22.5 KLD FRP Package Sewage Treatment Plant (STP) Technical & Commercial Proposal

Vocabulary flashcards covering the key engineering terminology, technical specifications, treatment stages, and commercial terms from the Shams Engineering STP proposal.

MBBR (Moving Bed Biofilm Reactor)

A wastewater treatment technology utilizing suspended carrier media within an aerated biological reactor to support non-blocking fixed-film biomass for organic pollutant removal.

FRP (Fiber Reinforced Plastic)

The structural composite material specified for constructing the horizontal cylindrical tank body of the $22.5\,\text{KLD}$ package sewage treatment plant.

Aqua Nishihara

The Thailand-based equipment manufacturer and brand supplying the imported integrated MBBR package sewage treatment plant.

Inlet Bar Screen with Jet Cleaning System

A preliminary screening unit sized at $600\,\text{mm} \times 600\,\text{mm}$ equipped with a lever-operated spray gun, brass nozzle, and a $3\text{--}5\,\text{m}$ hose pipe operating at $40\text{--}60\,\text{psi}$ ($2.8\text{--}4.0\,\text{bar}$) to catch and flush coarse solids.

Raw Sewage Inlet Parameters

The baseline design characteristics of untreated influent to the STP: pH $6.5\text{--}8.5$, BOD $< 250\,\text{ppm}$, COD $< 400\,\text{ppm}$, TSS $< 200\text{--}250\,\text{ppm}$, and Oil & Grease $< 10\,\text{ppm}$.

Treated Effluent Outlet Parameters

The guaranteed discharge limits achieved by the STP: pH $6.5\text{--}8.5$, BOD $< 50\,\text{ppm}$, COD $< 250\,\text{ppm}$, TSS $< 20\,\text{ppm}$, and Oil & Grease $< \text{Traces}$.

Solid Separation Tank (T03)

The first compartment within the FRP package unit designed for preliminary mechanical gravity settling and solid-liquid separation.

Fixed Film Aeration Tank (T04)

An aerobic chamber within the FRP unit equipped with fixed media where attached microorganisms oxidize dissolved organic matter in the presence of dissolved oxygen.

MBBR Biological Reactor Tank (T05)

The primary biological treatment zone containing fluidized carrier media kept in suspension by aeration to provide high surface area for biofilm cultivation.

Sedimentation Tank (T06)

The final clarification zone within the FRP unit where biological sludge flocs settle out by gravity before treated effluent discharge.

Equalization / Collection Tank (T02)

A reinforced cement concrete (RCC) retention chamber supplied and constructed by the client to collect raw sewage from building toilets and dampen hydraulic peak loads.

Indoor MCC Control Panel

The Motor Control Center electrical enclosure installed indoors to control, sequence, and protect STP electromechanical equipment such as blowers and pumps.

CFR (Cost and Freight) Chittagong

The international commercial trade term covering the cost of goods and ocean freight shipment to the Port of Chittagong, quoted at $\$24,267.00\,\text{USD}$.

Advance Payment Term

A commercial contractual condition requiring $60\%$ of the total contract value to be paid as an advance upon issuance of the work order.

Delivery Payment Term

A commercial milestone requiring $35\%$ of the total amount to be disbursed upon delivery of all materials and equipment to the project site.

Commissioning Payment Term

The final payment milestone releasing the remaining $5\%$ of the contract sum upon successful installation, testing, and commissioning of the plant.

Defect Liability Warranty

A contractual guarantee covering free replacement of parts failing due to manufacturing defects for $12\,\text{months}$ ($1\,\text{year}$) from material delivery or $18\,\text{months}$ from Letter of Credit (LC) issuance, whichever occurs earlier.

AIT (Advance Income Tax)

A statutory Bangladeshi tax assessed at $5\%$ ($194,540.75\,\text{BDT}$) on the total supply and installation contract value.

VAT (Value Added Tax)

A statutory indirect tax assessed at $10\%$ ($389,081.50\,\text{BDT}$) on the pre-tax total STP cost.