Sewage dosing pretreatment system

Abstract

The invention discloses a sewage dosing pretreatment system which comprises a sewage collecting tank, the sewage collecting tank is connected with a first dosing pipeline and a second dosing pipeline, the first dosing pipeline is provided with a first delivery pump and a first pipeline mixer, and the second dosing pipeline is provided with a second delivery pump and a second pipeline mixer. A first upstream control valve and a first downstream control valve are arranged on the first dosing pipeline; the second dosing pipeline is provided with a second upstream control valve and a second downstream control valve; the downstream sections of the first dosing pipeline and the second dosing pipeline are converged and connected to the main conveying pipeline, a series branch is arranged between the outlet of the first conveying pump and the inlet of the second conveying pump or between the inlet of the first conveying pump and the outlet of the second conveying pump, and a branch control valve is arranged on the series branch. The dosing pretreatment system not only can be maintained without shutdown, but also can increase conveying power when high-power conveying is needed, so that the cost is reduced.

Description

technical field [0001] The invention relates to a sewage dosing pretreatment system, which is used for sewage pretreatment. Background technique [0002] In the current field of sewage treatment technology, after the sewage enters the sewage collection tank, it needs to be pretreated before it can be sent to the downstream clarification tank for sedimentation. The current treatment system is to add PAC and PAM during the transportation process to make the sewage The particulate sludge in the clarifier accelerates sedimentation in the clarifier. However, this pretreatment system still has the following disadvantages: 1. The mixing of the added PAC and PAM is not uniform enough, which requires an increase in dosage, resulting in an increase in cost; 2. The delivery power of the current pretreatment system is carried out by a delivery pump However, the power of the delivery pump is fixed, so in order to meet the special delivery requirements, the power of the delivery pump wil...

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Problems solved by technology

However, this pretreatment system still has the following disadvantages: 1. The mixing of the added PAC and PAM is not uniform enough, which requires an increase in dosage, resulting in an increase in cost; 2. The delivery power of the current pretreatment system is carried out by a delivery pump However, the power of the delivery pump is fixed, so in order to meet the special delivery requirements, the power of the delivery pump will have a certain margin, so it is necessary to choose a delivery pump with a higher power, which will further increase the cost; 3. At present, the transportation of the pretreatment system is just a simple transportation pipeline. Once the transportation pump fails, the transportation can only be shut down, thereby affecting the treatment efficiency of sewage, which has caused very large economic losses for the sewage treatment plant.

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