Cleaning & Disinfection

  • View
    215

  • Download
    0

Embed Size (px)

Text of Cleaning & Disinfection

  • 8/8/2019 Cleaning & Disinfection

    1/22

    Cleaning & Disinfection

    FOOD TECHNOLOGY, HYGIENE & SAFETY (DEMT 2333)

    DIPLOMA IN ENVIRONMENTAL HEALTHVICTORIA INTERNATIONAL COLLEGE

    BY: MR KHAIRUL NIZAM MOHD ISADEPARTMENT OF ENVIRONMENTAL HEALTH

  • 8/8/2019 Cleaning & Disinfection

    2/22

  • 8/8/2019 Cleaning & Disinfection

    3/22

    INTRODUCTION

    Objective of clean depend on standard requirement

    aesthetic clean (appearance only)

    physical clean

    microbiological clean (high-risk food):

    x Cleaning

    x Disinfection

  • 8/8/2019 Cleaning & Disinfection

    4/22

  • 8/8/2019 Cleaning & Disinfection

    5/22

  • 8/8/2019 Cleaning & Disinfection

    6/22

    Other costs:

    poor quality product shelf-life

    customer complaint, loss reputation

    food poisoning

    wastage

    taint, contamination

    corrosion equipment replacement

    breakdown NaOH remove grease from bearings

    deterioration of floor surface, drain

  • 8/8/2019 Cleaning & Disinfection

    7/22

    Management functions of cleaning

    Commitment

    Required standards clearly defined, communicated, reinforced

    Provide means

    adequately trained cleaning staff, supervise, supplied with

    appropriate materials and equipment. Minimize different

    cleaning agents

  • 8/8/2019 Cleaning & Disinfection

    8/22

    Cleaning schedules

    communication link between management and staff

    planning schedule should consider:

    size, type, temperature of area, structure of building, wall,

    floor and ceiling finishes

    type of equipment and material

    whether equipment can be dismantled type of soiling

    presence of electrics

    water pressure, drainage system

    time constraints, manpower and training needs if cleaning necessary during food preparation required

    disinfection?

    Requirements underHealth and Safety Act

    Controls available to monitor effectiveness of cleaning

    Overall cost e.g. labour, equipment, chemicals, water, heat

  • 8/8/2019 Cleaning & Disinfection

    9/22

    Specify:

    what is to be cleaned

    who is to clean

    when to be cleansed

    how is to be cleaned

    time necessary to clean it

    chemicals, material, equipment

    cleaning standards

    precautions

    protective clothing

    who to check and record that it has been cleaned

  • 8/8/2019 Cleaning & Disinfection

    10/22

    Administration

    Select chemical supplier -

    x cheap chemical ? expensive cleaning

    x have expertise to demonstrate how to use product with

    best effect

    Stock control

    Distribution transfer right materials, right quantity,

    right people, right time

    Financial control

    rotation, delivery check, inventory control

    records

    Expenditure

    area of use

  • 8/8/2019 Cleaning & Disinfection

    11/22

    TECHNOLOGY OF CLEANING

    Cleaning - systematic application of energy to a surface or

    substance, with intention of removing dirt.

    Energy in cleaning -

    1. kinetic energy:a) physical - manual labour

    b) mechanical -machines

    c) turbulence -liquids (CIP)

    2. thermal energy: hot water 3. chemical energy: detergents

    Combination of 2 or more energy. Manual labour most

    expensive. Adequate contact time important. Correct energy

    balance (cost-effective cleaning)

  • 8/8/2019 Cleaning & Disinfection

    12/22

    Cleaning costs:

    *If wrong chemicals corrosion costs

    Labour 70% Chemicals 6%

    Equipment 12% Heating 4%

    Water/effluent 6% Corrosion 2%

    If buckets and mops

    used only :

    equip. cost

    lower equip cost but labour cost

  • 8/8/2019 Cleaning & Disinfection

    13/22

    Chemical cleaning

    Detergents - soaps

    Alkaline - caustic soda corrosive to skin, Al, zinc,

    good for fat, protein

    Acid - remove mineral, protein, veg. Phosphoric acid

    (least corrosive)Toxic release Cl2 gas not use with chlorinated

    Powder

    Liquid

    Foam

    gel

    reduce surface tension, breakup

    matter to smaller particles

    suspended easily rinsed

  • 8/8/2019 Cleaning & Disinfection

    14/22

  • 8/8/2019 Cleaning & Disinfection

    15/22

    Surfactancy

    Property of detergent which enables to increase the wetting

    power of water by reducing the surface tension. This

    increase he contact between the soil and the detergent

    solution which is able to penetrate the minute irregularitiesof the dirt more effectively.

    Dispersion

    This is the ability of a detergent to break up large

    accumulations of matter into smaller particles. Suspension

    When dirt is broken up into particles, they become coated

    with a thin film detergent which keeps the particles apart

    and buoyant allowing them to be rinsed away.

    (emulsifying action of detergent)

  • 8/8/2019 Cleaning & Disinfection

    16/22

    Alkaline detergents

    Commonly uses: caustic soda (sodium hydroxide)

    corrosive to skin.

    Aluminum and zinc has poor wetting properties, but is

    effective for fat and protein solubility and is relativelycheap.

    Sequestering agents (chelates) such as amino carboxylic

    acids, EDTA and NTA are added to prevent scale formation

    in hard water. Acid detergents

    Mainly used to remove mineral, protein and vegetable

    deposits.

    Contain phosphoric acid

  • 8/8/2019 Cleaning & Disinfection

    17/22

    Detergent action

    Grease on

    Surface

    Detergent

    penetration

    Globule

    formedGlobule

    formed

    Globules in

    suspension

  • 8/8/2019 Cleaning & Disinfection

    18/22

    Types of soil

    Organic - living matter e.g. animal fat, veg.Oil, starch, sugar,

    protein from milk, egg, meat or blood

    remove by neutral or alkaline detergent

    If heated, dried or allowed to remain for prolonged period

    alkalis must be used to remove them

    Grease or oil is heated form a tenacious, dark, sticky

    deposit known as polymerized grease.

    Further heating of polymerized grease results in the

    formation of carbon removed by caustic alkalis suchsodium hydroxide or potassium hydroxide.

    Tannin which derived from tea, coffee or wine removed

    by an oxidizing agent such as sodium hypochlorite (bleach)

    or sodium perborate. If present with water hardness salt

    use an acid detergent.

  • 8/8/2019 Cleaning & Disinfection

    19/22

  • 8/8/2019 Cleaning & Disinfection

    20/22

    Inorganic

    Water hardness salt (scale)

    oxidised metal (rust)

    uric acid salts (urinal stain)

    beerstone

    calcium salt from milk (milkstone)

    Removed by acids such as

    hydrochloric & phosphoric

  • 8/8/2019 Cleaning & Disinfection

    21/22

  • 8/8/2019 Cleaning & Disinfection

    22/22

    Thank You