Flocculation and sedimentation equipment

Flocculation and sedimentation equipment | High-efficiency solid-liquid separation · Fully automatic dosing flocculation system

This equipment is specifically designed to remove suspended solids (SS), colloidal particles, and some organic matter from water. By adding flocculants and coagulants, tiny particles are aggregated into large flocs, which are then separated into solid and liquid components in a sedimentation tank. The system integrates a dosing device (dosing tank, mixer, dosing pump), a reaction tank (with agitator), and an inclined tube/plate sedimentation tank. It features a compact structure, stable operation, and is widely used for various wastewater pretreatment and advanced treatment processes.

core components

Fully Automatic Dosing System: Includes a PE/PP dosing tank, top-mounted mixer, and corrosion-resistant dosing pump (mechanical diaphragm or metering pump). Multiple sets can be configured for dosing PAC, PAM, etc.

Reaction Tank (Flocculation Tank): Equipped with a low-speed mixer to ensure thorough mixing of chemicals and wastewater, promoting floc growth.

Sedimentation Tank: Employs inclined tube/plate packing or a horizontal flow design, featuring high surface loading, convenient sludge removal, and clear effluent.

Electrical Control System: PLC automatic control, capable of联动 (linking) water intake, mixing, dosing, and sludge removal, supporting manual/automatic switching.

Working principle

Mixing and Reaction: Wastewater enters the reaction tank. A dosing device quantitatively adds flocculants (such as polyaluminum chloride, PAC) and coagulant aids (such as polyacrylamide, PAM). A mixer rapidly disperses the agents, forming tiny flocs, which are then slowly stirred to enlarge into dense flocs.

Sedimentation and Separation: The flocs enter the sedimentation tank and settle to the bottom sludge hopper by gravity. The supernatant is discharged through the effluent channel or enters the next unit.

Sludge Removal: Bottom sludge is removed periodically or continuously. Sludge dewatering equipment can be used as an adjunct.

Main advantages

Highly efficient turbidity removal: Suspended solids removal rate reaches over 90%, effluent turbidity is as low as below 5 NTU.

Automatic dosing: Automatically adjusts the dosing amount based on influent flow rate or turbidity signal, saving on reagent costs.

Wide range of applications: Suitable for sand washing wastewater, mine water, dyeing and printing wastewater, food processing wastewater, river dredging, etc.

Durable structure: Reaction tanks and sedimentation tanks can be made of corrosion-resistant carbon steel or SS304/316 stainless steel; dosing tanks and pipelines are corrosion-resistant.

Easy operation: One-button start/stop, low maintenance requirements; optional pneumatic sludge discharge valve.

Technical parameters

Processing capacity: 1 – 200 m³/h (customizable)

Reaction tank mixer power: 0.37 – 7.5 kW

Sedimentation tank surface loading: 1.0 – 3.0 m³/(m²·h)

Sedimentation zone residence time: 2 – 4 h

Dosing tank capacity: 200L – 2000L/set

Dosing pump flow rate: 5 – 500 L/h

Overall material: Carbon steel with epoxy anti-corrosion coating / Stainless steel 304/316

Application areas

Wastewater treatment from mining and quarrying sand washing

Municipal wastewater treatment plants (coagulation and sedimentation section)

Wastewater from textile printing and dyeing, papermaking, and electroplating industries

Rainwater and river water purification

Construction mud wastewater treatment

We can provide process calculations and equipment layout diagrams based on your raw water quality, treatment capacity, and discharge requirements. Welcome to provide water quality parameters to obtain customized solutions.

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