A typical problem commonly occurs in smelting wastewater treatment sites: the effluent looks clear without obvious turbidity or impurities, but the detection values of heavy metals such as copper, lead, nickel, zinc and cadmium in the water are unstable with intermittent excess standards. As a professional advanced heavy metal removal technology, our solution effectively solves such common pain points in smelting sewage treatment, including slight color reversion and residual fine suspended solids in effluent.
This water quality problem brings many hidden dangers to the environmental protection and production of enterprises. Traditional water treatment processes fail to stably meet the discharge standard with frequent water quality fluctuations and low fault tolerance. It not only increases the operation and maintenance difficulty of sewage treatment, but also exposes enterprises to long-term risks of unqualified environmental sampling inspection, rectification and penalty, seriously affecting normal production and operation.
The root cause lies in the two existing forms of heavy metals in smelting wastewater and the limitations of traditional treatment processes. Heavy metals in smelting wastewater are divided into free state and complex state. The conventional chemical precipitation method by adjusting pH with alkali only works for free-state heavy metals to form hydroxide precipitates for removal. However, it cannot break the metal coordination bonds of structurally stable and tightly bound complex heavy metals, resulting in residual complex heavy metals and repeated excessive standard problems.
Targeting different forms of heavy metals in smelting wastewater, Shanmei provides a complete precise capture treatment solution based on the principle of "treatment according to different forms". Firstly, oxidation processes such as Fenton oxidation, sodium hypochlorite oxidation, electrolysis and ozone/UV oxidation are adopted for complex breaking pretreatment to break the coordination bonds of complex heavy metals and convert stable refractory complex heavy metals into treatable free-state heavy metals. Then, a special heavy metal scavenger is dosed. Essentially, the scavenger uses sulfhydryl groups to undergo chelation or precipitation reactions with metal ions to quickly capture heavy metals including copper, lead, nickel, zinc and cadmium and form stable insoluble chelates. Finally, PAC and PAM are added for flocculation and precipitation to realize efficient solid-liquid separation and completely remove various heavy metal pollutants in water.
This complete solution features strong compatibility and requires no transformation of original sewage treatment equipment and processes, with simple implementation and controllable costs. It can completely remove both free-state and complex-state heavy metals, thoroughly solving problems such as excessive heavy metals, water turbidity, color reversion and data fluctuation. The final effluent is clear and transparent with long-term stable and qualified heavy metal detection values. No secondary pollutants are generated during the treatment process, ensuring strong working condition adaptability and stable treatment effect.
To further optimize the treatment effect and reduce enterprise operation and maintenance costs, the dosage and proportion of chemicals can be finely adjusted according to real-time fluctuations of raw water quality and heavy metal concentration to optimize the overall treatment process and form standardized workshop operation procedures. Meanwhile, the treatment process can be regularly calibrated combined with seasonal water quality changes to continuously optimize the water treatment effect and ensure long-term stable discharge compliance of wastewater.
Struggling with difficult complex heavy metals, repeated exceedance and unstable water quality in smelting wastewater? No process or equipment modification needed. Contact us for free water testing and dosing solutions to achieve stable compliance.Email: info@san-mei.com
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