SAMPLE STOWAGE

To get the best results, samples should be analyzed as soon as possible after they are collected. Some tests, such as DO, temperature, and pH must be performed at the time of collection since the results can change while the sample is being carried to the lab. Some other tests may be delayed if the sample is properly stored. The most common means of preserving a sample is to cool it to 2C to 10C. Table 10-8 shows some ways to preserve the sample.

Table 10-9.-Important Laboratory Tests

IDENTIFYING SAMPLES

After the sample is collected, it should be identified with a label. The label should include the following information:

. Where the sample was taken . The date and time of collection . The type of sample (grab or composite with the appropriate time and volume information)

. Anything that might change before laboratory testing such as temperature, pH, and appearance

. The initials or name of the person who took the sample

SEWAGE TESTING

Laboratory reports are useful in the operation of a wastewater treatment plant. The operator can use laboratory test results to keep the plant working at its best and to give early warning of operating problems. Laboratory testing programs vary with the type of treatment, size of the plant, local water quality requirements, and the NPDES permit requirements. Some of the most common laboratory tests for wastewater treatment plants are shown in table 10-9. They are discussed later in this chapter. Laboratory tests required by NPDES are determined for each treatment plant

Figure 10-1.-Illustrations of laboratory apparatus.

and are cited in the discharge permit. The normal procedures for these tests are given in the Standard Methods for the Examination of Water and Wastewaters and the Methods of Chemical Ana[ysis of Water and Wastes published by the EPA.

[ Back ] [ Home ] [ Up ] [ Next ]

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing