Cleaning of Dairy Equipment: Best Practices for Milk Safety

Milk production rules outline what farmers must adhere to. One of them is the proper cleaning of dairy equipment and utensils. Their surfaces accumulate residuals and contaminants, posing a risk to the milk’s quality and safety. This guide will show how to clean them correctly.

Why is Clean Dairy Equipment Important?

Cleaning makes the equipment safe enough to handle milk. In other words, it helps farmers meet hygiene requirements and standards. The equipment can be a milking machine, a pipeline, or a storage tank.

Milk is more predisposed to microbial growth than most other farm products. It spoils if you expose it to unhygienic conditions, leading to losses. Such milk is also a danger to human health.

Cleaning removes milk residuals and contaminants. It also eliminates microorganisms. The cleaning process includes physical, chemical, microbial, and sterilization actions.

• Physical cleaning rids the surfaces of visible dirt.
  
• Chemical cleaning deals with microscopic residuals.
  
• Microbial cleaning removes most microbes, making surfaces clean for longer.
  
• Sterile cleaning is a microbial method that destroys all microbes and prevents their regrowth.
  

Types of Residues and Contaminants

Different residual types (soils) accumulate on the surfaces of milking equipment. They are organic, inorganic, or microbial. Each category has contaminants that farmers must deal with.

Organic residuals include milk proteins, fats, and sugars, while inorganic types are minerals like calcium, iron, and magnesium. Microbes can be bacteria, viruses, protozoa, molds, and other microscopic organisms.

Some soils are easier to clean than others. For instance, warm water and alkaline solutions remove most organic residuals like fats. Inorganic types like salts are more stubborn, requiring acids to clean.

Microbes are challenging to wash off. Their removal requires chemicals like acids or alkali and sometimes boiling water. Hot water kills them, just like it does when sterilizing parts.

A cleaner’s effectiveness depends on its concentration, solution temperature, and cleaning duration. It also depends on the mechanical action you employ.

Dairy Cleaning Agents and What They Do

Cleaning agents break down contaminants to aid their removal. Various chemicals and formulations are available, some offering more cleaning power than others. Dairy cleaning products are detergents or sanitizers.

Dairy Detergents

Dairy detergents form alkaline or acidic solutions. The PH removes specific soils, as we saw earlier. Alkaline solutions tackle proteins and fats, while acidic types suit mineral deposits like calcium and magnesium.

Popular alkaline cleaners include sodium hydroxide and potassium hydroxide. On the other hand, nitric acid and phosphoric acid are common acid-based cleaners.

Dairy Sanitizers

These are dairy cleaning chemicals for eliminating microorganisms. They prevent microbial growth, making equipment remain clean for longer. Farmers usually apply them just before milking for assured cleanliness.

Dairy sanitization products are chlorine-based solutions, acids, and alkaline chemicals like hydrogen peroxide. Boiling water also helps kill most microorganisms and can be a sanitizing method.

Methods of Cleaning Dairy Equipment

Dairy cleaning procedures are manual or mechanical (done with the help of a machine or tools). There are also in-place and out-of-place methods. Let’s see how each technique works and other important information, like effectiveness.

Manual Method

Workers scrub surfaces with brushes, disassembling parts to reach hidden areas. This method is laborious and less hygienic. However, it produces good results when dealing with crevices.

Mechanical Method

The mechanical method uses a pump to spray or circulate the detergent or rinsing liquid. It offers several benefits, such as reducing labor and saving time. It typically relies on flow velocity, with speeds reaching up to 3.0m/s and creating powerful turbulence.

Clean-In-Place (CIP)

CIP is a mechanical process where you clean equipment without dismantling it. The cleaning solution circulates in the machines and pipelines, breaking down and flushing milk residuals and contaminants. A final rinse helps remove the detergent.

Clean-Out-Of-Place (COP)

COP is the opposite of CIP and manual. The cleaner dismantles parts and takes them to a cleaning tank or station. This dairy process is necessary when dealing with equipment that doesn’t suit CIP, such as complex machinery.

Standard Dairy Equipment Cleaning Process

You need these supplies to clean milking equipment: potable water, a water heater, a thermometer, alkaline detergent, and sanitization chemicals. The following is the standard sequence.

Step 1: Warm Pre-Rinse

The rinse removes loose dirt and milk residuals and is best done immediately after milking or emptying vessels. Using warm water makes the rinse more effective on fats. Hot water makes proteins harder to remove.

• Heat water to a warm temperature.
  
• Do not exceed 55°C (131°F).
  
