Application of SCD Streaming Current detector in Coagulant Dosage Control of Water Treatment
Application of SCD Streaming Current detector in Coagulant Dosage Control of Water Treatment
Coagulation and chemical dosing form the cornerstone of raw water treatment in water plants, as their effectiveness directly determines the success of subsequent sedimentation, filtration, and disinfection processes. Traditional manual dosing methods, relying on empirical adjustments, struggle to adapt to water quality fluctuations. The SCD Flow Current Meter, a single-factor coagulation dosing control device, achieves precise regulation through real-time monitoring of flow current (Streaming Current), representing a pivotal technology for modern water plants' automation upgrades.
I. Working principle of SCD current meter
1. Physical basis of flow current
Colloid particle characteristics: colloidal impurities in raw water (such as clay, organic matter) have negative surface charge and are difficult to gather due to mutual repulsion.
Function of coagulant: after adding coagulant with positive charge (such as polyaluminum chloride), the colloid is destabilized through charge neutralization and microfloc is formed.
Flow current generation: When water flows through the detection unit of SCD flow current meter, the friction between charged particles and detection probe will generate current (flow current), whose intensity is directly related to the charge state of colloids in water.
2. Closed-loop control logic
Dynamic monitoring: The SCD flow current meter continuously monitors the flow current signal to reflect the degree of colloid destabilization.
Feedback adjustment: When the turbidity or colloidal concentration of raw water changes, the flow current deviates from the set value. The SCD flow current meter automatically adjusts the frequency of the coagulant addition pump to increase or decrease the dosage of the agent, so that the flow current returns to the target range.
No human intervention: fully automated to avoid human misjudgment or delayed response.
II. Technical Advantages of SCD Current Flow Meter
1. Accuracy and efficiency
Direct detection of colloidal charge state is more sensitive than the traditional indirect control relying on turbidity and pH.
With a short response time, it can quickly respond to sudden changes in water quality such as heavy rain and algal outbreak, and reduce the problem of "running alum" or insufficient coagulation.
2. Save on chemicals and costs
While traditional methods often over-dose chemicals (with safety margins), the SCD flow current meter dynamically optimizes dosing, saving 10% to 30% of coagulant.
Reduce sludge production and reduce the cost of subsequent sludge treatment.
3. Simplify operations and adaptability
No frequent manual sampling and testing is required, reducing the workload.
Suitable for different water sources and a variety of coagulants.
III. Practical Case Study of SCD Current Meter
Case 1: A water plant with a daily treatment capacity of 200,000 tons and a high turbidity of river water used an SCD flow current meter to control the dosage of chemicals, and the dosage of polyaluminum chloride was reduced from 35.3kg/kt to 25.6kg/kt.
Case 2: A water treatment plant with reservoir water source, high pH fluctuation and high algae content, treating 150,000 tons of water daily, reduced the probability of alum leakage in sedimentation tank and extended the backwash cycle of filter tank after adopting SCD flow current meter to control chemical dosage.
Case 3: When the raw water turbidity at a water treatment plant spiked from 20NTU to 200 NTU, the SCD flow meter automatically adjusted the chemical dosage from 13 kg/kt to 24 kg/kt, while maintaining the sediment water turbidity at approximately 0.8 NTU.
The SCD Streaming Current Meter revolutionizes coagulant dosing from empirical to data-driven operations through its real-time feedback mechanism, significantly enhancing water quality stability and operational efficiency. This technology serves as a crucial foundation for water treatment plants transitioning to smart systems. With the deepening integration of multi-parameter fusion and AI technologies, future coagulant control will achieve unprecedented precision and efficiency, ensuring robust safeguards for safe water supply.
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