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Decommissioning of MBR sewage treatment plant- PART 2

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In May we wrote how one of our sites is winding down and how we were partially decommissioning one of the two on-site treatment plants.

Now in September, the load has continued to fall and we have completely turned off the second plant. The first plant is handling the remaining load nicely while the second is now being emptied and prepared for removal from site.

The rest of the decommissioning process begins with normally processing as much remaining liquid until levels are too low to continue. From here, we have taken the opportunity of using the still-running plant to receive some of the liquid and sludge; what we can’t get out with a submersible pump is sucked out with a vacuum truck. By this stage, the ‘liquid’ left is a viscous black sludge sitting at the bottom of the tanks. The truck delivers this to the nearest municipality STP which have the right equipment to deal with waste sludge.

The next job will be disconnecting all the pipework and utilities, and then packing up and removing the plant. And then we’ll do it all again when the site shuts and the other remaining plant requires decommissioning- more news to come!

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SBR Biological System – Nitrogen Removal Issues

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Alpha Concepts implements changes to improve nitrogen removal on SBR Sewage Treatment Plant.

Sequence Batch Reactors (SBR) are problematic and less effective in the removal of nitrogen, particularly when nitrogen loadings are high as is experienced with mining or accommodation camps.

This week Alpha Concepts adjusted the air supply to the first aeration cell of two SBR plants that run in parallel. Air was adjusted to enable mixing; however, to reduce DO so as to create an anoxic zone. In addition sugar addition was implemented to facilitate the denitrification process.

PLC control for the site had the plants interlinked which caused process operational problems where aeration could not be adjusted for 50% of the SBR cycle. This PLC connectivity was removed allowing a greater degree of freedom of control. Aeration now represents 30% of the SBR cycle now allowing for promotion of conditions for denitrificaltion.

Stay tuned to discover the impact of these changes on reduction in total nitrogen.

If you have a problematic sewage treatment process that is consistently not achieving release parameters for total nitrogen, contact Alpha Concepts for a solution to your problem.

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Partial Decommissioning of MBR Sewage Treatment Plant

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Partial decommissioning:

Alpha Concepts is assisting a client to decommission a sewage treatment plant on a site that is reducing in regards to the wastewater generation rates. The site has two treatment plants and the waste generation rate is at a rate where on average it meets with the needs of only one plant; however, for two days per month experiences a peak load that exceeds the capability of a single treatment system.

Alpha Concepts has started a partial decommissioning process whereby one sewage treatment plant is left operational at maximum capability and a second MBR (Membrane Bio Reactor) treatment plant is being partially commissioned to meet site needs. The MBR consists of three modules, one with the UF / MBR process and two other modules incorporating fats – oil and grease separation, balance tank and system digester.

The MBR section is being decommissioned with storage of the membranes and the remaining two modules will be utilised for peak influent storage of the two days of site peak load allowing for single plant operation, optimal operational characteristics and performance and averaging monthly wastewater loadings. In essence, the scheme yields a system of low cost and high flexibility.

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