Bacteria Removal from Milk and Whey

Ensuring top-notch quality in milk and whey products is paramount in the dairy industry. Bacteria such as Bacillus cereus, notorious for inducing sweet coagulation in packaged dairy goods, pose a threat by significantly reducing shelf life.

Conventionally, heat has been the go-to method for eliminating these microorganisms during production.

However, temperatures exceeding 128°C are necessary for efficacy, risking alterations in taste and nutritional content.

The presence of bacteria in raw milk and whey can jeopardize product excellence, affecting taste, shelf life, and safety.

To tackle this challenge head-on, Huading presents advanced sterilizing separators engineered to elevate product quality and safety.


How to Achieve Optimal Bacteria Removal in Dairy Products

Various techniques can be employed to enhance the quality of dairy products, with one notable method being the utilization of centrifuges – specialized separators leveraging centrifugal force to eliminate microorganisms.

Centrifugal sterilizers serve as a potent tool in reducing the presence of Clostridium spores in milk, proving indispensable in cheese milk pretreatment, consumer milk production, and the manufacturing of milk powder and whey powder.

By minimizing the introduction of air, the risk of particle and aggregate size reduction is mitigated, thereby bolstering the efficiency of spore and bacteria removal.

Huading’s centrifugal sterilization machines operate with exceptional delicacy. Products smoothly enter the sterilizer bowl and gradually accelerate as they traverse the hollow rotating shaft.

The careful management of airflow at this stage ensures that fat globules within the product remain intact, preventing downstream foaming issues.

With Huading’s centrifugal sterilizers, such concerns are effectively addressed, guaranteeing the preservation of product integrity throughout the processing journey.

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Huading Separator’s Operation Process

Pressurized conveyance of milk/whey through closed tubes.
Smooth flow into the drum via the feed pipe and distributor.
Centrifugal force moves bacteria and solid particles to the drum’s periphery, where they accumulate before automated discharge.
Clarified milk/whey ascends through the disk set and is discharged by the centripetal pump.
The concentrate ascends above the upper plate and is drained by the centripetal pump or re-enters the bowl for further concentration.

Technologist in protective uniform wearing hairnet mask goggles

At Huading Separations, our commitment to providing innovative solutions underscores our dedication to assisting dairy producers in achieving unparalleled product quality and safety. Our sterile separators epitomize this commitment, offering dependable performance, efficiency, and adaptability to dairy processing operations of all scales.

Milk and Whey Clarification

The opaqueness of a liquid stems from suspended particulate matter within it, which reflects light and gives the solution a turbid appearance. “Clarification” is the process of refining these fine particles to achieve transparency.

Understanding Milk and Whey Clarification

Milk and whey clarification is a pivotal step in dairy processing, aimed at eliminating impurities, solids, and unwanted particles from milk and whey to yield a clear liquid. This procedure is paramount for enhancing product quality, eliminating odors, and extending shelf life.

Typically, clarification employs a variety of techniques such as filtration, centrifugation, or sedimentation to separate undesirable components from the liquid phase, resulting in a clarified product devoid of visible impurities. The clarified milk and whey can then be further processed into a diverse array of dairy products, including cheese, yogurt, and whey protein powder.

Understanding Milk and Whey Clarification
The Role of Separators in Milk and Whey Clarification

The Role of Separators in Milk and Whey Clarification

Separators play a pivotal role in the milk and whey clarification process, enabling manufacturers to produce purer, higher-quality dairy products while upholding product hygiene and safety standards.

Solid-Liquid Separation: Utilizing high-speed rotation or filtration technology, separators effectively separate solid particles and impurities from milk and whey, rendering the liquid portion clearer and more transparent.

Skim Process: Separators are instrumental in extracting fat from milk to produce low-fat or skim dairy products. By adjusting separator speed and process parameters, manufacturers can achieve varying fat content in their products.

