Urgent: Wastewater treatment technologies

There is too little information available about this wastewater – only the COD value and pH level are given, which makes it difficult to provide any useful guidance. It is necessary to provide details on the main pollutants present as well as the process by which the wastewater is generated; only then can we assist you. Please provide more complete information.

It’s wastewater containing benzene rings, right? Since benzene rings cannot be broken down through biochemical methods, the COD level doesn’t decrease. Adsorption methods could be considered, using activated carbon or adsorption resins. Mr. Zhang from Xi’an Lanxiao Technology has considerable experience in dealing with this type of wastewater; you can get in touch with him at 13572567263

Such wastewater should first be subjected to ring-opening–oxidation–Fenton oxidation or ozone treatment, among other methods. Regenerative treatment. . . . . . . . The specific plan must be optimized based on the actual conditions of the enterprise.

I also recommend the adsorption method. However, it depends on the composition of the wastewater; if the organic substances contained in it are useful, recovering them through adsorption not only saves resources but also increases their added value. Chemical methods can also be tried, starting with small-scale tests first.

It is recommended to address this issue from the following aspects: 1. First, separate clean water from polluted water, as well as rainwater from wastewater. 2. Then, determine whether the organic substances in the wastewater with high concentrations can be recovered; if not, consider other treatment methods. 3. Based on the water quality you mentioned and the standards for treated water, your requirements aren’t very high; oxidation combined with biological treatment methods should suffice. If that doesn’t work, adsorption can be added as an additional step.

Your condition involves the use of micro-electrolysis as a natural method. Of course, I’m not aware of the specifics of your water quality or the substances responsible for the high COD level. However, based on the pH value, and considering that the COD level is 700 and can be reduced by around 400, using micro-electrolysis should work fine; it’s worth giving it a try.

Micro-electrolysis, also known as internal electrolysis, utilizes the combined effects of the reducibility of iron, its electrochemical properties, and the flocculation and adsorption capabilities of iron ions to purify wastewater. In terms of its treatment principle, it falls under the category of electrolytic methods; hence it is also known as iron-carbon internal electrolysis or iron-carbon micro-electrolysis. Under acidic conditions, numerous micro-current reactors are formed between iron and carbon, and the organic substances in the wastewater are reduced or oxidized under the action of these micro-currents. As the wastewater passes through the filler containing iron and carbon, iron acts as the anode and carbon acts as the cathode; a microcurrent flows, creating countless small batteries that cause corrosion. The relevant reactions are as follows: Anodic reaction: Fe – 2e → Fe2+; E0(Fe2+/Fe) = -0.44 V. Cathodic reaction: 2H+ + 2e → H2 ↑; E0(H2+/H2) = 0.00 V. In the presence of oxygen: O2 + 4H+ + 4e → 2H2O; E0(O2) = 1.23 V. Also: O2 + 4H2O + 4e → 4OH–; E0(O2/OH–) = 0.40 V. Corrosion occurs most severely under acidic conditions with an oxygen supply, and the following effects have been observed: the participation of organic substances in the cathodic reduction reactions leads to changes in the functional groups, altering the properties of the original organic substances, reducing their color intensity, and improving the B/C ratio ； Some inorganic substances also participate in the reactions that result in the formation of precipitates which can be removed; for example, Fe2+ + S2- → FeS. The colloidal particles and finely dispersed pollutants in wastewater are affected by an electric field, leading to electrophoresis – they move toward the electrode with the opposite charge and accumulate there, thereby clarifying the water ； The newly formed Fe2+ at the anode is neutralized by lime to produce Fe(OH)2 and Fe(OH)3, which possess strong adsorption capabilities that enable the water to be clarified ； The hydrogen gas produced at the anode is reducitive; it can reduce *** to aniline, thereby reducing the toxicity of the wastewater and increasing its oxidizability, which facilitates more effective treatment through subsequent oxidation methods.

Micro-electrolysis + coagulation sedimentation + arbitrary aerobic technology (1 hr).

The wastewater is quite acidic; it is recommended to use micro-electrolysis, as this method can both neutralize the acidity and serve a coagulation function. However, when the acidity is very high, a large amount of iron is required, so adjustments are necessary. It would be advisable to conduct some pilot tests first before taking further action