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Cross-flow membrane filtration machine for liquids

Traditional cake filtration and diatomaceous earth filtration—commonly referred to as direct-flow filters—involve a slurry that flows perpendicular to the surface of the filter medium, with solids being retained by the medium and gradually forming a filter cake.

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Filtration equipment

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Product Description

Product Overview
Traditional cake filtration and diatomaceous earth filtration—commonly referred to as direct-flow filtration—involve the slurry flowing perpendicular to the surface of the filter medium, with solids being retained by the medium and gradually forming a filter cake. As filtration continues and the cake thickens, the filtration rate declines markedly until the filtrate ceases to flow. In contrast, cross‑flow filtration operates on the principle of using a recirculation pump to drive the feed material through the pores of a membrane of varying pore sizes at high velocity. Under pressure, the permeate is drawn off tangentially, while the retentate, due to its high‑speed flow, generates turbulence that continuously flushes the membrane surface, carrying away any solid particles adhering to it. This prevents membrane fouling and ensures steady filtration. Compared with conventional dead‑end filtration, cross‑flow filtration offers significant advantages. For instance, under identical conditions, the permeate flow in dead‑end filtration can drop to zero within minutes, whereas cross‑flow filtration maintains a nearly constant flow rate. Moreover, cross‑flow filtration is insensitive to variations in feed concentration and can successfully handle highly contaminated feeds without prior pretreatment.

Technical Features
1. The membrane material, which is high-strength, acid- and alkali-resistant, and oxidation‑resistant, can withstand intensive, frequent backflushing as well as prolonged, high‑concentration chemical cleaning, thereby ensuring long service life and low operating costs.
2. With a fixed pore size and no filter aid added, the filtration performance is stable and reliable, completely eliminating the various sources of instability associated with diatomaceous earth filtration and the environmental burdens of spent filter cake disposal.
3. High-precision, sterilizing-grade filtration delivers exceptionally clear effluent, achieving a sterilization efficiency of over 99%, while having no adverse impact on valuable bioactive compounds in food, such as sugars, amino acids, alcohols, and lipids.
4. It can handle filtration of highly turbid and highly viscous liquids, completing both coarse and fine filtration in a single step, eliminating the need for conventional cotton‑cake or diatomaceous earth filters as pre‑filters.
5. The unique cross-flow process design and automated self‑cleaning during operation ensure continuous, large‑scale separation; compared with conventional membrane separation equipment, it improves separation efficiency by more than 40% and delivers outstanding anti‑fouling performance.
6. The filter membrane assembly features a quick‑release, detachable design; when necessary, the membrane can be removed for thorough offline cleaning, resulting in improved cleaning performance. Additionally, the reusable housing significantly reduces the cost of membrane replacement.
7. The most practical modular separation unit design allows for operation with either all or partial separation modules, depending on the total separation volume, offering advantages such as a small footprint, low energy consumption, minimal liquid holdup, and reduced waste.
8. The system employs a PLC‑based automated control system, offering exceptionally simple operation. Optional online monitoring and protection of key separation parameters—such as temperature, pressure, and turbidity—ensure that improper操作 does not compromise equipment performance or separation efficiency.
9. CIP‑type automatic cleaning and disinfection, convenient and thorough, ensures ideal restoration of the membrane’s separation performance.
10. The entire machine is manufactured from food-grade stainless steel 304 or 316L, complying with national food and pharmaceutical hygiene standards as well as QS/GMP certification requirements.