With the improvement of living standards, the requirements for environmental quality have been increasingly stringent. Relevant authorities have formulated specific regulations regarding the discharge of wastewater from chemical manufacturing enterprises. After disinfection and sterilization, various water quality indicators should be tested using water quality analyzers to verify whether the treatment outcomes meet the required standards. Only upon confirmation of compliance can the treated wastewater be discharged. This paper provides a brief overview of the classification of coal chemical wastewater and the associated treatment technologies.
For coal chemical enterprises, water serves as a primary medium throughout most production processes, leading to the generation of large volumes of chemical wastewater. This wastewater contains a diverse range of pollutants, including suspended solids, ammonia nitrogen compounds, oil contaminants, sulfur-containing compounds, and cyanide. In alignment with the current landscape of environmental protection policies, achieving zero wastewater discharge has become a critical objective for coal chemical wastewater treatment. However, practical challenges such as difficulties in balancing wastewater treatment systems and significant fluctuations in wastewater quality necessitate in-depth research into coal chemical wastewater treatment technologies.
Coal chemical wastewater can be broadly categorized into two main types: salt-laden wastewater, which exhibits a high concentration of dissolved salts, and organic wastewater, which is characterized by high COD (Chemical Oxygen Demand) levels but relatively low salt content. The composition of pollutants in organic wastewater varies depending on the specific coal chemical production processes employed.
What Treatment Technologies are Applicable for Coal Chemical Wastewater?
Currently, the mainstream treatment technologies for coal chemical wastewater include pretreatment, biochemical treatment, and advanced treatment processes. The selection of a specific technology depends on the particular circumstances. For instance, coal chemical wastewater often contains high concentrations of ammonia nitrogen, elevated COD levels, and recalcitrant organic compounds. In such cases, conventional biochemical treatment processes may fail to yield satisfactory results. Therefore, optimization of microbial strains and reactor configurations is required. Additionally, post-biochemical advanced treatment must be implemented until the pollutants in the wastewater are effectively removed. Notably, online water quality monitoring is an integral component of the wastewater treatment process.
