The potential application of corn steep liquor in bio-degradation of crude oil and petroleum product pollution

1: Petroleum pollution and bio-degradation technology

The leakage that occurs during the production, transportation, and storage of petroleum and petroleum products, as well as the arbitrary disposal of discarded gasoline, kerosene, and diesel, have all led to environmental pollution;

Petroleum crude oil and petroleum products are carcinogens, highly toxic to the human body, slow to remove, and highly harmful, and have become one of the main environmental problems. At present, bio-degradation, a green bio-remediation technology with low destructive, environmentally friendly, inexpensive, and low technical requirements, is widely used to solve oil pollution;

2: Why is the removal of Petroleum pollution slow?

(1) The toxic components in petroleum affect the microbial community in soil for bio-degradation, which may be the reason for slow pollutant removal.

(2) The complexation of essential inorganic nutrients (such as nitrates, phosphates, sulfates) required for microbial growth and metabolic activities with the components in petroleum prevents them from being absorbed by microorganisms, resulting in a reduction in the available nutrients for microorganisms and a decrease in their decomposition rate of petroleum pollution.

In this regard, adding nutrient rich sources such as corn steep liquor can solve the problem of nutrient limitation, improve degradation rate, and corn steep is a good choice of nutrient source due to its low price, rich nutrition, and easy access.

3: The potential of corn steep liquor application in bio-degradation of petroleum and petroleum product pollution

(1) corn steep liquor can provide nutrients such as nitrogen and phosphorus;

Nutrients are important factors for the successful bio-degradation of oil pollution, especially nitrogen and phosphorus; The effectiveness of nitrogen and phosphorus is often a limiting factor for petroleum degradation. In marine environments, the impact on bio-degradation becomes more pronounced due to the low nitrogen and phosphorus content in seawater.

Corn steep liquor powder extracted from fresh corn steep liquor, NPK 7-7-7, 35% total amino acids, 10.9% free amino acids, 43% protein, vitamins, sugars, mineral nutrients, and other bio-active molecules; Therefore, adding corn steep solids can effectively increase the available nitrogen and phosphorus content in soil and seawater, and accelerate the degradation of pollution.

(2) Corn steep powder can serve as a potential bio-stimulant;

The experiment showed that the physical and chemical state of the soil treated with CSL changed significantly; The utilization efficiency of essential nutrients such as nitrogen, phosphorus, and potassium by microorganisms has significantly increased, enhancing the degradation rate of pollutants. This is because corn steep liquor provides the nutrients and growth factors required by microbial communities for sugar phosphorylation, amino acid, nucleic acid, nucleotide synthesis, and other life activities. The presence of these nutrients can stimulate the growth and proliferation of microbial cells, accelerating the degradation of oil pollution by microbial communities.

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