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Abnormal solution of secondary sedimentation tank and aerobic tank

Abnormal solution of secondary sedimentation tank and aerobic tank
Abnormal solution of secondary sedimentation tank and aerobic tank
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18 professional terms for sewage treatment

18 professional terms for sewage treatment
18 professional terms for sewage treatment
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Detailed explanation of water supply and drainage pipe selection

Detailed explanation of water supply and drainage pipe selection
Glass fiber reinforced plastic sand (RPM) pipe features: 1) Good corrosion resistance. 2) Light weight and high strength. 3) Easy to install. 4) The inner surface is smooth and has high flow capacity. 5) Good low temperature resistance. 6) Good thermal insulation performance.
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DN, De, Dg difference

DN, De, Dg difference
A. Different marking methods for various pipes: water gas transmission steel pipes (galvanized or non-galvanized), cast iron pipes and other pipes, the pipe diameter should be indicated by the nominal diameter DN (such as DN15, DN50); seamless steel pipe, welded steel pipe (straight seam or spiral seam), copper pipe, stainless steel pipe and other pipes, the pipe diameter should be expressed as the outer diameter D × wall thickness (such as D108 × 4, D159 × 4.5, etc.); 3 Reinforced concrete (or concrete) pipes, clay pipes, acid-resistant ceramic pipes , cylinder tile pipe and other pipes, the pipe diameter should be expressed as the inner diameter d (such as d230, d380, etc.); for plastic pipes, the pipe diameter should be expressed according to the product standard method;
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Strategy of Nitrogen and Phosphorus Removal System

Strategy of Nitrogen and Phosphorus Removal System
The current national and local sewage discharge standards for urban sewage treatment plants and water quality standards for reclaimed water use have strict requirements on the nitrogen and phosphorus content of the effluent from sewage treatment plants. However, at present, due to groundwater infiltration or mixed connection of rain and sewage, the concentration of organic matter in the influent of many sewage plants is low. Therefore, it may be necessary to add chemical substances to ensure the normal operation of the denitrification and phosphorus removal system. For example, effective denitrification requires readily biodegradable carbon sources, biological phosphorus removal requires short-chain volatile fatty acids, and in some areas with softer natural water quality, it is necessary to supplement alkalinity to maintain the pH conditions required for the entire aeration tank nitrification process ;Also, if using chemical except
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How to become a pump selection expert

How to become a pump selection expert
1. Basic basis 1. Flow rate is one of the important performance data for pump selection. It is directly related to the production capacity and conveying capacity of the entire device. For example, in the process design of the Design Institute, the normal, minimum and maximum flow rates of the pump can be calculated. When selecting a pump, take the maximum flow rate as the basis and take into account the normal flow rate. When there is no maximum flow rate, usually 1.1 times the normal flow rate can be taken as the maximum flow rate. 2. The lift required by the device system is another important performance data for pump selection. Generally, the head should be selected by enlarging the head by 5%~10%. 3. Liquid properties. Including the liquid medium name, physical properties, chemical properties and other properties, physical properties
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