Stress‑Chemical Dehydration Characteristics Test System For Muddy Media

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Stress‑Chemical Dehydration Characteristics Test System for Muddy Media

Model BTU-MCFA-10

Description

This equipment is astress‑chemical dehydration characteristics test system for muddy media (slurry pressure dehydration test apparatus), modelBTU-MCFA-10, used to study the dehydration characteristics of muddy media such as slurry, sludge, and tailings under the combined effects of mechanical pressure and chemical conditioning. The system mainly consists of a feed cylinder, a feeding loading system, a dehydration cell, a servo loading system, a dehydration weight measurement system, a data acquisition system, and corresponding software. Main function: simulates the solid‑liquid separation process of muddy media under mechanical filtration and chemical conditioning.

Test Standards (International)

• ASTM D1987(Sludge filtration test)
• ISO 11370(Wastewater treatment)
• Chinese GB/T 31962(Wastewater quality standards for discharge into municipal sewers)

This equipment is a specialised test device; applicable standards may refer to solid‑liquid separation and filter press performance testing specifications.

Specification

Detail

• Two‑stage loading design–
  • Feeding loading system: air compressor + precision pneumatic controller (0‑0.9 MPa), used to pressurise slurry from the feed cylinder into the dehydration cell.
  • Servo loading system: 0‑200 kN mechanical loading, applies axial pressure (up to 20 MPa) to the muddy media inside the dehydration cell.
• Dehydration cell– 304 stainless steel, corrosion‑resistant; inner diameter 80 mm, stroke 100 mm, capable of withstanding high pressure (20 MPa).
• Dehydration weight measurement– High‑precision balance (5000 g / 0.01 g) for real‑time measurement of drained liquid mass, used to calculate dehydration rate and total water removal.
• Pore pressure measurement– 0‑20 MPa pore pressure sensor to monitor pore water pressure changes inside the slurry during dewatering, enabling effective stress analysis.
• Chemical conditioning provision– The system name includes "stress‑chemical", suggesting that chemical conditioners (flocculants, electrolytes, etc.) can be added to the slurry to study their effect on dewatering efficiency.
• Software features– Calibration, parameter setting, real‑time data acquisition, data export (tgd → txt → Excel) for convenient post‑processing.

Application

• Municipal sludge dewatering– Simulate sludge dewatering under mechanical pressure and chemical conditioning, optimise dewatering process parameters.
• Tailings thickening– Evaluate dewatering performance of mine tailings slurry for dry stacking or backfilling.
• Dredged sediment treatment– Dewatering tests for river and lake dredged sediments.
• Drilling mud treatment– Solid‑liquid separation of oil/gas drilling muds.
• Chemical conditioning studies– Investigate the effect of flocculants, electrolytes, and other chemicals on slurry dewatering efficiency.
• Filter press simulation– Provide design parameters for plate‑and‑frame filter presses, belt filter presses, etc.

Advantages

• Stress‑chemical coupling– Simultaneously studies the effects of mechanical pressure and chemical conditioning on dewatering, closely simulating field processes.
• High loading force (200 kN)– Capable of simulating high‑pressure filtration, with maximum axial stress 20 MPa, suitable for difficult‑to‑dewater materials.
• High‑precision dehydration weight measurement– 0.01 g accuracy, accurately tracking dehydration rate and total water removal.
• Wide loading speed range– 0.00001‑10 mm/min, from slow filtration to rapid compression.
• Pore pressure monitoring– Real‑time understanding of internal pressure dissipation in the slurry for evaluating dewatering efficiency.
• Corrosion‑resistant material– Dehydration cell made of 304 stainless steel, suitable for saline or chemically treated slurries.
• Automated software– Fully automatic control, convenient data export.

What To Choose

Select this system or related configurations based on testing requirements:

Process Flow

Example:Municipal sludge chemical conditioning + pressure filtration dewatering test

• Sample preparation
  • Take a certain amount of raw slurry (or sludge) and measure initial water content.
  • Add chemical conditioners (e.g., polyacrylamide PAM) according to the test plan and mix uniformly.

• Feeding
  • Pour the conditioned slurry into the feed cylinder (5000 ml capacity).
  • Use the feeding loading system (air compressor + precision pneumatic controller, 0‑0.9 MPa) to pressurise the slurry into the dehydration cell.

• Installation and sealing
  • Ensure the sealing piston, check valve, pore pressure sensor, and drainage lines of the dehydration cell are correctly connected.
  • Place the dehydration weight measurement system (balance) under the drainage outlet.

• Set test parameters
  • In the software, input the dehydration cell inner diameter (80 mm).
  • Set axial loading mode: stress control or displacement control.
  • Define loading sequence: e.g., constant stress 5 MPa for 30 minutes, or constant rate 1 mm/min compression to maximum stroke.
  • Set end conditions: stroke reaches 100 mm or dehydration rate falls below a threshold.

• Start filtration
  • Start the servo loading system; the axial piston moves downward to apply pressure.
  • Software records in real time: axial force, axial displacement, pore pressure, drained liquid mass (balance).
  • Plot dewatering curves: drained mass vs. time, pore pressure vs. time, stress‑strain, etc.

• End of test
  • Automatically stops when preset conditions are reached.
  • Unload pressure, remove the dewatered filter cake, measure final water content.

• Data processing
  • Calculate total water removal, dewatering rate, and filter cake water content.
  • Analyse the relationship between pore pressure dissipation and dewatering rate.
  • Compare dewatering efficiency under different chemical conditioners, pressures, and loading rates.
  • Export data (tgd → txt → Excel) and generate a report.

Summary:The BTU-MCFA-10 is a stress‑chemical dehydration characteristics test system for muddy media, suitable for studying pressure dewatering of municipal sludge, tailings, dredged sediments, and other slurries. Key features include two‑stage loading (pneumatic feeding + servo pressure filtration), high‑precision dewatering weighing, pore pressure monitoring, a corrosion‑resistant dehydration cell, and fully automatic software. Maximum axial stress is 20 MPa, loading force 200 kN, and feed cylinder volume 5 L. Chemical conditioning studies can be optionally added to simulate actual filter press processes. Selection should be based on material characteristics, required pressure, need for chemical conditioning, and dehydration cell size.