Q&A-Yuanlai Water Treatment-第20页

Q&A

14 Oct
Factors affecting coagulation effect

The factors influencing the coagulation effect include: (1) water temperature; At low temperatures, the coagulation effect is poor and the coagulation is very slow. At that time, due to the endothermic reaction of inorganic salt coagulants during hydrolysis, hydrolysis is very difficult when the water temperature is low. Secondly, in low-temperature water, the annual temperature is large, and the thermal motion of impurities in water is slow, reducing the chance of batch contact and collision, which is unfavorable for mutual coagulation. When the viscosity of water is high, the shear force of water flow increases, and the growth of flocs is hindered. Therefore, the coagulation effect is poor when the water temperature is low. When the water temperature rises, the diffusion rate between molecules accelerates, which is conducive to the progress of coagulation reactions. The usual temperature is 20 to 29 degrees Celsius. (2) The pH value and alkalinity of water and their influences Excessively high pH value and alkalinity can also affect the coagulation effect. (3) The influence of the composition, nature and concentration of impurities in water &

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13 Oct
Why is it necessary to control head loss?

Head loss refers to the pressure of water passing through the filter layer. Head loss is one of the indicators often used to determine whether a filter needs to be flushed. When the head loss of the filter reaches a certain value during operation, it should be shut down and backwashing should be carried out. The reasons why the filter cannot be operated with excessive head loss are as follows: (1) When the head loss is large, the pressure during the filtration operation increases, which easily leads to the rupture of the filter layer and the occurrence of cracks in certain parts of the filter layer. At this point, most of the water passes through the crack, creating a short circuit in the water flow and disrupting the Bob filtration effect, thereby affecting the water quality. (2) Head loss is related to the impurity content in the filter layer. If the investment loss is too large, it indicates that there are too many impurities in the filter layer, which will cause the filter material to clump and be difficult to clean thoroughly during backwashing and other adverse consequences. In addition, each part of the filter layer equipment is designed according to a certain pressure and cannot

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12 Oct
Calculation methods for the regeneration of boiler softened water equipment and solutions for you

Calculation method for flow regeneration of boiler softened water equipment and calculation method for regeneration cycle: 1. Inlet and outlet water quality of boiler softened water: Inlet water hardness: 6.0mmol/L. Effluent hardness: 0.03mmol/L. Ii. Parameters of Boiler Softened Water Equipment: Water production capacity: 0.2-0.5T/h. Resin content: 25L. Resin tank: Φ200× 1200. Salt tank: 25L. Iii. Calculation Process of Boiler Softened Water. 1. Calculation parameters for boiler softened water. The volumetric total exchange capacity of the resin: ≥ 1900mmol/L. (Zhejiang Zhengguang General Resin: 001×7) The working exchange capacity of the resin: ≥ 1200mmol/L.

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12 Oct
Types and advantages and disadvantages of filter tanks

The applicable conditions, advantages and disadvantages of several commonly used types of filters are as follows: (1) Conventional rapid filters and double-layer filters are suitable for influent turbidity less than 20NTU, and can be less than 50NTU in the short term. It is used in large, medium and small water treatment plants, and the area of a single pool is generally no more than 100 square meters. The operation and management of the common rapid filter tank is convenient, but it has many valve components and is prone to leakage, so a dedicated flushing device is required. The double-layer filter has a high filtration rate and a long working cycle, and can be transformed from a common rapid filter. However, the selection of filter materials is strict, the flushing operation is rather strict, and it is prone to sludge sedimentation. (2) Contact double-layer filter, which is direct filtration, is suitable for small-scale water treatment plants with a capacity of less than 5000m ³ /d, and the influent turbidity requirement is less than 150NTU. Its advantages are that it can purify raw water at one time, requires fewer treatment structures, occupies less land, and has low infra

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08 Oct
Selection criteria for laboratory ultrapure water machines

The selection of a laboratory ultrapure water machine mainly depends on the quality of the raw water, the amount of water used, and the quality of the water used. There are three types of water quality for national laboratory standards: Grade one water, Grade Two water, and Grade Three water. However, most laboratories only need two types of water quality. The first is Grade three water, such as distilled water, which is used for cleaning glassware, etc. The second type is grade one water, which is mainly used for chemical analysis or precision instrument analysis such as liquid chromatography and atomic absorption. Customers should select the grade of the ultrapure water machine based on their actual water quality requirements. All ultrapure water machines that use tap water as the water source have two (two types of water quality) outlets. One is pure water, that is, grade three water. The second type is grade one water, namely ultrapure water (strictly speaking, the resistance of grade one water is greater than 10MΩ.cm, while that of ultrapure water is greater than 18MΩ.c)

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