Does the yogurt production line require sewage treatment?

Many customers who purchase small yogurt production lines feel that they are not large heavy industry polluting enterprises. If you think so, you are wrong. Because the yogurt production line needs to be cleaned after processing, as long as there is this step, the relevant environmental protection department will detect whether your sewage meets the requirements. If it can meet the relevant requirements?


The discharge of sewage in many countries must comply with certain regulations. For example, there must be an outlet control device in order to continuously measure and record the flow rate of waste water, and to sample in proportion to the flow rate.

The yogurt production line has a system for measuring the flow rate. It is equipped with a venturi measuring tank on the open pipe. For information about the venturi measuring tank and other measuring systems, please contact the municipal sewage treatment management department.

The signal showing the water flow measured in the inclined water tank is switched to the sampling device through the control device. Sampling is based on the preset volume of water (such as 100L) flowing through the flow converter. The water samples of the day must be mixed together, and then a small volume of mixed samples is taken for analysis.

The initial form of sewage treatment is simply to remove large solid impurities by physical sedimentation. When this treatment method cannot meet the requirements, it is supplemented with biological treatment methods in order to decompose organic substances.

When the spread of phosphorus poses a series of problems, many sewage treatment plants use chemical treatment (C) as the third stage of treatment. Because the chemical precipitation stage lags, this type of processing method in the treatment plant is called post-precipitation.

Later experience has proved that the same effect can be obtained if the chemical precipitation is combined with the physical precipitation in the first stage. This system is called pre-precipitation (see Figure 22.3.2).

This method also shows the important rationality of this processing method, because most of the sewage treatment is carried out in one stage. The phosphorus content in the pre-precipitation tank has been reduced by 90%, and the BOD value has also been reduced by 75%.

Many methods are feasible, and the method of treatment depends on the requirements for reducing the degree of pollution.

The various stages of sewage treatment in the yogurt production line can be combined in several ways.

1 after precipitation

The traditional three-stage process has physical part A, biological part B, and chemical part C. This method is effective and reliable, but

Quite expensive.

2 Pre-precipitation

The two-stage treatment method was carried out in the 1980s. The combination of chemical treatment C and physical sedimentation A in the first stage will make

The reduction of advanced phosphorus number reduces the BOD value by 70%, which greatly reduces the load of biological stage B, and the traditional

Compared to settlement, the required settlement volume and energy input are greatly reduced.

3 Direct precipitation

In a single-stage machining process, only the physical part A and the chemical part C are combined. Like the pre-precipitation treatment, only

There is no microbiological treatment stage.

4 Synchronous precipitation

Two-stage treatment, with physical treatment part A, followed by B/C stage of biological-chemical combination, which is a

A fairly cheap and satisfactory method. Without additional increase in expensive settlement volume, it also achieved a reduction in phosphorus value

It is required, but it is inefficient compared to separate biological and chemical methods.

As a result, the biological stage reduces the processing load, requiring only a small settling volume and energy input.