Coupling type coking wastewater advanced treatment process and coupling type coking wastewater advanced treatment device

Abstract

The invention discloses a coupling type coking wastewater advanced treatment process and a coupling type coking wastewater advanced treatment device. The process is as follows: wastewater is introduced into a mixing-sinking tank, so that COD (Chemical Oxygen Demand) and suspended matters in the wastewater can be reduced, secondly, the wastewater is introduced into a multi-media filter to be further filtered, then the filtered wastewater is introduced into a three-dimensional electrode reactor of a fluidized bed to be subjected to electrocatalytic oxidation, and then is introduced into an MBR (Membrane Bio-Reactor), then the wastewater discharged from the MBR can be directly used as low-level water, and also the wastewater can continue to be subjected to the advanced treatment, and enters a cartridge filter, so that the suspended matters and activated sludge in the wastewater can be removed, and finally the wastewater enters a reverse osmosis device, and the treated produced water can be in the high-level. The device mainly comprises the mixing-sinking tank, the multi-media filter, the three-dimensional electrode reactor of the fluidized bed, the MBR, the cartridge filter and the reverse osmosis device. According to the process and the device, the design is reasonable, the difficulties of the advanced treatment and the reuse of coking wastewater can be solved, the engineering application value is extremely strong, and the produced water can meet the requirement of different levels of water.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a coupled coking wastewater advanced treatment process and equipment thereof. Background technique [0002] Coking wastewater is a kind of industrial wastewater that is recognized as difficult to biodegrade. The difficulty lies in the poor biodegradability of the wastewater. In addition to inorganic pollutants such as ammonia, cyanide and thiocyanate, it also contains heterocyclic rings such as phenols, naphthalene, pyridine, and quinoline. and polycyclic aromatic compounds (PAHS) and other substances that are difficult to biodegrade. These substances can have long-term effects on the environment, and some of them have been confirmed as carcinogens by research. In addition, high concentrations of ammonia nitrogen have a strong inhibitory effect on microbial activity. The effect of biological denitrification is not good. Currently, coking wastewater treatment sys...

AI Technical Summary

Problems solved by technology

Due to the high cost of further advanced treatment, many domestic coking plants are discouraged, so most coking wastewater is directly discharged after conventional two-stage treatment

However, after the above treatment, some toxic and harmful substances (cyanide, COD and heterocyclic compounds, etc.) in the wastewater still cannot meet the discharge standards allowed by the state.

[0003] At present, the outstanding problems in the advanced treatment process of coking wastewater are as follows: first, the advanced treatment of wastewater by chemical agents may introduce secondary pollution, or increase the cost of subsequent desalination; second, the use of coking wastewater for wet quenching coke or blast furnace slag, but the pollutants in the wastewater have been transferred, and the operating environment is poor, and there are problems such as pipe network and equipment corrosion; third, the whereabouts of the concentrated water after the advanced treatment of membrane desalination is also an urgent problem to be solved

Images