Protein Separation: Whey contains valuable whey protein, and separators efficiently isolate whey protein from other whey components (such as lactose and minerals) to produce high-purity whey protein powder and other products.

Bacterial Removal: Employing high-speed centrifugation or micropore filtration technologies, separators remove bacteria, microorganisms, and other harmful pathogens from milk and whey, thereby enhancing the hygienic safety of the final product.

Improving Product Quality: Separators effectively eliminate foreign matter and impurities from milk and whey, elevating the purity and quality of the end product and meeting consumer demand for premium dairy products.

Huading High-Performance Dairy Products Separator

Huading’s high-performance separators are meticulously engineered to meet the milk and whey clarification requirements of the dairy industry. Tailored to accommodate various capacity needs, these separators boast unique innovations that ensure efficient, reliable, and cost-effective separation processes.

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Huading High-Performance Dairy Products Separator

Extract CBD From The Hemp Plant

Also known as cannabidiol, CBD is one of the numerous compounds found in the hemp plant that is now known to have an array of medicinal benefits. Over the last few years, CBD has become so popular that it is now being extracted, produced and manufactured into a wide range of products, including edibles, CBD oils and even creams.

The most popular form of consumption is CBD oil and it is used to treat a number of illnesses; primarily because of the way it effects the endocannabinoid system (ECS) and doesn’t provide users with a ‘high’ that is illegal in many countries around the world. THC is the cannabinoid best known for providing this ‘high.’ Not only does CBD not get you ‘high,’ but it also helps reduce THC’s psychoactive effects.

What is a CBD Substance?

If you are reading this page, you most probably know what THC is. It (delta-9 tetrahydrocannabinol) is the most active ingredient in cannabis, and until recently, it was by far the best-known. THC is renowned for the mind-altering high it provides to users. In contrast, CBD is not psychoactive, but it does promote positive changes in the body.

The way CBD affects our body is quite different from the modus operandi of THC in the sense that it is not involved in direct stimulation of the CB1 and CB2 receptors. The major impact of CBD is caused on other receptors such as Serotonin, Adenosine, and Vanilloid.

For instance, the stimulation of the TRPV-1 receptor by CBD creates a variety of processes including body temperature, inflammation, and pain perception.

Moreover, CBD is known to cause an inhibition in the functioning of the FAAH enzyme that directly acts on the CB1 receptor and enables THC to produce its psychoactive effect. CBD has established global interest among industry specialists and its discovery has prompted medical experts to take a closer look at the benefits of CBD.

CBD Extraction Methods

Various strains of industrial hemp are a popular way to extract CBD. They are grown around the world legally; including in India, China and several countries in Western Europe.

One of the most popular industrial hemp strains is Fedora 17 because it has an extremely low THC content which means that any CBD extracted from it has virtually no psychoactive effects. CBD oil made from hemp is legal in almost every country around the world including in all 50 states in the U.S. because of the negligible THC content.

There are four common extraction methods:

━ The CO2 Cannabis Extraction Method
━ The Olive Oil Extraction Method
━ The Dry Ice Extraction Method
━ The Solvent Extraction Method

In the industrial mass production process, the ethanol extraction process is the most common CBD extraction method, thanks to its high efficiency and low cost. Filtration is a common step in producing cannabis and hemp concentrates.

Centrifugation is the most effective and efficient way of separating the extracts from the solid biomass material. The extraction process can be carried out in an upstream vessel in most cases.

The goal of filtration is to improve clarity, increase potency, enhance stability and create an overall better consumer experience. The highest possible yield of wanted active ingredients and at the same time lowest possible amount of solids and unwanted substances in the extract are the most common demands for the filtration step.

Customer story

One decanter and one separator were installed in HMI ( in 2017 for extracting CBD from hemp.



Decanter for Extracting CBD From The Hemp Plant

Skimming Milk and Whey

Milk skimming process

Raw milk of known fat content, free from air, should be fed to the milk separator at relatively constant temperature and capacity. A change in operating conditions will influence the skimming efficiency. Standardized cream and skimmed milk are the products leaving the separator.

