Crude Residue Digester Solves Tank Bottom and Waste Disposal Bottle Neck

Updated: May 6, 2020

Bacteria are the most active agents in petroleum degradation. Currently, to treat petroleum waste, bioremediation is used over long periods of time to degrade hydrocarbons. Currently used in pits and open spill areas this method may also use forms of mixing, aerating and soil turning in situ to increase the surface contact time with the desired bacteria. This process is highly inefficient nor predictable as the bacteria environment is constantly changing and reducing processing ability, reliability and life cycle of the hydrocarbon digesting bacteria (Johnson et al 2018).

Technology and Process Information

Objective: To process oil sludge in compliance with Discharge Standard.

Will require oil, water and solids separation at the first stage and biological processing of solids at the second stage. If oil is not desired to be recovered, the contaminated waste can go directly to biological processing units.

Requirements are to have Total Petroleum Hydrocarbons (TPH) in solids below 1% is best achieved by biological degradation. Focus will have to be placed on the bacteria host environmental to maximize digestion behaviors. This will provide a guarranteed and preditable de contamination process with successful discharge levels.

sludge sample from the netherlands port

Digester Controlled Environment: to reach required level of TPHs and PAHs removal we offer biological processing in a proprietary pro-active digester with ultrasonic solids activation. This digester provides an optimal an controlled enviroment for the bacteria while the ultrasonic transducer pulverizes particles that become easier to digest. Now that we have found the enviroment and the optimal bacteria behavior, we can modulate the contact time of the residue in the digester. This gives flexibility to the Proprietary Digester for mixed waste intake solution without any needs of resetting or reconfiguring the equipment or process.

Processing Capacity:

Digester Modular Units: Optimal intake 80% water and 20% solids. Digester can handle any mix intake although the volume/time to processes will be according to the mix.

Built in Mobile 1 Ton/hour to 5 Ton/hour Modular Units that can stand alone or be combined in processes with other field or terminal separator systems.

Stationary Plants for Facilities: +5 Ton/Hour

resulting digestate from biological processing of hydrocarbon sludge
resulting digestate from biological processing of hydrocarbon sludge

Biodiester Design: Aerobic & Anaerobic Processing

The digester have three stages.

Stage 1 – high speed sludge activation and premixing.

Stage 2 – baffled type full digester biological processing.

Stage 3 - Separation with process water and bacteria recycling.

In comparison with others methods and digester configurations which can take weeks or months for degradation and processing, our digester design biological process retention time can be achieved in below 2 hours.

Proprietary Biological processing is a combination of active digester and proprietary bacteria mix for hydrocarbon processing. The main advantage is short retention time – instead of weeks or months, it processes oil sludge less than in one hour and guarantee TPH content below 1%.

modular digester design for petroleum waste processing on site
modular digester design for petroleum waste processing on site

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