Inbrewery wastewater treatment, the selection and application ofpolyacrylamide(PAM) significantly impact treatment efficiency and operational costs. Below is a detailed analysis of PAM selection and performance based on brewery wastewater characteristics.

1. Characteristics of Brewery Trash

Contentus organic altus: Rich in saccharis, proteins, et starches (high COD/BOD).

Suspendentes solidos (SS): residuos fermentorum, fibros frumentorum et particulas colloidales.

Variabile 水质 (pH 4–6): Fluctuations due to brewing, fermentation and cleansing processes.

High biodegradability: Suitable for biological treatment but requires pretreatment to reduce organic load.

2. Factores claves in selectione PAM

(1) Selection Ionic Type

Cationic PAM (CPAM)

Application: Sludge dewatering (e.g., after activated sludge process).

Functio: Neutralizes negativo charged colloids, improves pulchritudinem, and reduces moisture content (to ≤80%).

Recommendatus est: densitate medium-high charge (60–80%), pessima molecula (MW) 8–12 million.

PAM Anionic (APAM)

Application: sedimentatio primaria (pretreatment for SS removal).

Functio: Bridges particulas suspendentes via adsorption, formant flores magnos.

Recommendatus est: MW medium-high (10–15 million), 10–30% hydrolysis.

Non-ionic PAM (NPAM)

Aplicatio: Conditiones Neutralis aut fluctuationis pH, aut quando ions metallis sunt.

Functio: Relationes super ligamentum hydrogenum; - saepe cum coagulantibus (ex. PAC).

(2) Molecular Weight (MW) Selection

High SS wastewater: High MW (≥15 million) for better bridging.

Soluble organics: Lower MW PAM may assist coagulation.

(3) Dosage & Mixing

Dissolutio: 0.1–0.3% solutio cum gentilis stirritione (evade degradationem tunicam).

Dosage: 1–10 ppm (determined via jar testing).

3. Treatment Performance Comparison

  Parametrus                                  - APAM (Pretreatment)                  CPAM (Sludge Dewatering)

Removing COD                                  30–50% (cum PAC)                gradient-editor-action

SS Removal                                              70–90%                                                –

Sludge Cake Moisture                                                    –                                          75–80%

Velocitate                                  Significantly improved              Increased compressibility

4. Key Considerations

Jar Testing: Essential due to wastewater variability.

pH Adjustment: Optimal PAM performance at pH 6–8 (lime may be needed for acidic wastewater).

Safety: Ensure acrylamide monomer content ≤0.05% (regulatory compliance).

Costa-Benefit: CPAM carior est, sed efficabilitatem dewateris melior est.

5. Processus Treationis Typicalis

Flow: Screening → Equalisatio (pH adjustment) → PAC + APAM coagulation → UASB/Aerobic Process → CPAM sludge dewatering.

Selecting the appropriate PAM type, breweries can enhance wastewater treatability, improve sludge handling and reduce disposition costs.