Many companies, after equipping themselves with Sanshine screw presses, have encountered problems such as poor dewatering results (excessively high moisture content in the sludge cake), high energy consumption, and premature equipment wear due to a lack of understanding of the correct parameter adjustment methods. In fact, adjusting the parameters of a screw press is not complicated; the key is to control three crucial parameters: sludge feed rate, flocculant dosage, and screw shaft speed. This article, combined with practical steps, details the parameter adjustment methods for screw presses and incorporates Sanshine's adjustment experience to help beginners quickly achieve optimal operating conditions.

Preparation before Adjustment: First, check the condition of the screw press equipment, ensuring that the blades are not blocked, the screw shaft rotates smoothly, and there are no leaks in the seals; calibrate the metering pump and sludge feed pump of the dosing unit to ensure precise flow rates; prepare the flocculant (PAM), dissolve it at a concentration of 0.1%-0.3%, and stir for at least 30 minutes to ensure complete dissolution and no clumping.

Step 1: Adjust the sludge feed rate. The feed rate needs to be adjusted according to the screw press model and sludge concentration. The initial feed rate for small screw presses is set at 1 m³/h, and for large screw presses, it is set at 5 m³/h. Observe the equipment's operating status. If excessive sludge accumulates between the blades and the equipment vibration increases, the feed rate is too high and needs to be reduced appropriately. If the screw shaft idles and no sludge cake is produced, the feed rate is too low and needs to be increased until the sludge evenly fills the filter chamber.

Step Two: Adjust the flocculant dosage. The flocculant dosage directly affects the dewatering effect. The initial dosage is set according to the sludge concentration: 5-8 mg/L for low-concentration sludge, 8-12 mg/L for medium-concentration sludge, and 12-15 mg/L for high-concentration sludge. Observe the sludge flocculation effect. If the sludge flocs are small, the dewatered sludge cake is loose, and the moisture content is too high, it indicates insufficient dosage, which needs to be gradually increased. If the flocs are too large, there is excessive reagent residue, and the effluent is turbid, it indicates excessive dosage, which needs to be reduced.

Step 3: Adjust the screw shaft speed. The screw shaft speed should be controlled at 2-3 rpm, initially set to 2 rpm. If the sludge cake moisture content is too high, the speed can be appropriately increased to increase the squeezing force and reduce the moisture content. If the speed is too high, it will cause the discs to wear too quickly and increase energy consumption, so the speed can be appropriately reduced. Simultaneously observe the effluent quality. If the effluent is turbid, it indicates that the speed is too high, and excessive sludge squeezing has led to floc destruction, so the speed needs to be reduced.

Post-adjustment optimization: After parameter adjustment, run the system for 1-2 hours, observe the sludge cake moisture content, effluent quality, and equipment operating status, and make fine adjustments. Ideally, the moisture content of the sludge cake should be controlled below 80%, resulting in clear effluent without significant suspended solids. If sludge blockage occurs during operation, the flocculant dosage can be appropriately increased, the feed rate reduced, and the equipment's self-cleaning function activated.

Sanshine reminds users that the screw press parameter adjustment should follow the principle of "gradual and as-needed fine-tuning," avoiding large-scale adjustments at once. Different water qualities and sludge concentrations require different parameter adaptations, necessitating periodic fine-tuning based on sludge changes to ensure stable dewatering performance and energy-efficient equipment operation.