Waste Treatment Waste is a general problem in chemical plant operation especially in the developing country where the rules and regulations are very strict regarding the waste disposal. A plant takes few raw materials to produce products through several stages of processes for the sole purpose of generating income. But it is not possible to convert all the raw materials into saleable products thus generating unwanted waste or residual.

Waste Streams Stream 3 Stream 15 Stream 18

Waste Stream Properties ParameterStream 3Stream 15Stream 18 WasteIsobutaneOff-gasWater and MAN Type of wasteLiquidGaseous Type of treatment Recycle and storage Recycle, storage, scrubbing, and flare Recycle Molar flow rate (kmol/hr) Temperature ( o C)

Stream 3 (S3)

Stream 15 (S15)

Stream 18 (S18)

Waste Water Treatment The wastewater treatment involves the primary treatment for the solid removing, such as screening and sedimentation. The secondary treatment involves biological or chemical treatment. Tertiary treatment for the nutrient removal. The increase in environmental awareness has pushed the authority to implement strict regulations to limit the release of proven and potentially hazardous materials by chemical plants.

Waste Water Treatment Wastewater ComponentRemoval ProcessLevel of Treatment Oil and Grease (components of wastewater from other sources) Aerated Grit removal Primary Suspended SolidScreening, Aerated grit removal Volatile Organic Compounds: Maleic anhydride, dibutyl phthalate Equalization tank, Clarifier Secondary Acid (H 2 SO 4 ) and Caustic (NaoH) (used for pH adjustment) Clarifier, sludge dewatering Alum Al 2 (SO 4 ) 3 (used as chemical coagulant) Clarifier, sludge dewatering SludgeSludge dewatering Unit (centrifuge), Mechanical Sludge Dewatering (filter press). Treated sludge shall be sent to Kualiti Alam Sdn. Bhd. for disposal. Tertiary