What are the samp methods for sewage treatment?
(1) Instantaneous speed water sample According to regulations, sample at a certain moment. It is suitable for wastewater whose composition and concentration value change with time and the wastewater treatment equipment (such as advection sedimentation tank) discharges steadily.
(2) For a period of time (according to the management method, usually one day and night or one production cycle), the average mixed water sample will be collected at the same time every time, and then the water sample formed by mixing the evenly-balanced water sample will exceed There are many waste water discharged from production line equipment and equipment with the same characteristics, or waste water discharged from the same machine equipment or equipment with a stable flow but a large water body change.
(3) The average proportion of the mixed water sample is sampled at the same time within a period of time, and then mixed according to the relative flow proportion to form a symmetrical water sample, or within a period of time, when the flow rate is large, take more samples. The flow rate is less than the hour, and then the water sample will be mixed with a well-balanced water sample. It is suitable for water bodies where the flow rate of wastewater, the composition of air pollutants and the concentration value of the water body change regularly. In the treatment of domestic sewage, generally, mixed water samples or average mixed water samples are collected.
(4) Continuous proportion of mixed water samples Under the standard of fully automatic continuous sampler, water samples are continuously collected and mixed according to the proportion of flow for a period of time.
(5) Independent water sample That means independent sampling and independent analysis, and should be sampled and analyzed anytime and anywhere, and if necessary, the water sample should be fixed at the sampling site. Application: Air pollutants are distributed unevenly, such as raw oil, suspended solids, etc.; air pollutants are very easy to change during the whole process, such as dissolved oxygen, sulfate, etc.
When collecting samples in a time-division module, the following new items can only be sampled independently and cannot constitute mixed samples; PH value, COD, BOD, sulfate, dissolved oxygen, organic compounds new items
