Imported fast mixing mixer—Introduction to Chemineer Company
Chemineer, Inc., a subsidiary of Robbins&Myers, Inc., is a world-renowned manufacturer of mixing equipment. The main products include mixers, static mixers, heat exchangers, and high shear homogenization mixing equipment. Keminier products are widely used in chemical, polymer, fermentation FGD、 Industrial fields such as corn deep processing, mining and metallurgy, water and sewage treatment.
In 2013, National Oilwell Huagao Petroleum Equipment (Shanghai) Co., Ltd. acquired the Keminier mixer business, and now the Keminier brand belongs to National Oilwell Huagao Petroleum Equipment (Shanghai) Co., Ltd
Since its establishment in 1952, Keminier Company has been in a good position in the research, design, and manufacturing of mixers and mixers. From simple tank mixing to complex polymerization and fermentation processes, Keminier Company can provide equipment that meets process requirements.

Imported fast mixing mixer- Application field
Keminier products are widely used in industrial fields such as biotechnology, pharmaceuticals, chemicals, polymers, specialty chemicals, fermentation, power plant flue gas desulfurization, deep processing of corn (agricultural products), metallurgy, slurry, energy, food and beverage, papermaking, agriculture, water and sewage treatment, etc.

Imported fast mixing mixer- Performance
Since the establishment of the Shanghai representative office in 1997, we have provided high-quality equipment and comprehensive services to numerous Chinese users, including Suez Water, Veolia, Thames Water, Bishuiyuan, Shanghai Municipal Council, Bailonggang Water Plant, Xingrong Water, Zhongyuan Water, Shenzhen Water, Chongqing Water, Beijing Enterprises Group, Zhongdian Yuanda, Sino French Water, Guozhen, etc.

Imported fast mixing mixer- Water treatment applications
Municipal water treatment facilities utilize continuous mixing to treat municipal drinking water. There are various sources of drinking water, so the water treatment steps are different. The process utilizes rotation and static mixing to treat water for human consumption.
Throughout the entire processing, Chemineer mixers and Kenics static mixers were used to optimize performance, minimize downtime, and keep factory wastewater within acceptable limits. The following is a summary of the application.

Water treatment applications
● Fast/Flash mixer
● Flocculation
● Carbon mixer
● pH control
● Chlorine mixer
Lime mud

Product parameters
Blade form: HE3 (three bladed)
Speed: 4-500 rpm
Blade diameter: depending on the size of the pool body
Axis diameter and axis length: depending on the size of the pool body
Discharge volume: 0-500m ³/min
Material: 304SS/316LSS, carbon steel lined with adhesive, carbon steel lined with FRP
Motor: 0.25-75kw
Reducer: Parallel gear transmission reducer
Gearbox brand: Keminier NORD、SEW、 Sumitomo, Siemens
Motor brands: Nord, Siemens ABB

Imported fast mixing mixer- Application in wastewater treatment industry
● Hypoxia mixer (denitrification)
● Flash/Rapid Blender
● Carbon mixer
● Flocculation
● Sludge mixer/regulation
● Digestive (aerobic/anaerobic)
● Ventilation
● Polymer mixer
Lime mud
● Scum mixer
● Balanced mixer
● Neutralization mixer

overview
The mechanical stirring clarification tank integrates the mixing, flocculation reaction, and sedimentation processes together. At the center of the pool, there is a rotating impeller that mixes the raw water with the added chemicals and the settling sludge from the clarification zone, promoting the formation of larger flocs. The sludge reflux rate is 3 to 5 times the inflow rate. In order to maintain stable suspended solids concentration in the tank, excess sludge should be discharged in a timely manner.

The wastewater enters the annular water distribution triangular groove through the inlet pipe, and the coagulant is added to the water distribution triangular groove through the dosing pipe, and then flows into the mixing zone together to mix water, chemicals, and reflux sludge. Due to the lifting effect of the turbine, the mixed slurry is lifted to the reaction zone, continues the coagulation reaction, and overflows to the diversion zone. The guide plate in the diversion zone eliminates the circular flow from the reaction zone, allowing the waste to enter the separation zone horizontally and steadily along the umbrella shaped cover. The exhaust pipe in the separation zone discharges the air brought in from the wastewater, reducing interference with the separation of sludge and water. The separation zone has a large area, and due to the sudden increase in the water flow area, the flow velocity decreases. The sludge naturally sinks by gravity, and the supernatant flows out of the pool through the collection tank and outlet pipe. A small portion of the sludge enters the concentration zone and is regularly discharged through the sludge discharge pipe, while the majority of the sludge flows back to the mixing zone through the reflux joint under the lifting effect of the turbine.

