BST425 — Brewhouse Contamination, Hygiene & Safety Measures: Lecture Note

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LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS • Course code: BST425 • Course title: Brewhouse Contamination, Hygiene & Safety Measures • Course credit load: 2 Series 1: Brewhouse Contamination Pathways Series outline • Part 1: Sources of Contamination in the Brewhouse o Sub-Part 1.1: Raw materials as contamination vectors o Sub-Part 1.2: Equipment and surfaces as contamination points o Sub-Part 1.3: Personnel and handling practices • Part 2: Types of Contaminants in Brewing o Sub-Part 2.1: Microbial contaminants (bacteria, yeasts, moulds) o Sub-Part 2.2: Non-microbial contaminants (chemical, physical) • Part 3: Pathways of Contamination During Brewing Operations o Sub-Part 3.1: Wort production and fermentation stages o Sub-Part 3.2: Conditioning, storage, and dispensing stages • Part 4: Preventive Approaches to Contamination Control o Sub-Part 4.1: Hygiene practices and monitoring o Sub-Part 4.2: Rapid detection and response methods Introduction Brewing is a delicate process where even the smallest lapse in hygiene or handling can lead to contamination, affecting both product quality and consumer safety. In the brewhouse, contamination can occur through raw materials, equipment, or personnel, and if left unchecked, it may compromise the entire brewing cycle. Understanding how contamination pathways develop is therefore essential for anyone involved in brewery operations, as it lays the foundation for effective prevention and control.

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS The aim of this Series is to equip you with the knowledge and skills to identify, analyse, and evaluate the various ways contamination can enter the brewing process, and to prepare you to apply preventive measures that safeguard both product integrity and workplace safety. We shall commence this Series by examining the sources of contamination in the brewhouse, focusing on raw materials, equipment, and personnel. Next, we will explore the different types of contaminants, distinguishing between microbial and non-microbial forms. Subsequently, we will analyse the pathways through which contamination occurs during brewing operations, from wort production to dispensing. Finally, we will wrap up by considering preventive approaches, including hygiene practices and rapid detection methods, to ensure contamination risks are minimised. Series Learning Outcomes Upon completing this Series, you should be able to: • SLO 1.1 define the main sources of contamination in the brewhouse, including raw materials, equipment, and personnel, • SLO 1.2 explain the types of contaminants that affect brewing, distinguishing between microbial and non-microbial forms, • SLO 1.3 analyse the pathways of contamination during brewing operations, from wort production through to dispensing, and • SLO 1.4 evaluate preventive approaches to contamination control, including hygiene practices and rapid detection methods. 1.1 Sources Of Contamination In The Brewhouse 1.1.1 Raw materials as contamination vectors Raw materials such as malt, hops, and water are the foundation of brewing. However, they can also serve as contamination vectors, meaning they may carry unwanted substances or organisms into the brewhouse. For example, malt can harbour mould spores, hops may contain residual pesticides, and water can introduce bacteria if not properly treated. These contaminants can compromise fermentation and lead to off-flavours or spoilage. Fill in the blank: Contamination vectors are raw materials that may carry ______ into the brewhouse.

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Diagram showing raw materials (malt, hops, water) and possible contamination routes. Figure 1.1: Raw materials as contamination vectors 1.1.2 Equipment and surfaces as contamination points Brewhouse equipment such as tanks, pipes, and valves can become contamination points if cleaning and sanitisation are neglected. A contamination point is any surface or component where microorganisms or residues accumulate and later enter the brewing process. Even small deposits of organic matter can provide a breeding ground for bacteria and yeasts. Regular cleaning schedules and microbiological checks are therefore essential. Fill in the blank: A contamination point is any surface or component where ______ accumulate and later enter the brewing process.

