-
Anonymous users2024-02-101 .Coagulation and sedimentation method.
Lu Jianhang [1] developed the special coagulant M180 for Baosteel's coking wastewater, which treats the wastewater after biochemical treatment of Baosteel, with the effluent COD at 40 70mg L, the concentration of F- is 50 100 times, the total CN- is about 70%, the average removal rate of each index is about 70%, F- is about 85%, the chromaticity is about 95%, and the total CN- is about 85%.
2.Adsorption method.
The adsorption method is to use porous adsorbents to adsorb one or several solutes in the wastewater to purify the wastewater. The adsorbents commonly used are fly ash, coke quenching powder, activated carbon, resin, etc. Jiang Wenxin et al. [2] used coagulation and sedimentation, activated carbon adsorption and coagulation and sedimentation + activated carbon adsorption processes to carry out advanced treatment of the biochemical effluent of the coking plant, and the coagulation and sedimentation alone or activated carbon adsorption can reduce the COD concentration in the water sample to less than 100mg L, which meets the national first-class sewage discharge standard and the recommended standard for cooling waterFor the biochemical effluent of the coking plant, both the coal-based carbon and the husk carbon showed good adsorption effect, and the effluent COD < 100mg L, but the treatment cost was higher, when the COD was reduced from 147mg L to 100mg L, the cost of using coal-based carbon was yuan m3.
3.Advanced oxidation technology.
1) Fenton oxidation method.
The Fenton reagent method is a homogeneous catalytic oxidation method with hydrogen peroxide as the oxidant and ferrous salt as the catalyst. Fenton's reagent is a strong oxidizing agent that is produced in the reactionOH is a free radical with strong oxidizing ability, which can oxidize organic matter in wastewater, thereby reducing the color and COD value of wastewater.
Xu Haiyan et al. [3] added FINTON reagent to the coking wastewater after biochemical treatment, and then added the flocculant FeCl3 and the coagulant PAM to filter and remove the waste residue, and the COD in the treated water samples was reduced from .
2) Ozone oxidation.
Ozone is a strong oxidant, which can react quickly with most organic matter and microorganisms in wastewater, which can remove phenol, cyanide and other pollutants in wastewater, and reduce its COD and BOD values, and can also play a role in decolorization, deodorization and sterilization. Liu Jinquan et al. [4] used O3, H2O2 O3 and UV O3 to deeply treat the coking biochemical effluent, the contact time was 40 min, the solution pH, and the reaction temperature was 25, under these conditions, the removal rate of COD and UV254 in wastewater could reach up to and , and the COD could be reduced to 67 mg L. Ozone is an efficient and clean oxidant, but ozone generators consume a lot of electricity, have high operating and investment costs, and are used more as disinfection facilities in waterworks, but are less used in industrial wastewater treatment.
-
Anonymous users2024-02-09Or metallic.
Fantasy World Moe wbcd 1 minute ago |Viewed 1 time General Sense of Life Science and Engineering Chemistry.
ARDEX environmental protection industrial cleaning and protection experts pay attention. >>>More
After the steel is soaked in the rust inhibitor, the rust remover penetrates into the steel surface along the cracks of the rust layer and the impurity layer, and dissolves and peels off the rust layer and the impurity layer. A variety of raw materials in this rust remover are adsorbed on the steel surface, rust layer and impurity layer, form diffusion double layer on the solid-liquid interface, because the charge carried by the rust layer and the steel surface is the same, thereby the mutual exclusion effect occurs, and the rust layer, impurities and oxide scale fall off from the steel surface. >>>More
In view of the current situation of the construction site with the demand for steel bar rust removal in China (most of the construction sites are tied up a few years ago or a few months ago), the most suitable rust removal method is to use steel bar rust remover spraying, a good steel bar rust remover does not contain a drop of hydrochloric acid, does not corrode the steel bar, mainly composed of a variety of accelerators, stripping agents, inhibitors, organic acids (phytic acid and edible phosphoric acid), surfactants and other compounds. Through the chemical reactions such as infiltration, absorption, transformation and regeneration of the rust layer on the surface of the steel bar, the rust is transformed into dense zinc iron phosphate composite salt, which is finally solidified into a waterproof and rust-proof neutral high corrosion resistance chemical conversion film (gray-brown), which is firmly solidified on the surface of the steel bar, which can significantly improve the gripping force of reinforced concrete and the adhesion of concrete, and effectively reduce and slow down the rust of steel bars in concrete.
Similar to the cleaning agent you mentioned, the name and model of each factory are different. >>>More
The excellent brands of rust removers include Baotaili, 3M, Chefu, Kuaiermei, Gutwe, Dianbin, Wickart, Kajiayi, Xideyi, Baoneng, etc. This list of derusting machines is based on dozens of data such as brand reputation, sales, and attention index. and analyze it through cloud computing. >>>More