過(guò)硫酸鈉為強(qiáng)氧化劑，可用作氧化劑，可將Cr3+、Mn2+等氧化成相應(yīng)的高氧化態(tài)化合 物，當(dāng)有Ag+存在時(shí)，可促進(jìn)上述氧化反應(yīng)；利用其氧化性可用作漂白劑、金屬表面處理劑、化學(xué)試劑；醫(yī)藥原料；電池、乳液聚合反應(yīng)的促進(jìn)劑和引發(fā)劑。如活化過(guò)硫酸鈉可用于原位修復(fù)石油類污染土壤的工程，過(guò)硫酸鈉可以在未受污染的土壤環(huán)境中穩(wěn)定存在，在純砂石含水層中過(guò)硫酸鈉可以穩(wěn)定存在達(dá)2 年之久，如果含水層土壤中含有2%的Fe( Ⅲ) 或Mn( Ⅳ) ，則過(guò)硫酸鈉可以存在1 年。
Sodium persulfate is a strong oxidant and can be used as an oxidant. It can oxidize Cr3+, Mn2+, etc. into corresponding high-oxidation compounds. When Ag+is present, it can promote the above oxidation reaction; It can be used as bleaching agent, metal surface treatment agent and chemical reagent by using its oxidizing property; Pharmaceutical raw materials; Promoter and initiator for battery and lotion polymerization. For example, activated sodium persulfate can be used for in-situ remediation of petroleum-contaminated soil. Sodium persulfate can be stable in the uncontaminated soil environment, and sodium persulfate can be stable in the pure sand aquifer for up to 2 years. If the aquifer soil contains 2% Fe (Ⅲ) or Mn (Ⅳ), sodium persulfate can exist for 1 year.
如果土壤中含有較多的鐵、錳氧化物，或者土壤性質(zhì)為黏土，過(guò)硫酸鈉的半衰期會(huì)縮短幾天。但是未活化過(guò)硫酸鈉在低滲透性土壤中也有較好的修復(fù)效果，如經(jīng)過(guò)240 d 監(jiān)測(cè)模擬裝置中過(guò)硫酸鈉的傳輸和擴(kuò)散情況，結(jié)果95%—99%的苯系物被去除。
If the soil contains more iron and manganese oxides, or the soil is clay, the half-life of sodium persulfate will be shortened to a few days. However, unactivated sodium persulfate also has good remediation effect in low permeability soil. For example, after 240 days of monitoring the transmission and diffusion of sodium persulfate in the simulation device, 95% - 99% of the benzene series were removed.
過(guò)硫酸鈉會(huì)和土壤中的還原性物質(zhì)發(fā)生反應(yīng)導(dǎo)致修復(fù)效率的降低，這些還原性物質(zhì)包括：有機(jī)質(zhì)；含F(xiàn)e( Ⅱ) 礦物，如云母、閃石、輝石、黃鐵礦、菱鐵礦等；含Mn( Ⅱ，Ⅲ) 礦物，如菱錳礦、黑錳礦等；含S( Ⅰ、Ⅱ) 礦物，如黃鐵礦、四方硫鐵礦等；含As 及Cr( Ⅲ) 礦物等。更進(jìn)一步指出有機(jī)質(zhì)、含鐵、錳、硫等礦物為主要還原性物質(zhì)。
Sodium persulfate will react with reducing substances in the soil, which will reduce the remediation efficiency. These reducing substances include: organic matter; Fe (II) containing minerals, such as mica, amphibole, pyroxene, pyrite, siderite, etc; Containing Mn (II, III) minerals, such as rhodochrosite and black manganese ore; Containing S (I, II) minerals, such as pyrite, tetragonal pyrite, etc; Containing As and Cr (III) minerals. It is further pointed out that organic matter, iron, manganese, sulfur and other minerals are the main reducing substances.
目前已有多家國(guó)外企業(yè)開發(fā)了用于原位土壤修復(fù)的過(guò)硫酸鈉試劑( Regensis 公司的Persulf Ox、FMC 公司的Klozur Persulfate、PermeOx Ultra 和Klozur CR、EthicalChem 公司的S-ISCO，
At present, many foreign enterprises have developed sodium persulfate reagents for in-situ soil remediation (Persulf Ox of Regensis, Klozur Persulfate, PermeOx Ultra and Klozur CR of FMC, S-ISCO of EthicalChem,
公司的VeruSOL 等) ，這些一體化的修復(fù)試劑由過(guò)硫酸鈉、過(guò)氧化鈣、氧化鈣、Fe 粉、含鐵化合物、生物表面活性劑和助溶劑等組成。可以在注入到污染區(qū)域后自活化產(chǎn)生自由基，減少了后續(xù)活化劑的注入和污染物的遷移。這些試劑已經(jīng)被成功地應(yīng)用于實(shí)際石油類污染土壤原位修復(fù)工程中，得到了較好的去除效果。
VeruSOL, etc.), these integrated repair reagents are composed of sodium persulfate, calcium peroxide, calcium oxide, iron powder, iron-containing compounds, biosurfactants and cosolvent. It can self-activate and generate free radicals after injection into the contaminated area, reducing the injection of subsequent activator and the migration of pollutants. These reagents have been successfully applied to the actual oil contaminated soil in-situ remediation project, and have achieved good removal effect.
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