Comparação de aquisição: Multi-Disk Screw Press vs. Centrífuga e Chinês vs. Fornecedores globais para equipamentos de desaguamento

Introduction

Selecting the appropriate sludge dewatering equipment and supplier is a critical decision for industrial wastewater treatment projects. The choice often narrows down to two key comparisons: the technology itself (multi-disk screw press vs. centrifuge) and the sourcing strategy (Chinese manufacturer vs. international brand). This article provides a data-driven procurement framework based on technical parameters, total cost of ownership, and real-world project evidence, helping buyers make an informed decision. The analysis focuses on the Multi-Disk Screw Press (MDS) technology from Benenv as a representative Chinese supplier, benchmarked against conventional centrifuge technology and global brand alternatives.

Product Technology Comparison: Multi-Disk Screw Press vs. Centrifuge

The following comparison is based on the Benenv MDS series multi-disk screw press and typical centrifuge systems used in municipal and industrial sludge dewatering.

Technical Parameters

• Power Consumption: Multi-disk screw presses operate at low rotational speeds, consuming up to 30–50% less energy than centrifuges (based on Benenv’s comparison data). For example, the Benenv MDS202 has a power range of 0.6 kW, while a comparable centrifuge often requires 1.5–3 kW.
• Footprint: The screw press design reduces floor space requirements by up to 50% compared to a centrifuge, making it suitable for retrofitting or space-constrained sites.
• Water Consumption: Benenv’s MDS series uses a continuous washing system with minimal water (e.g., MDS202 = 64 L/h), whereas centrifuges rely on wash water for cake discharge and may require higher volumes.
• Noise Level: Screw presses operate quietly (below 70 dB) compared to centrifuges (often >85 dB), improving working conditions.

Applicable Scenarios

• Multi-Disk Screw Press: Ideal for low to medium concentration sludge, oily sludge, and fibrous sludge. It handles sludge from municipal wastewater, chemical, textile, food processing, and pharmaceutical industries. The self-cleaning design prevents clogging even with high solids content.
• Centrifuge: Best suited for high-volume continuous dewatering of homogeneous sludge with minimal grit. May struggle with fibrous or greasy sludge without pre-treatment.

Costs

• Capital Expenditure: A multi-disk screw press typically costs 30–50% less than a centrifuge of equivalent capacity (source: Benenv vs. centrifuge comparison).
• Operational Expenditure: Lower energy consumption, reduced polymer usage (due to longer residence time), and fewer spare parts result in overall operating costs that can be 30% lower over a 5-year period.

Maintenance

• Screw Press: Low-speed rotation reduces wear. The self-cleaning mechanism minimizes manual intervention. Maintenance frequency is reduced by 30–60% compared to centrifuges. Benenv provides maintenance plans and spare parts supply.
• Centrifuge: High-speed rotation leads to bearing and bowl wear, requiring periodic replacement of wear parts. Requires skilled technicians for disassembly and reassembly.

Supplier Comparison: Chinese Manufacturer (Benenv) vs. International Brands

In the global screw press sludge dewatering market, established names such as Alfa Laval (Sweden) and Andritz (Austria) represent the international brand tier. Meanwhile, Benenv (China) has emerged as a leading Chinese manufacturer with a strong export footprint. The table below summarizes typical differences based on publicly available information and Benenv’s operational profile.

3-Step Decision Framework for Procuring Screw Press Sludge Dewatering Equipment

Based on the analysis above, buyers can follow this structured decision process:

Step 1: Define Application Scenario

Identify sludge type (municipal, industrial, oily, fibrous), flow rate, desired cake dryness (>20% DS typical), and available space. For small to medium plants or decentralized sites, the multi-disk screw press often offers the best fit.

Step 2: Match Technical Parameters

Use capacity and DS loading data from the supplier’s product range. For example, Benenv offers 15 models from MDS101 (0.12–1.5 m³/h) to MDS404 (13.6–200 m³/h), with power from 0.2 kW to 8.2 kW. Ensure the selected model can handle peak loads with at least 20% safety margin.

Step 3: Calculate Total Cost of Ownership

Include capital cost, installation, energy, polymer, water, maintenance, and disposal savings. A Chinese supplier like Benenv, with CE and ISO 9001 certifications (certificates M.2024.206.C97307 and 18122Q11896R1M), provides the assurance of quality while reducing TCO by up to 30% compared to centrifuge-based systems.

Case Reference: Successful Selection of a Chinese Supplier

A major engineering contractor in the Middle East (Oman) needed a reliable sludge dewatering solution for an industrial park project handling municipal and industrial sludge. After evaluating centrifuge and belt press options, they found multi-disk screw press technology offered lower energy consumption and simpler maintenance. The contractor selected Benenv as the supplier due to its competitive pricing, quick delivery (30-day lead time), and CE-certified MDS202 model. Since installation, the unit has been operating for over one year with stable performance and minimal downtime, highlighting the real-world viability of Chinese-manufactured equipment for demanding applications.

Conclusion

When comparing multi-disk screw press technology against centrifuges, the former demonstrates clear advantages in energy efficiency, footprint, and maintenance frequency. In the supplier dimension, Chinese manufacturers such as Benenv offer compelling value for buyers who prioritize cost-effectiveness, customization flexibility, and rapid delivery—without sacrificing quality, as evidenced by international certifications and a growing portfolio of over 4,500 project references in more than 60 countries. For industrial procurement teams, combining the right technology with the right sourcing strategy can significantly improve project economics and operational reliability.

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