Case Name: Furniture Factory Paint Spray Wastewater Treatment
Wastewater Issue:
The wastewater contains wood dust particles, toluene, xylene, ethyl acetate, and acetone, with high viscosity. It primarily appears as yellow or colorless and transparent, accompanied by a pungent odor.
Solution:
Use of polyaluminum chloride (PAC) for decolorization and dispersion into small particles, followed by anionic polyacrylamide (PAM) for flocculation and sedimentation.
Treatment Outcome:
In furniture factory paint spray wastewater treatment, oil-based paint wastewater is the most common type. The key to treating such wastewater lies in selecting high-quality PAC and PAM. PAC acts as a destabilizing agent, breaking down and dispersing paint mist in the wastewater, adjusting the pH to neutral, and adsorbing impurities or suspended particles. When PAC is added to the circulating water, its surfactant properties enable penetration, wetting, and dispersion, rapidly breaking down paint particles into fine fragments.
PAM, on the other hand, facilitates the coagulation of paint residues, causing them to float or settle. It aggregates the fine particles into larger flocs, achieving solid-liquid separation. This results in clear water quality, allowing the circulating water to be reused for extended periods without replacement.
In the paint spray wastewater treatment process, anionic PAM is an essential water treatment chemical. It not only eliminates the stickiness of paint residues but also proves highly effective for various types of spray booth circulating water systems. This solution addresses environmental concerns while significantly reducing water usage costs. It is widely applicable to many painting and coating manufacturers, drastically cutting down water replacement and treatment expenses.
Recommendations for First-Time Users of PAM:
For water curtain-type paint spray factories new to PAM, it is recommended to select the appropriate chemical products based on the wastewater's quality, composition, pH, and on-site treatment process. Generally, paint wastewater falls into two categories: oil-based and water-based, each with different compositions and concentrations. Choosing the right chemical and accurately controlling the dosage are crucial for cost-effectiveness.
Objectives of Paint Coagulants in Wastewater Treatment:
Production Support:
Maintain the circulating water's ability to continuously absorb and separate impurities, preventing blockages in pipelines and pumps.
Environmental Compliance:
Meet environmental standards by avoiding the discharge of untreated wastewater, thereby preventing environmental pollution.
