Oxidation method Oxidation method can control the soluble sulfide in sewage and prevent the generation of hydrogen sulfide. The simplest and most effective method is to increase the Do value in the sewage, because when Do10mg / L, sulfide will not be generated.
Oxidation methods often include the following:
(L) Ventilation and oxygen supply Ventilation and oxygen supply is an economical and practical method (generally injecting air into the air). Through oxygen supply, the Do value in sewage is increased to prevent the generation of hydrogen sulfide. The advantage of this method is that the equipment is simple and the operation is convenient; the disadvantage is that it causes turbulence.
(2) Adding hydrogen peroxide (HZ02) HZOZ is a strong oxidant, which can oxidize sulfide in sewage. The dosage of medicament is generally 1-5kgHZ Wu / kg from S. HZoZ dosing equipment is relatively simple, mainly composed of storage vessels and metering pumps.
(3) Dosing potassium permanganate (KMnO4) KMno4 is also a strong oxidant, and its mechanism of action is similar to HZOZ. Potassium permanganate powder is generally sold on the market. When it is added to sewage, it must be formulated into a 6% solution. However, the price of configuration and dosing equipment is very high, so the method of dosing potassium permanganate is used less.
(4) The addition of chlorine and chlorine can oxidize the sulfide in the sewage into sulfate or elemental sulfur, which mainly depends on the pH value in the sewage. The dosage of medicine is generally 10-15kgC12 / kgHZS. LZ precipitation method The precipitation method is to add a metal salt solution, so that the metal ions and S in the sewage chemically react to form insoluble metal sulfide. Iron salts (FecIZ and Feso4) are usually added, and the dosage of the agent is generally 4-15kgFeC12 / kgHZS.
Raising the pH value Raising the pH value in the sewage can prevent the generation of hydrogen sulfide. The method is to continuously add NaOH, but this is expensive, and it may interfere with the normal operation of downstream sewage treatment plants. A more economical and convenient method is to attract some alkaline wastewater in the sewage pipe, so as to increase the pH value.
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