The automatic dosing device for sewage treatment is a piece of equipment used in the sewage treatment system. Its main function is to add chemicals to improve the effect of sewage treatment automatically. This device is usually used in industrial sewage treatment, municipal sewage treatment plants, or other places where large amounts of sewage must be treated.

Through the automatic dosing device for sewage treatment, more accurate, stable, and efficient addition of chemicals can be achieved, improving the efficiency of the sewage treatment system and the quality of treated water. This device helps reduce manual intervention and management costs while improving the stability and reliability of wastewater treatment.

Automatic dosing system working process and structure

The dosing system can be roughly divided into several parts: dissolving, storage, and dosing. The dissolving device is configured according to the nature of the drug, the storage part is configured according to the storage time after the preparation of the drug and the user's actual use and shift arrangement, and the dosing part is selected according to the parameters such as dosing amount, dosing pressure, agent property and dosing accuracy in the process.

Automatic-dosing-system equipment specifications

Difficulties with automatic dosing systems

1.  Nonlinear

1.1 Extreme value characteristics

The characteristic of this type of object is an extreme relationship between the control effect, such as the dosage of chemicals, and the effluent water quality index. That is, the static characteristics of the object are approximately parabolic, and the control effect drifts randomly along the abscissa axis under interference. Conventional fixed value adjustment systems cannot track the drift of the optimal point in real-time.

1.2 Variable coefficient

The static characteristic curve of the object is in a "wavy" shape. For example, the pH change during acid-base neutralization is the most typical. The slope of the curve in a narrow interval with a pH value close to 7.0 is very large so that a small control effect (adding acid or Adding alkali) will cause a large change in the pH value; the same control amount can only obtain a smaller change in the pH value in other test rooms of the characteristic curve. The conventional control mode (PID) often does not achieve the expected results for such control objects. If on-off control (starting and stopping acid-base pumps or on-off valves) is used, it will lead to large fluctuations in the pH value.

2. Hysteresis

The implementation of the water treatment process is usually completed in a large-capacity pool. The control application points are relatively concentrated, and the dosage is often small. After being put into the water body, it gradually spreads out under the combined action of the concentration gradient and external forces such as mechanical stirring and reacts with the substances to be removed. The response time from the injection of chemicals to the basic equilibrium of the reaction is quite long. This hysteresis effect has a great impact on the dynamic quality of the control system and may even cause large fluctuations in control indicators.

This is because the detection element cannot feel the effect of the control immediately, but can only feel the effect of the control exerted some time ago. If the controlled object has obvious hysteresis and its static characteristic curve has severe nonlinearity, it will be difficult to obtain the expected control quality using conventional fixed value adjustment systems.

In addition to the above-mentioned unavoidable difficulties, characteristics such as multi-variables, strong coupling, uncertainty, unobservability, and uncontrollability pose severe challenges to the design and operation of water treatment process automation systems.

Automatic dosing system  parameter table

Model	Configuration addition amount (L/h)	Effective volume (L)	Inlet Pipe	Dosing Pipe	Vent Pip	Overflow	Dimension(mm)			Weight(kg)	Dry powder conveyor (kg)	Mixer(kw)	Power (kw)
							L	W	H
PT500	500	500	DN20	DN20	DN20	DN20	1500	1140	1521	250	0.18	0.37	0.92
PT1000	1000	1000	DN20	DN20	DN20	DN20	2000	1390	1771	505	0.25	0.55	1.35
PT1500	1500	1500	DN20	DN20	DN20	DN20	2000	1390	1771	505	0.25	0.55	1.35
PT2000	2000	2000	DN20	DN25	DN25	DN25	2000	1650	1991	615	0.25	0.55	1.35
PT3000	3000	3000	DN25	DN32	DN32	DN32	2440	1650	1991	685	0.25	0.55	1.35
PT4000	4000	4000	DN25	DN32	DN32	DN32	2550	1010	2136	820	0.25	1.1	3.55
PT5000	5000	5000	DN32	DN40	DN40	DN40	3000	2010	2136	950	0.37	1.1	3.67
PT6000	6000	6000	DN32	DN40	DN40	DN40	3500	2010	2186	1250	0.37	1.1	3.67

Chemical Dosing System outline drawing

1. Bottom frame	2. Polymer preparation tank	3. Dry powder dosing tank	4. Heating machine
5. Mixing motor	6. Screw feeding motor	7. Liquid level switch	8. Vibration motor
9. Solenoid valve	10. Flow meter	11. Electric control cabinet

Product Details

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Effectiveness of equipment

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