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Bioremediation Procedure

The document outlines a procedure for bioremediation or land farming to clean and improve soils polluted with hydrocarbons from Zimphos. It details responsibilities, safety measures, and step-by-step activities for soil treatment, including soil sampling, pH adjustment, fertilization, and composting. The procedure aims to ensure effective remediation within six months, allowing the soil to support vegetation growth.

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Makanaka Mabwe
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43 views3 pages

Bioremediation Procedure

The document outlines a procedure for bioremediation or land farming to clean and improve soils polluted with hydrocarbons from Zimphos. It details responsibilities, safety measures, and step-by-step activities for soil treatment, including soil sampling, pH adjustment, fertilization, and composting. The procedure aims to ensure effective remediation within six months, allowing the soil to support vegetation growth.

Uploaded by

Makanaka Mabwe
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Procedure: Title: Bioremediation or Land Farming

Intent: To establish and maintain a documented procedure for


cleaning up and improving soils polluted with
hydrocarbons.
Application: This procedure applies to all soils polluted with
hydrocarbon originating from Zimphos.
Prepared By: D. Nyoni Approved By: J. Mandirasa
Position: Safety, Health and Position: Safety, Health, Environment and Quality
Environment Officer Manager.
Date: 23/09/2014 Date: 23/09/2014
Signature: Signature:
Reason for review: To create soft copy

1. Safety and Environment

Dust usually emanates from the land during remediation hence protective clothing
must be worn when working.

2. Responsibility

The Safety, Health and Environmental (SHE) Manager is responsible for ensuring that this
procedure is implemented, maintained and regularly reviewed in line with the changes in
operations, technology, legislation, standards, circumstances and government policies.

3. Activity description

1) Using an auger take soil samples from polluted area and submit to laboratory for
analysis for total petroleum hydrocarbons (TPH), pH, Nitrogen and Phosphorous
content
2) If the soil is acidic add agricultural lime to bring the pH up to between 6.5 and 7.5
having determined the amount of lime required per cubic metre (m 3) of the
contaminated soil. Generally, this works out to a dose of 1kg lime per 1m 3 of polluted
soil.
3) Check the pH again Seven days after adding the lime and if necessary add more lime.
4) When the pH reaches the suitable range add a fertilizer (7 N: 14P: 7K compound D) at
the rate of 350grammes to every 1m3 of polluted soil and mix thoroughly to achieve
roughly a ratio of .100parts soil to 9 parts phosphorous to 1-part nitrogen.
5) If compound D fertilizer is not available, use humus from sewage treatment plants or
animal manure to achieve close to the same ratios of contaminated soil to phosphorus
to nitrogen.
6) Compost the mixture but the beds or heap should not be more than 1metre high to
avoid soil compaction and poor aeration.
7) Ensure that the soil is kept moist and is turned every month for good mixing.
8) Take a sample of the soil for hydrocarbon analysis after every 12 weeks. Generally,
the soil remediates within six months and can be used for growing vegetation.

Revision no/ 1
Effective date Sept 2015
9) Wood shavings and similar material contaminated with hydrocarbons can be treated
as above but will require to be mixed with soil or mature compost.

5. Related Documents

5.1 ZimPhos Environmental Policy.


5.2 ZimPhos Environmental Management Plan (EMP) sections 5.3, 5.4 and 5.5.
5.3 ZimPhos Rehabilitation Plan.
5.4 EMS Manual Clause 11
5.5 ZimPhos Aspects Register

Revision no/ 1
Effective date Sept 2015
Revision no/ 1
Effective date Sept 2015

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