the concentration of pharmaceutical intermediate wastewater is different, in fact, the same method Two pharmaceutical intermediates wastewater treatment case

Two pharmaceutical intermediates wastewater treatment cases
Pharmaceutical intermediates are chemical raw materials or chemical products required for drug production, and the pharmaceutical intermediates required for different drugs are different. So, will the industrial wastewater discharged from different pharmaceutical intermediates be similar? It is even that the same method can be used to treat our pharmaceutical intermediate wastewater.
Pharmaceutical intermediate wastewater is a very typical and difficult to treat industrial wastewater, of which high concentration, poor biochemical properties and high salt content are important labels attached to its head, and it is impossible to get rid of this label. And the two pharmaceutical intermediate wastewater is the same have this write characteristics, but their products are not the same, the discharge of COD concentration and pollutants will be different.
① A pharmaceutical intermediate wastewater has a volume of 120m3/d, which comes from process wastewater, waste gas treatment wastewater, equipment flushing wastewater, etc.. The COD concentration of one of the process wastewater is more than 30,000mg/L, which needs to be done to include the discharge standard of the park - COD<500mg/L.
② The other pharmaceutical intermediate wastewater has a volume of 300m3/d, the source is similar, but its process wastewater COD concentration will be higher, exceeding 60,000mg/L, and the discharge standard is the same.
In fact, they both achieve a stable COD concentration below 500mg/L, using the same method, pre-treatment (iron carbon micro-electrolysis and Fenton oxidation) + biochemical treatment + deep treatment.
Treatment method of pharmaceutical intermediate wastewater
The pretreatment process is required to remove the hard-to-degrade pollutants from the pharmaceutical intermediate wastewater and reduce the concentration of COD, which actually reaches the tolerable range of anaerobic biological treatment.
The process is that the wastewater enters the iron carbon micro-electrolysis and Fenton oxidation units in turn, ① firstly the iron carbon micro-electrolysis unit, which uses the potential difference between the iron carbon particles to form numerous micro-cells to improve the biochemical properties. Then it enters the Fenton oxidation unit, where hydrogen peroxide is added to the Fenton reaction cell, using the strong oxidizing properties of the mixed solution of hydrogen peroxide and iron ions to carry out chemical oxidation pretreatment.

Biochemical treatment is the use of microbial metabolism, and then achieve the purification of pharmaceutical intermediate wastewater, the actual biochemical treatment effluent COD concentration can reach about 250mg/L.

The process is that the biological contact oxidation tank is filled with a certain amount of filler, and the organic matter in the pharmaceutical intermediate wastewater is oxidized and decomposed through biological oxidation by using the biofilm inhabiting on the filler and the sufficient supply of oxygen.
Deep treatment is based on coagulation and sedimentation, or if higher discharge standards are to be achieved, other wastewater treatment processes are added.
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