Coking wastewater

Coking wastewater:
1. Source:
Coking wastewater is industrial wastewater containing volatile phenols, polycyclic aromatic hydrocarbons, oxygen, sulfur, nitrogen and other heterocyclic compounds produced during high-temperature carbonization, purification and by-product recovery of coking and coal gas. It is a kind of high CODcr, high phenolic value, high An industrial organic wastewater that contains ammonia nitrogen and is difficult to treat. There are three main sources: first, residual ammonia, which is wastewater produced during coal carbonization and gas cooling. Its water volume accounts for more than half of the total coking wastewater and is the main source of coking wastewater; second, during the gas purification process The waste water produced is, for example, gas final cooling water and crude benzene separation water; the third is waste water produced in the refining process of tar, crude benzene, etc. and other occasions.

2. Characteristics of coking wastewater:
The pollutants contained in coking wastewater include phenols, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, and sulfur. It is a typical industrial wastewater containing organic compounds that are difficult to degrade. The easily degradable organic compounds in coking wastewater are mainly phenolic compounds and benzene compounds. Pyrroles, naphthalenes, furans, and azoles are degradable organic compounds. Refractory organic compounds mainly include arsine, carbazole, biphenyl, terphenyl, etc.

3. Wastewater treatment methods:
At present, there are many ways to treat coking plant wastewater. The primary way is to comprehensively consider coking wastewater treatment. If you choose a plant site when building a plant, you should demonstrate the wastewater treatment plan, fully consider the upstream, downstream and surrounding conditions of the plant site, and do not locate it near the water supply source or in a place with special requirements; whether the treated water can be sent to a nearby coal washing plant , comprehensive wastewater treatment plants in steel plants, and urban sewage treatment plants, making the wastewater treatment plan more reasonable is also an issue that must be considered.
Secondly, wastewater treatment cannot be considered alone, but the design plan should be considered together with the gas purification process. Starting from the device that generates wastewater, each process is designed according to requirements to reduce the burden on the final wastewater treatment device.
Try to use the treated wastewater within the plant as much as possible, such as sending it as coke quenching supplementary water, dust removal supplementary water, coal yard water sprinkling, etc., thereby reducing the amount of external drainage, and taking measures to prevent adverse effects on the environment and equipment.