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(1) Treatment of phenol-containing wastewater The phenol-containing wastewater mainly comes from petrochemical plants, gas plants, coking plants, insulating materials plants and other industrial sectors, as well as the production of ethylene from petroleum cracking, synthetic phenol, polyamide fibers , synthetic dyes, organic pesticides and phenolic resins.
Process
.
Phenol-containing wastewater mainly contains phenolic compounds, such as cresol, xylenol, phenol and nitrocresol
.
(2) Treatment of wastewater containing rare earths Wastewater in the production of rare earths mainly comes from rare earth beneficiation and hydrometallurgical processes
.
According to the composition of rare earth minerals and the chemical reagents used in production, the composition of wastewater is also different
.
① Evaporative concentration method
.
The wastewater is directly evaporated and concentrated to recover ammonium salts .
The process is simple, and the wastewater can be reused to achieve "zero discharge".
②Chemical precipitation method
.
Chemical precipitation is generally used in nuclear power and rare earth plants to remove radioactive elements in wastewater
.
③ Ion exchange method
.
The ion exchange resin method is only suitable for the case where the concentration of impurity ions in the solution is relatively small
.
(3) Pesticide production project from the main source of pesticide wastewater treatment
.
Its main features are: complex composition; high toxicity, in addition to pesticides and intermediates, waste water also contains toxic substances such as phenol, arsenic, mercury, and many difficult-to-degrade substances; high pollutant concentration, chemical oxygen demand (COD) ) Can reach tens of thousands of milligrams per liter; smelly, irritating to human respiratory tract and mucous membrane; water quality and volume are unstable
.
(4) Papermaking wastewater treatment Papermaking wastewater mainly comes from the production process of the papermaking industry
.
Pulping is to separate the fibers from plant raw materials into a slurry, and then bleach it; papermaking is to dilute, shape, squeeze, and dry the slurry to make paper
.