intervention.

Main advantages

Constant Pressure Comfort: The water pressure remains constant, eliminating fluctuations at the user end, ensuring stable operation for showers, washing machines, etc.

Significant Energy Savings: Variable frequency soft start eliminates inrush current; automatic speed adjustment based on water demand results in average energy savings of 30%–60%.

Pipeline Safety: Eliminates water hammer from direct start-up, reducing the risk of pipe bursts and pump damage.

Automatic Pump Rotation: Multiple pumps can rotate on a timed basis, balancing wear and extending the overall lifespan of the unit.

Fault Protection: Equipped with overload, phase loss, dry running, and overpressure protection functions, and automatically activates the backup pump.

Easy Installation: Integrated skid-mounted design; simple inlet and outlet flange connection; compact footprint.

Optional Remote Monitoring: Monitor pressure, frequency, and fault status via mobile app or host computer.

Technical parameters

Flow rate range: 2 – 500 m³/h (customizable)

Head range: 20 – 250 m

Number of pumps: 1–6 units (commonly 2 in operation, 1 on standby or 3 in operation, 1 on standby)

Control method: Constant pressure variable frequency (PID)

Pressure control accuracy: ±0.01 MPa

Power supply: Customizable

Pressure tank capacity: 8L – 500L (diaphragm type)

Pipeline material: 304 stainless steel / galvanized steel

Installation method: Vertical or horizontal skid-mounted

Application areas

Secondary water supply for high-rise residential buildings, villas, hotels, and schools; factory production water and flushing systems; agricultural greenhouse irrigation and sprinkler systems; hot water system makeup and boiler pressure-regulating water makeup; automated energy-saving renovation of existing old pump rooms. We can provide pump selection and control system configuration based on your water flow rate, head, building height, and number of users. Welcome to send parameters to obtain a quotation and solution diagram.

Company Profile

AA SS AQUA HITECH CO., LTD. was established in 2005 in Shenzhen, China. It is a leading technology enterprise specialized in the design, manufacturing, installation, commissioning and maintenance of technical solutions for high-difficulty industrial wastewater treatment projects.

Since its establishment, the company has been fully committed to the research of treatment technologies for high-difficulty and refractory industrial wastewater, wastewater recycling and reuse technologies, and wastewater zero-discharge technologies. It strives to achieve low project costs, high outputs and optimization of total social resources.

The water treatment technology solutions and achievements developed by the company have been widely applied in multiple fields of high-difficulty and refractory organic wastewater treatment, including pharmaceutical wastewater, chemical wastewater, pesticide wastewater, laboratory wastewater, coal chemical wastewater, petrochemical wastewater, breeding wastewater, slaughterhouse wastewater, semiconductor wastewater, printing and dyeing wastewater, coating wastewater, landfill leachate, food processing wastewater, mechanical processing wastewater and domestic wastewater.

Adhering to the business philosophy of leading technology, first-class quality and sustainable service, the company endeavors to provide customers with strong technical support and realize the sustainable development and utilization of water resources.

The electrochemical wastewater treatment equipment independently developed and invented by our company can achieve a removal rate of over 99% for COD and ammonia nitrogen in refractory industrial organic wastewater featuring high salinity, high toxicity, high concentration and strong acidity or alkalinity. It has solved the long-standing problem of high-difficulty and complex wastewater treatment in the industrial wastewater treatment industry, representing a significant breakthrough in the treatment scope, methods and effects of high-difficulty and complex industrial wastewater.

CQDHX SERIES EO Electrochemical Advanced Oxidation Technology

Cutting-edge Electrode Manufacturing Technology

Over a 15-year period starting from 2010, we have been dedicated exclusively to the R&D, manufacturing and application of electrodes. Having completed more than 3,000 verification tests on electrode materials and manufacturing processes, as well as over 5,000 experiments on different types of highly complex wastewater, we have tailored the compositions of electrode substrates, surface materials and the deposition conditions of electrode surfaces by integrating the characteristics of various highly complex wastewater types. This has enabled us to achieve optimal performance in treating different categories of highly complex wastewater.

The CQDHX Series Electrode Modules are capable of meeting the requirements for treating highly complex industrial wastewater under extreme conditions. They can effectively remove organic matter (COD), ammonia nitrogen, toxic substances, bacteria, chromaticity, phosphorus and various heavy metals from refractory industrial organic wastewater characterized by high salinity, high toxicity, high concentration and strong acidity or alkalinity.

