Emulsified oil are serving as lubricant as well as coolant in various metal industries such as steel making and metal cutting. Disposal of emulsified fluid is a very tough environmental pollution issue. It has high COD and oil/water fully emulsified. Conventional bio-chemical treatment consumes large amount of chemicals and high running cost yet still requires multiple post-treatment steps. The disposal of solid cake will ultimately contaminate underground water. Conventional membrane treatment faces low flux and severe fouling issues. VSEP can simplify treatment process. It has high anti-fouling ability and high recovery ratio. Concentrate can be put as fuel and permeate can achieve discharge standard.

In oil exploration, most oil wells are forcing plenty of fresh water into earth crust to force oil out. The water-to-oil ratio could come to 10:1 or even higher. Water coming out is heavily contaminated by crude oil and polymers, therefore huge amount of produced water need to be treated. At present, plenty of existing technologies can achieve discharge requirement. However, most oil fields face severe water shortage. They urgently require re-injection due to water shortage and pollution. Most oil fields are or will soon become low in permeability. The purity of water is directly affecting the permeatability of earth for further exploration. Therefore, high quality treatment is absolutely required to prevent spoiling earth crust. VSEP works together with some basic low cost equipment can achieve high quality of recycled water in term of particle diameter and oil level. Because of its small footprint and lightweight, VSEP is particularly suitable for offshore oil rigs.

Disposal of emulsified cutting fluid is a very tough environmental pollution issue. It has high COD and well mixed with water. Intensive treatment to discharge standard is costly. Ultra-filtration (UF) is a feasible solution to recycle the water avoiding discharge. If source and type of cutting fluid is isolated, permeate after UF can be reused as same cutting fluid mixing water. Conventional membrane treatment faces low flux and severe fouling issues. VSEP has high anti-fouling ability, high recovery ratio, simple operation. Concentrate can be efficiently incinerated. No chemicals is added and water can be recycled.

Backwash process is necessary in many sand filter operations for maintaining filtration efficiency and performance. These backwash water, with high S.S., would be discharged back to reservoir and would induce accumulation of heavy metals and sands at the bottom of the reservoir. The increase in heavy metals and suspensed solids in the feed water from the reservoir would enter the sand filter again and resulting in more frequent backwashing.

Centrifuge or filter press could be applied for handling the high S.S. concentration backwash water. However, the treated water still could not be directly reused due to the high S.S. concentration in the filtrate / centrate (usually > 100ppm). In order to further reduce the solid content, the wastewater after solid treatment will be treated by the conventional membrane filtration for direct water reuse. Fouling would be a major issue due to the high S.S. concentration in the feed. VSEP can minimize fouling by creating strong shear force on membrane surface. Because of small footprint, VSEP is particular suitable for water treatment plant upgrading.

在鋼鐵業的冷軋過程中，經常會使用到大量的潤滑冷卻液，其所產生的乳化廢水是極難處理的化學污染。以一般中型鋼廠為例，平均每天的污水處理量為2-3m3，COD含量高達121,500。現行的處理方法普遍面對著投葯量高、污泥量高、不達標及不能回用等問題。

正昌VSEP偉思震動薄膜過濾系統，利用超頻震動加強剪切力的薄膜過濾技術，成功解決以往種種的難題，不但簡化了處理程序，亦不用加化學品。此舉大大降低污水廠負荷之餘，冷軋乳化廢水更能脫油回用，使整個處理程序更達經濟效益。