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A Haikou Fine Chemical Co.
, Ltd.
is a chemical pharmaceutical enterprise that produces pharmaceutical intermediate products.
The daily displacement is 20m 3.
The main pollutants in the water are protein , cellulose , xylitol , organic acids and organic chlorides.
The COD is as high as 10000mg/L.
Above, BOD/COD is about 0.
35
.
After scientific and technological research, the company makes full use of the local favorable geography, climate and other natural conditions, adopts anaerobic/contact oxidation/stabilization pond process to treat production wastewater, domesticates special advantageous bacteria, and achieves a COD removal rate of 99.
7%
.
8.
5.
2.
1 Determination of technological process
Chemical and pharmaceutical wastewater has high organic content and contains organic chlorides, which are toxic to aerobic microorganisms, so it is difficult to degrade under natural conditions and seriously pollutes the environment
.
The domesticated anaerobic microorganisms can destroy the long-chain structure of organochlorines, so that the chain will be broken to form smaller molecular substances and then be biochemically degraded
Figure 8-9 Wastewater treatment process
8.
5.
(1) The underground reinforced concrete structure of the regulating pool
.
The size is 4m×3m×4m
(2) Semi-underground reinforced concrete structure of anaerobic tank
.
Up-flow anaerobic sludge bed reactor (UASB) is used
Because the wastewater is difficult to biochemically and toxic, the design considers the local annual average temperature is higher (22～24℃) and operates at room temperature.
A longer hydraulic retention time (HRT) of 8 days is adopted.
The operation results show that the design meets the requirements.
Process requirements
.
(3) The semi-underground reinforced concrete structure of the biological contact oxidation combined pool
.
Biological contact oxidation technology combines the advantages of high sludge activity of activated sludge and high sludge load of biofilm method.
(4) Third-level stabilization pond.
The first-level pond is the original pond and the HRT is 60d, and the average water depth is 2m; the second-level pond is the original pond and the HRT is 33d, and the average water depth is 2m;
.
The stabilization pond is one of the ancient sewage treatment methods, which has a peculiar effect under proper conditions
.
Its water purification mechanism is symbiosis, coexistence, and cooperative work of bacteria and algae; biochemical effects and photosynthesis promote each other
8.
5.
2.
3 Operation effect analysis
The monitoring of the operation effect is entrusted to the relevant environmental protection department for continuous monitoring for 2 days and sampling 3 times a day.
The average value of the 6 samples and the treatment effect of the treatment facilities at all levels are shown in Table 8-13
.
Table 8-13 Monitoring results of chemical and pharmaceutical wastewater
Monitoring and analysis results show that the COD removal rate of the treatment project is 99.
7%, and its main pollutants are degraded in the anaerobic tank.
8.
5.
2.
4 Benefit analysis
Calculated on the basis of 20m 3 of daily drainage , the annual COD discharge to the environment is 72t and the suspended solids is 2t
.
The direct operating cost is 0.
Related Links: Application of Oxidation Pond Sewage Treatment Technology in Changchun Bus Factory