Sediment discharged from the centrifuge during separation may contain bacteria, leucocyte, hair, sand and similar. If the hot milk separator is the first centrifugal clarification step in the dairy, the discharged sediment is not possible to recycle. The best way to dispose it is to sterilize it with steam and dump it.

Whey skimming process

For an efficient separation of fat most of the remaining cheese fines have to be removed before separation. Fines can be taken away by sedimentation in tanks, by filtering or by centrifugal clarification. Whey, free from air and preferably from fines, should be fed to the separator, at relatively constant temperature and capacity.

A change in operating conditions will influence the separation efficiency. Whey cream and skimmed whey are the products leaving the separator. Sediment discharged from the centrifuge during separation consists of residual cheese dust and precipitated whey proteins. The best way to dispose it is to send it back to the farmers.

Separation efficiency

With efficiency for a separator, we normally mean the ability to reduce the fat content in milk. But we can also define the performance in terms of the possibility of producing cream with a consistent and high fat content, or a production with no unintentional stops.

For standardization of milk, fat content in skimmed milk is of less importance because part of the cream is re-mixed to get the proper fat content in the standardized milk. For this reason, you may standardize at a higher capacity than used for skimming.

Product Quality

The product quality in a milk separation process is most often measured in terms of free fat and air in the discharged products. The temperature for crystallization and melting of milk fat ranges from 17-38°C. Therefore, it is important to heat the milk to about 45°C before separation, to be sure not to
damage globules with partly melted fat.

Free fat causes two serious faults, sticking and clumping. Rancid flavours may also develop as a result of lipolytic reactions. If the incoming milk contains too much air there will primarily be a problem with cream control and foaming in product tanks.

Secondarily, air is the major cause of the destruction of fat globule membranes. The membranes may repair themselves again, but the globule is smaller and free fat has occurred. Smaller globules mean more fat in skimmed milk.



Palm oil purifier


The palm oil Purifier is widely used for the purification of palm oil. The oil is fed from the oil tank to the purifier where impurities and water are removed. After purification the oil passes to the vacuum dryer, and is finally pumped to the main storage tank via an oil cooler.

The PASB purifier is a solids ejecting disc stack type centrifuge. The rotating bowl is driven by the electric motor via the flat belt or gear worm. With the feed closed, oil is displaced from the bowl by the addition of displacement water and discharge water is added to release the hydraulic closing force, lowering the sliding bowl bottom. After the discharge cycle, a new water seal is established in the bowl and separation continues. Oil is fed into the purifier by using an external pump. The operating water slide and the complete hydraulic system controlling the sludge discharges are inside the bowl. There is no possibility of contamination from external sources.

The separator bowl is designed for partial discharge of separated sludge, which means that there is a minimal loss of oil. The drive system is of belt drive, or the worm and worm wheel.
The feed system is via external pump system. No operating water tank is required as the purifier requires water at high pressure and this is achieved by an external water pump which operates only during the discharge cycle. Discharging have to be made at regular interval of 15 to 20 minutes and each discharge cycle last for a period of several seconds. The discharge system is fully automated with manual override system.


Operating principle of palm oil purifier

Separation takes place inside a rotating bowl. The teed is introduced to the rotating centrifuge bowl from the top via a stationary inlet pipe, and is accelerated in the
distributor, before entering the disc stack. The separation of liquid-liquld-solids takes place between the discs, with the oil phase moving through the disc stack to the center and is discharged via a stationary centripetal pump. The water and solids separated from the oil moves out to the periphery, the water is led via channels in the top disc to the paring chamber, where it flows out of the centrifuge via holes in the bowl hood. The solids are collected in the periphery of the bowl, from where it is discharged intermittently. The solids discharge is achieved by a hydraulic system which at preset suitable intervals forces the sliding piston to bend down and thus opening the solids ports at the bowl periphery.