Working Mechanism of CQDHX SERIES EO Electrode Modules

Electrochemical oxidation is a technology that utilizes an applied electric field to drive chemical reactions for pollutant degradation. Its core reaction occurs at the anode of the electrolytic cell, and the operating mechanisms are primarily categorized into two types: direct oxidation and indirect oxidation, which often function synergistically.

Direct Oxidation Mechanism: Pollutant molecules migrate to and adsorb onto the anode surface. Subsequently, the anode, acting as an electron acceptor, directly extracts electrons from the pollutant molecules, causing their oxidative decomposition. This process is controlled by the mass transfer rate and relies on the catalytic activity and adsorption properties of the anode material, exhibiting a certain degree of selectivity towards different pollutants.

Mechanism of Indirect Oxidation: The anode does not directly oxidize pollutants. Instead, it generates highly oxidizing agents by electrolyzing components within the solution. These agents then diffuse into the bulk solution and carry out homogeneous oxidation of the pollutants. Depending on the type of oxidants generated, the main pathways can be categorized as follows:

Electrochemical oxidation achieves pollutant degradation through two main mechanisms: electron transfer at the anode surface and the in-situ generation of highly oxidizing species. In practical applications, particularly for complex wastewater systems, direct and indirect oxidation often work synergistically. By optimizing electrode materials and process parameters, efficient and advanced treatment of organic pollutants can be achieved.

 Technical Advantages

High Salinity Tolerance: It can effectively remove COD and ammonia nitrogen from unsaturated saline wastewater with a removal rate of up to 99%.

High Toxicity Tolerance: It can effectively remove COD and ammonia nitrogen from highly biotoxic wastewater with a removal rate of up to 99%, while efficiently eliminating the biological toxicity of the wastewater.

High Concentration Tolerance: It can effectively remove COD and ammonia nitrogen from high-concentration organic industrial wastewater with a COD level of ≤ 450,000 mg/L, achieving a removal rate of up to 99%.

Strong Acid-Alkali Tolerance: It can effectively remove COD and ammonia nitrogen from strongly acidic or alkaline wastewater with a pH value ranging from 1 to 11, with a removal rate of up to 99%.

High Safety: The equipment operates at a DC voltage ranging from 3 to 15V, causing no harm to the human body.

No chemical agents are added during wastewater treatment, and no residues or solid wastes are generated.

The electrode modules operate without scaling or clogging.

The equipment achieves a removal rate of 75–100% for high ammonia nitrogen, cyanide breakdown, decolorization, and other pollutants.

No pH adjustment is required for incoming wastewater, which significantly saves on acids, alkalis, labor costs, and floor space, while avoiding secondary pollution.

No water dilution is needed to reduce the salinity of incoming wastewater, decreasing the system’s treatment load and conserving resources.

No water dilution is needed to reduce the COD concentration of incoming wastewater, decreasing the system’s treatment load and conserving resources.

The equipment features a small footprint, occupying approximately 2% of the floor space required by traditional processes of the same capacity.

The equipment has no special environmental requirements and can be installed in well-ventilated, rainproof, non-explosion-proof areas.

The equipment operates with no noise and zero discharge of secondary pollutants.

It features fully automated operation, which is simple, safe, and does not require on-site personnel monitoring.

Equipment Specifications: 0.5T–1000T/h

Electrochemical Oxidation Equipment for Treating Common Pollutants

Application Scenarios:

Treatment of Refractory and Toxic Pharmaceutical Wastewater

Treatment of Refractory and Toxic Chemical Industry Wastewater

Treatment of Refractory and Toxic Pesticide Wastewater

Treatment of Refractory and Toxic Laboratory Wastewater

Treatment of Refractory and Toxic Coal Chemical Industry Wastewater

Treatment of Refractory and Toxic Petrochemical Wastewater

Treatment of Aquaculture Wastewater

Treatment of Slaughterhouse Wastewater

Treatment of Refractory and Toxic Semiconductor Industry Wastewater

Treatment of Refractory and Toxic Dyeing Wastewater

Treatment of Refractory and Toxic Painting/Paint Coating Wastewater

Treatment of Refractory and Toxic Landfill Leachate

Treatment of Food Processing Wastewater

Treatment of Refractory Machining Wastewater

Treatment of Domestic Sewage