• Disassemble valves and other removable parts.
  
• Rinse the surfaces with warm water.
  
• Continue rinsing until the water is clear.
  

Step 2: Warm Alkaline Wash

This washing step aims to remove stuck materials like milk films. It also removes microbes from the surfaces. It involves adding dairy equipment cleaner (detergent) to break down the soils.

• Add the alkaline cleaning agent (detergent) to the water.
  
• The detergent will help break down fatty residues.
  
• Soak the equipment and parts in the solution for around 5 minutes if using COP.
  
• Turn on the pump to send the solution to various parts (claw, tubes, etc.) in CIP.
  

Step 3: Cold Acid Rinse

The rinsing step uses cold water to remove the washing solution and any remaining mineral deposits. The acid also helps kill microorganisms, ensuring cleaner surfaces. Use soft water to avoid mineral deposition and scale.

• Add a chemical disinfectant to eliminate microbial growth.
  
• Ensure a PH of less than 5 by using small amounts of nitric or phosphoric acid.
  
• Rinse all parts with the cold water flush for 2 to 3 minutes.
  
• Drain the parts after rinsing them.
  

Step 4: Sanitizing

Washing and rinsing alone cannot kill all microscopic organisms. A sanitization process produces better cleaning results, eliminating almost all bacteria and other microbes.

The sanitizer is usually alkaline or acid-based. For instance, you could use chemicals like chlorine, acids, or hydrogen peroxide. You could also thermally disinfect the surfaces with boiling water or steam.

Step 5: Drying

Drying rids the cleaned parts of liquids to prevent renewed microbial growth. Hang buckets and similar containers or hoses upside down. It will quickly drain and dry them. You could also use compressed air to dry the equipment.

Specific Dairy Equipment Cleaning

Specific equipment requires specialized procedures based on its design and parts. Understanding this requirement is essential when dealing with the various parts of a milking system. Notable ones include milking machines, pipelines, and tanks.

Milking Machine and Pipelines

The milking machine requires rinsing after every milk-harvesting session. Because designs vary, you may employ a CIP or COP technique to rid it of contaminants. Ensure the solution reaches every part.

Dismount the milking machine parts and wash them separately. Flush pipelines with hot water and detergent to remove soils and mineral deposits, followed by acid rinses for disinfection.

Milk Storage Tanks and Buckets

Milk tanks and buckets are prone to milk films and mineral deposits. Their cleaning is either CIP or manual, with the help of brushes. The manual method requires the removal of tank covers and other parts like gaskets.

Give the bulk tank and bucket surfaces a thorough scrubbing and wash them in a detergent solution. Rinse the surfaces and parts with acid water and allow them to dry.

Dairy Cleaning Standards and Best Practices

Contamination is a serious risk in the dairy industry. Various standards, therefore, define hygiene and process requirements. Farmers must also understand the importance of clean milk production and cleaning dos and don’ts.

Hygiene and Quality Standards

Various organizations outline milk production hygiene and equipment cleanliness guidelines. They can be regional or international bodies. Popular ones include those listed below.

• Good Manufacturing Practices (GMP).
  
• Good Hygiene Practices (GHP).
  
• Hazard Analysis and Critical Control Points.
  

Best Equipment Cleaning Practices

Farmers must commit to hygienic milk production and handling practices. The following actions will help ensure the equipment is always clean and safe.

• Clean milking equipment immediately before a film forms on the surfaces.
  
• Always use approved cleaners, avoiding corrosive chemicals like alcohols and phenolic.
  
• Train workers on the essentials of clean milk production, such as safety, hygiene requirements, and regulatory standards.
  
• Ensure they wear protective gear, enclosing their bodies when dealing with milking equipment and utensils.
  

Automation in the Cleaning of Dairy Equipment

The modern dairy facility is safer and cleaner than before, thanks to automated cleaning of dairy equipment. Automation reduces labor requirements, but more importantly, minimizes human contact to prevent recontamination.

Automation also makes managing hygiene procedures more effective and efficient. Farmers do not have to worry about delays and negligence. That, in turn, makes hygiene procedures easier to manage and safer.

Automated CIP cleaners also consume less detergent compared to manual cleaners. It also makes contaminant removal and sanitization more versatile by allowing chemical and hot water use.

Conclusion

Cleaning dairy equipment requires a deep understanding of what to do and what not to do. That’s because residues are diverse and include organic and inorganic types. Cleaning materials also vary, with some producing better results than others. We hope this guide provided the information you need to understand the hygiene requirements and cleaning processes.