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Image showing brewery tanks and cleaning procedures. Plate 1.2: Cleaning of brewhouse tanks to prevent contamination 1.1.3 Personnel and handling practices Human activity is another major source of contamination. Personnel may introduce contaminants through poor hygiene, improper clothing, or unsafe handling practices. Personnel contamination refers to the transfer of microorganisms or foreign matter from workers to brewing materials or equipment. Wearing protective clothing, practising hand hygiene, and following lockout procedures are critical to reducing risks. Fill in the blank: Personnel contamination refers to the transfer of ______ from workers to brewing materials or equipment. Box 1.3: Recommended hygiene practices for brewery personnel • Wash hands before handling raw materials • Wear protective clothing and footwear • Use gloves when cleaning or sanitising equipment • Follow lockout procedures before entering tanks or vessels Pilot questions 1.1 1. Which raw material is most likely to harbour mould spores? 2. What is meant by the term contamination point in brewing equipment? 3. Why is water considered a potential contamination vector?

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 4. List two hygiene practices that personnel should follow to reduce contamination risks. 5. Fill in the blank: Contamination vectors are raw materials that may carry ______ into the brewhouse. 1.2 Types Of Contaminants In Brewing 1.2.1 Microbial contaminants (bacteria, yeasts, moulds) Brewing environments are highly susceptible to microbial contaminants, which are living organisms such as bacteria, yeasts, and moulds that can interfere with the brewing process. Bacteria may cause souring or spoilage, unwanted yeasts can compete with brewing yeast strains, and moulds may produce toxins or off-flavours. These microorganisms thrive in moist environments and can easily spread through raw materials, equipment, or even the air. Fill in the blank: Microbial contaminants are living organisms such as ______ that interfere with the brewing process. Diagram showing bacteria, yeast, and mould contamination pathways in brewing. Figure 1.3: Microbial contaminants in brewing 1.2.2 Non-microbial contaminants (chemical, physical) In addition to microorganisms, brewing can be affected by non-microbial contaminants, which include chemical and physical hazards. Chemical contaminants may arise from cleaning agents, pesticides, or residues from packaging materials. Physical contaminants include foreign objects such as glass fragments, metal shavings, or dust particles that may enter during processing or

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS storage. These contaminants pose serious risks to consumer health and product quality, making strict monitoring essential. Fill in the blank: Non-microbial contaminants include ______ and physical hazards that affect brewing. Table 1.1: Examples of microbial and non-microbial contaminants in brewing Contaminant type Examples Possible effects Bacteria Lactic acid bacteria Sour flavours, spoilage Yeasts Wild yeast strains Competition with brewing yeast Moulds Aspergillus species Toxin production, off-flavours Chemical Cleaning agent residues Toxicity, altered taste Physical Glass fragments, dust Injury, product rejection Pilot questions 1.2 1. Name two types of microbial contaminants that can affect brewing. 2. What is the main difference between microbial and non-microbial contaminants? 3. Give one example of a chemical contaminant in brewing. 4. Fill in the blank: Non-microbial contaminants include ______ and physical hazards that affect brewing. 5. Why are physical contaminants considered a serious risk in brewing? 1.3 Pathways Of Contamination During Brewing Operations 1.3.1 Wort production and fermentation stages During wort production, contamination can occur when raw materials or water introduce unwanted microorganisms. Wort is the sweet liquid extracted from malt, and because it is rich in sugars, it provides an ideal environment for microbial growth. If equipment is not properly sanitised, bacteria or wild yeasts may enter at this stage. In fermentation, contamination is

LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS particularly critical because brewing yeast must dominate the process. Any intrusion of wild yeast strains or bacteria can result in off-flavours, reduced alcohol yield, or spoilage. Fill in the blank: Wort is the sweet liquid extracted from ______ and provides an ideal environment for microbial growth. Diagram showing wort production and fermentation contamination points. Figure 1.4: Contamination pathways during wort production and fermentation 1.3.2 Conditioning, storage, and dispensing stages After fermentation, beer undergoes conditioning, where flavours mature and unwanted compounds settle. Contamination at this stage often arises from improper cleaning of tanks or exposure to airborne microorganisms. In storage, beer may be compromised by chemical residues or physical contaminants if containers are not properly maintained. Finally, during dispensing, contamination can occur through poorly sanitised taps, pipes, or serving equipment. Each of these stages requires strict hygiene protocols to ensure product quality and consumer safety. Fill in the blank: Contamination during dispensing often arises from poorly sanitised ______, pipes, or serving equipment.

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