A customer with a tough application for a Positive Displacement RAS (Return Activated Sludge) Pump was experiencing high maintenance with the existing submersible unit, requiring lifting of the pump every 3-4 weeks, usually due to solids blockage. NOT a pleasant task regularly lifting from raw sewage!
Triangle replaced it with a self-priming Boerger Rotary Lobe Pump.
A useful feature of the pump is that its direction is fully reversible. The submerged filter can be unblocked by reversing the direction of the pump. Maintenance is simple: remove the lobe cover and clean! (to see just how easy, follow the pictures below):
A further inherent problem within the transfer pump station was crust build-up. The solution called for a floating draw-down rig, automatically adjusting to the effluent levels, to skim and recycle the surface sludge and sediment. The flotation unit and pipe work complete with a TT submersible macerator / mixer pump was fabricated at Triangle workshops and installed. This has been a great success.
Allen Bradley PLC’s were used for system controls & automation, the software programming written by our engineers.
ORGANIC FERTILIZER PRODUCTION PLANT DESIGN AND PROCESS
1.Receiving Dehydrated Cake (sewage sludge)
Dehydrated cake discharged from the sewage plants and business establishments is transported by dump truck to the material tank and stored.
Dehydrated cake and a large volume of compost that serves as an inoculum and a moisture adjusting medium are mixed in using a wheel loader. Thus, the optimum fermentation condition for microbial activity is prepared.
3. First Fermentation
Nitrate is present in high levels in wastewater due in part to the high nitrates present in human sewage but also from some types of industrial effluent entering the municipal sewer system.
Nitrate is also a very common contaminant in both surface water and ground water. Nitrate occurs naturally in source water as a result of decaying plants. However, there are other manmade sources of nitrate than can increase the presence of nitrate in source waters to dangerous levels. Agricultural sources of nitrates include...
Within the biological wastewater treatment sector, it can increasingly be observed that biofilm carriers are applied in so-called Moving Bed Biofilm Reactors (MBBR). Thereby, the MBBR process is not only used to great success for the purification of domestic sewage but also in the sector of industrial wastewater and aquaculture systems.
The availability of high-performance biofilm carriers, which have been developed during the recent years, is certainly one of the reasons for the increase in the application of...
A sequencing batch biofilm filter (SBBF) was applied to treat domestic sewage. The bioreactor consisted of fibrous filler in the upper part and ceramsite filter media in the lower part. The impacts of the most important factors including dissolved oxygen (DO), water temperature and hydraulic retention time (HRT) were evaluated on contaminants removal during the operation of the SBBF. Changes in DO (1.5–4.0 mg/L) and water temperature (2–30 °C) had little effect on the removal of chemical oxygen demand (COD), but...
Biorem has successfully demonstrated its high rate odour control system for biosolids exhausts at Ashbridges Bay sewage treatment plant in Toronto, Ontario. The demonstration used XLD™, a biofiltration media engineered specifically for biosolids odours. The system has achieved 95% odour removal in less than 20-s Empty Bed Residence Time (EBRT) despite high concentration of organic sulphur compounds (OSC), and has proven its effectiveness over more than 2 years of operation. OSC removal efficiencies...