require
(1) The flow velocity of the inlet pipe is generally around 1m/s. After the inlet pipe is connected to the circular water distribution tank, it circulates water to both sides. The water flow velocity of the water distribution tank and the gap is both 0.4m/s.
(2) The total residence time of water in the pool is generally 1.2-1.5 hours, and the residence time in the second reaction chamber is generally controlled at 20-30 minutes. The flow rate of the second reaction chamber is generally considered to be 3-5 times the water output, and the flow velocity of both the second reaction chamber and the diversion chamber is 60mm/s. The volume ratio of the reaction chamber, the second reaction chamber (including the diversion chamber), and the separation chamber is generally controlled at 2:1:7.
(3) The upward flow velocity of the separation chamber is generally 0.8-1.1mm/s. When dealing with low-temperature and low turbidity water, it should be appropriately reduced, usually 0.7-0.9mm/s.
(4) The water collection method can be submerged L collection tank or triangular weir collection tank. When selecting a submerged hole collection tank, the aperture is 20-30mm, the flow velocity through the hole is about 0.6m/s, the flow velocity in the collection tank is 0.4-0.6m/s, and the flow velocity in the outlet pipe is about 1.0m/s.
(5) According to the size of the clarification tank, there should be 1-3 sludge thickening buckets, with a volume of about 1% to 4% of the total volume of the clarification tank. Small tanks also use only bottom sludge discharge. When the suspended solids content in the inflow is greater than 1 g/L or the pool diameter is ≥ 24m, a mechanical sludge discharge device needs to be installed.
(6) Generally, impeller stirring is used, with the lifting flow rate of the impeller being 3 to 5 times the inlet water volume, the impeller diameter generally being 0.7 to 0.8 times the diameter inside the second reaction chamber, and the outer edge linear velocity of the impeller being 0.5 to 1.5 m/s.

precautions
(1) Check the operation of mechanical equipment when there is no water in the pool. The electrical control system should be operated safely and the mechanical equipment should move flexibly. Simultaneously conduct a beaker test to determine the optimal flocculant and its dosage.
(2) To achieve the required sludge concentration as soon as possible, adjust the inlet water volume to 1/2 to 2/3 of the design value, and make the dosage 1-2 times the normal value, while reducing the lifting amount of the impeller.
(3) Gradually increase the speed and strengthen the mixing after starting to enter the water. If the sludge is loose, the flocs are small, the inlet water temperature is low, or the turbidity is low, an appropriate amount of clay or lime can be added to promote the formation of the sludge layer. Some sludge can also be taken from other operating mechanical mixing clarification tanks and added to a new clarification tank, which can also shorten the time for the formation of the sludge layer.
(4) In the process of sludge formation, try to increase the speed and opening degree as much as possible without disturbing the clarification zone. By adjusting the speed and opening degree, find the optimal combination of speed and opening degree that is suitable for the water quality to be treated. At the same time, samples should be taken regularly to measure the sedimentation ratio of sludge in various parts of the pool. If the sedimentation ratio of sludge in the reaction zone and at the bottom of the pool gradually increases, it indicates that sludge is forming and the operation is about to return to normal.
(5) After the formation of sludge and the turbidity of the effluent reach the design value, the dosage can be gradually reduced to the normal value and the inflow can be gradually increased. The amount of water added each time should not exceed 20% of the design water volume, and the interval between increasing water volume should not be less than 1 hour. After the water volume reaches the design load, it should operate stably for more than 48 hours.
(6) When the height of the sludge surface approaches the outlet of the guide tube, sludge discharge begins and is used to control the sludge surface below the outlet of the guide tube. At this time, the settling ratio of sludge in the second reaction zone for 5 minutes is about 10-20%. Then determine the sludge discharge cycle and duration according to different inlet turbidity, and follow the principle of maintaining the height stability of the sludge surface.

run
(1) If small flocs are found to rise in the clear water layer of the separation zone, causing the effluent quality to become mixed, and the concentration of sludge in the reaction zone becomes lower and lower, and the flocs are also very small when sampled and observed in the first reaction zone, it generally indicates the need to increase the dosage of flocculant or increase the dosage of alkali.
(2) When large flocs appear on the surface of the pool, but the water color between the particles is still very clear, it often indicates that the dosage is too high. The dosage of the medicine can be appropriately reduced and adjusted according to the effluent effect at any time.
(3) When the water content of the sludge discharged from the sludge concentration hopper is found to be low and the sludge settling ratio has exceeded 80%, or when the sludge concentration in the reaction zone rapidly increases and the sludge settling ratio has exceeded 20%, the sludge layer in the separation zone also gradually increases, and the effluent quality begins to deteriorate, usually indicating that the sludge discharge is not enough and the sludge discharge cycle must be shortened or the sludge discharge time extended.
(4) The reason for the appearance of a large number of bubbles in the clear water area at normal temperature is twofold: firstly, the excessive amount of alkali added, and secondly, the poor reflux of sludge in the tank, which leads to the sedimentation of sludge at the bottom of the tank, long-term decay and fermentation, and the formation of large loose humus, which floats to the water surface with gas.
(5) There are several reasons for the significant increase in flocs in the clear water area, which may even cause the pond to overturn. These issues must be addressed in a targeted manner. ① The inlet water temperature is higher than the water temperature in the pool by more than 1 ℃, which reduces the coagulation effect and causes the local upward flow velocity to be much greater than the design upward flow velocity; ② Strong sunlight can cause uneven flow of pool water; ③ The inflow exceeds the design amount, or the water distribution triangle dam is partially blocked, resulting in uneven water distribution and short flow phenomenon; ④ Interruption of medication administration, abnormal sludge discharge, and other reasons.
(6) After the clarifier is shut down for 8~24h, the sludge will be compacted. When the clarifier is re operated, the bottom vent valve should be opened first to discharge a small amount of sludge, and the large water inflow should be controlled and the dosage should be properly increased to loosen the bottom sludge layer. Then, the clarifier should be adjusted to about 2/3 of the normal water volume for operation. After the effluent quality is stable, the dosage should be gradually reduced and the water volume should be increased to the normal value.