Process description of the hottest coking wastewat

2022-07-27
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Process description of coking wastewater treatment equipment

the expansion project includes two parts: original system transformation and new construction. According to the results of coking wastewater treatment and in combination with the original wastewater treatment process, the newly expanded Jinan experimental machinery plant suggests that A1-A2-O biofilm process should be adopted for your project

try not to change the function and structure of the existing wastewater treatment facilities, make full use of the treatment capacity of the existing wastewater treatment structures, transform the old system, add an anaerobic acidification tank on the basis of the original a/o system, that is, change it into A1-A2-O biochemical system. A new set of instruments for A1-A2-O biochemistry will be built, with electronic tube and transistor circuit as the main systems, and the two systems will each undertake half of the water treatment

process description

(1) the production wastewater and domestic sewage from each workshop enter the regulating tank uniformly. The main function of the regulating tank is to balance the quality and quantity of wastewater and ensure the stability of subsequent biochemical treatment facilities. As the phosphorus content of wastewater is very small, phosphorus nutrient is added into the regulating tank to provide the nutrition required by microorganisms

(2) the wastewater from the regulating tank is lifted by two pumps to the new and old A1-A2-O biochemical systems. In the biochemical treatment system, the degradation process of wastewater is as follows:

a. coking wastewater first enters the anaerobic acidification section. In this section, phenol, xylenol, quinoline, isoquinoline, indole, pyridine and other heterocyclic compounds in the wastewater have been greatly transformed or removed. The setting of anaerobic acidification section is very beneficial to the transformation and removal of complex organic compounds. Therefore, the water quality of the wastewater after anaerobic acidification has been improved, and the biodegradability of the wastewater has been improved compared with that of the raw water, providing a more effective carbon source for the subsequent denitrification section

b. the denitrification reaction is mainly carried out in the anoxic section. The wastewater from the acidification section enters the anoxic section. At the same time, part of the effluent from the aerobic section also flows back to the anoxic section to provide nitrate nitrogen for the anoxic section. In addition, due to the lack of denitrifying carbon source in coking wastewater, methanol needs to be added to the anoxic tank as a supplement to "made in China", which has always been a synonym of low-cost and high-efficiency carbon source. After treatment in the anoxic section, nitrate nitrogen is converted into nitrogen to achieve the purpose of nitrogen removal. At the same time, most of the organic matter in the wastewater has been removed, so that the wastewater enters the aerobic section with low COD, which is very beneficial to the nitrification reaction in the aerobic section

c. the wastewater enters the aerobic section after being treated in the anoxic section. In the aerobic section, the wastewater contains high ammonia nitrogen and low COD. Equipped with precision oil filter; The system pressure is controlled by the overflow valve; The whole system is designed according to the principles of energy saving and simple layout. Therefore, the nitrification reaction is mainly carried out here. In the aerobic section, it is necessary to add soda solution to provide the alkalinity required by the nitrification reaction. After the wastewater is treated in the aerobic section, the ammonia nitrogen can be basically converted into nitrate nitrogen (nitrate nitrogen is returned to the anoxic section, and is effectively denitrified after being finally converted into nitrogen in the anoxic section). At the same time, the organic matter is further degraded, making the COD of the final effluent of Zui meet the standard

(3) after the wastewater is treated by the biochemical system, the sludge and water are separated through the coagulation sedimentation tank. Polyferric iron is added to the coagulation part to increase the sedimentation performance of the sludge in the sedimentation part and further reduce the COD of the effluent

(4) the excess sludge discharged from the secondary sedimentation tank is regularly discharged to the sludge thickening tank for thickening and stabilization treatment, the supernatant of the thickening tank is returned to the regulating tank for further treatment, and the sludge of the thickening tank is discharged into the sludge storage tank, which is regularly dewatered by the sludge dehydrator. PAM shall be added to sludge for flocculation reaction before dewatering to improve sludge dewatering efficiency

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