Coal chemical wastewater contains a significant amount of highly toxic washing wastewater, which poses severe risks to human health and the natural environment. Therefore, it is essential to clarify the sources of such wastewater and conduct rigorous Water Quality Testing prior to discharge. The primary objective of these efforts is to ensure the safety of the discharged water. This paper provides a brief overview of key aspects of coal chemical wastewater.

Generation of Coal Chemical Wastewater  

The formation of coal chemical wastewater can be categorized into four main processes:

1.Wastewater generated during coal purification operations;

2.Wastewater produced in the recovery and processing of target substances;

3.Wastewater derived from coal coking and high-temperature processing procedures;

4.Wastewater generated during coal gasification under pressurized conditions.

Harmful Substances in Coal Chemical Wastewater  

The hazardous components in coal chemical wastewater can be analyzed from three perspectives:

1.For high-concentration coal gas washing wastewater (the primary type discharged by enterprises), it contains high levels of toxic substances such as ammonia nitrogen, cyanide, and phenols;

2.Comprehensive coal chemical wastewater is dominated by phenols, nitrogen-containing heterocyclic compounds, and sulfur-containing heterocyclic compounds, and is thus classified as wastewater containing refractory organic pollutants;

3.Easily degradable organic matter in the wastewater primarily includes phenolic compounds and benzene-series compounds.

After identifying the sources and harmful components of coal chemical wastewater, the subsequent workflow involves preliminary treatments (e.g., disinfection and sterilization) followed by the detection of harmful substances using Water Quality Analyzers. Notably, different detection indicators require specific equipment. Currently, single-parameter detection devices remain the mainstream in the market. When selecting equipment, it is critical to first determine the specific parameters of the wastewater and then choose the corresponding detection instruments accordingly.