PCB Wastewater Treatment Introduction
Printed Circuit Board (Referred to as PCB) is Very Difficult for Treatment Owing to Various Pollutants with Complex Components which Contain Wastewater with Multiple Heavy Metals and Organics.
Wastewater Type | Pretreatment Process | Biological Treatment Process |
Comprehensive Wastewater | Before entering the biological treatment, the pH is adjusted with NaOH to generate copper hydroxide precipitation, then removing the precipitation with coagulants and flocculants. | AO+MBR Biological method as the main treatment process of PCB wastewater by microorganisms action, organic matter can be converted into H2O, CO2 and CH4, membrane as a post-processing process of biological treatment, plays the role of mud-water separation with stable effluent water quality, small footprint, operation management boundary, easy to achieve automatic control and other significant advantages. |
Complex Wastewater | Under acidic conditions, iron salts and complexing agents are used to release copper ions, and then the copper ions are removed by coagulation and precipitation before entering the biochemical pond. |
Wastewater with Nickel & Cyanide | Firstly, use the secondary chlor-alkali method to break the cyanide, then adjust the wastewater pH to11 to remove the precipitate of nickel hydroxide after it is produced. |
Organic Wastewater | The waste acid is used for acid extraction, after the solid formation is taken out, then mixed it with organic wastewater for treatment. Organic wastewater contains complexed copper, which needs to be treated by breaking the complex and removing copper to form insoluble precipitation from free copper ion under alkaline condition before removing it and discharging it into biochemical system. | The pre-treated wastewater is firstly hydrolyzed and Acidified in the Biochemical Pit, the macromolecular organic matter is decomposed into small molecular organic matter to improve the biodegradability of the wastewater |
PCB Wastewater Treatment Project-Process Flow
Technical Features
Completely destroy the chelating agent & complexing agent in complexation waste water to make them permanently lose the force of chelate and complexing by biological treatment technology with decomposing enzyme of microbial anaerobes.
The Process of “Acidification - Anaerobic - Dosing Activated Sludge " to treat PCB organic wastewater with good effect and economical technology for removing COD, copper ion and ammonia nitrogen.
Wastewater Reuse Process: Pretreatment +RO System, Effluent Conductivity 100 ~ 150s.
PCB Wastewater Treatment Project-Performance
The Corrugated Membrane Units has been running for one year with stable flux at 15LMH without attenuation on both side of the left and right, and no obvious mud accumulation when it is finally lifted out for inspection. Although the surface of the membrane unit is red due to iron ions influence, there is no serious fouling.
The cleaning frequency keeps around once every three weeks with acid and alkali cleaning, and the recovery effect after cleaning is better.
