Tannery processes are mainly divided into two categories: light leather and heavy leather. When classified by raw materials, they can be divided into pigskin, sheepskin, cowhide, etc. There are various classification methods, depending on actual needs.

Then what about the wastewater generated during tannery production, and how should it be treated?

Wastewater from tanneries is highly polluting and must be disinfected first. Online water quality monitors are then used to detect and analyze various indicators in the wastewater to determine the actual water quality.

Highly polluted wastewater includes degreasing wastewater and chrome tanning wastewater. Although the volume of such wastewater is not large, its pollution load accounts for 80% of the total load. Therefore, it is important to emphasize proper wastewater monitoring to provide an extra layer of protection for water safety.

Tannery wastewater is characterized by complex composition, high suspended solids, high oxygen consumption, and large water volume.

The main monitoring parameters for tannery wastewater are as follows:

1.Suspended Solids (SS)

Mainly include crushed leather, fur, oil residue, large amounts of lime, meat residue, etc.

2.CODcr

A large number of additives are used in leather processing, such as sodium sulfide, ammonium salts, protease, acids, alkalis, and tanning agents, resulting in high COD content.

3.BOD₅

Mainly comes from soluble proteins, blood and other organic substances.

4.Chromium (Cr)

Mainly derived from chrome‑tanning wastewater.

As mentioned above, chromium is a heavy metal. Excessive chromium causes severe water pollution, endangering the ecological environment and human health.

Therefore, the T8000‑Cr  Total Chromium Online Analyzer is used for real‑time monitoring of chromium in water to ensure its concentration does not exceed the standard.