Coking wastewater deep treatment process with three-membrane method and equipment thereof

Abstract

The invention relates to a coking wastewater deep treatment process with a three-membrane method and equipment thereof. The process comprises the following steps that wastewater is led into a coagulating settling pond first, so that COD (Chemical Oxygen Demand) and suspended matters in the wastewater are reduced; secondly, the wastewater is led into a multi-media filter to be further filtered and then is led into a three-dimensional electrode reactor of a fluidized bed to carry out electrocatalytic oxidation; then the wastewater is led into an MBR (Membrane Biological Reactor), and the wastewater from the MBR can be directly used as low-level water; and also, the wastewater from the MBR can continue to depth treatment, the wastewater enters a cartridge filter so that the suspended matters and active sludge in the wastewater are removed, finally the wastewater enters an ultra-filtration device and a reverse osmosis device, the produced water after treatment can be used as high-level water. The equipment is mainly composed of the coagulating settling pond, the multi-media filter, the three-dimensional electrode reactor of the fluidized bed, the MBR, the cartridge filter, the ultra-filtration device and the reverse osmosis device. The process and the equipment have a reasonable design, the problems in the coking wastewater deep treatment and recycling are solved, and the process and the equipment have a stronger engineering application value. The produced water can meet the requirements of different levels of water.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a three-membrane 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 treatm...

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

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