Acid pickling wastewater primarily originates from mechanical cleaning of parts, grinding tools, pickling waste liquids, and cleaning water. Due to its acidic or alkaline nature and high oil concentration, mechanical cleaning wastewater is quite difficult to treat. If directly discharged or improperly treated, it can cause serious environmental pollution, making the treatment of mechanical cleaning wastewater an urgent issue that needs to be addressed.
Why is Acid Pickling Wastewater Difficult to Treat?
The discharge volume of cleaning wastewater is very large, leading to high treatment costs for enterprises. Generally, physical and chemical methods are used for treatment, which have high operational costs and are difficult to manage, often producing large amounts of sludge. However, acid pickling wastewater demulsifiers can easily solve the wastewater discharge problems for enterprises. The method of use is also quite simple:
After collecting the acid pickling wastewater in a water tank, add NaOH to neutralize the wastewater, and then add an appropriate amount of cleaning wastewater demulsifier to separate the oil from the water.
Add a small amount of polyacrylamide for better results. After 5-10 seconds of flocculation and precipitation, add a certain amount of PAC (Poly Aluminum Chloride) and PAM (Polyacrylamide) to promote coagulation and settlement.
The dissolved air flotation (DAF) tank will then cause the sludge in the water to float to the surface, where a sludge scraper will collect the sludge into a screw press for solid-liquid separation. The clear water returns to the circulation tank for continued use.
Cleaning wastewater demulsifiers can effectively separate and remove oil substances from mechanical cleaning wastewater, preventing oil substances from inhibiting subsequent biochemical bacteria. This improves the recycling of wastewater, removes most of the COD (Chemical Oxygen Demand), ammonia nitrogen, and phosphorus, among other pollutants. Additionally, it reduces the land area required for wastewater treatment, lowers the operational costs for enterprises, increases their market competitiveness, and ensures that the wastewater meets discharge standards.
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