Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

The study evaluated the possibility of using mangrove plantation to treat municipal wastewater. Two types of pilot scale (100 × 150 m2) free water surface constructed wetland were set up. One system was a natural Avicennia marina dominated forest system. The other system was a newly planted system in which seedlings of Rhizophora spp., A. marina, Bruguiera cylindrica and Ceriops tagal were planted in 4 strips. Municipal wastewater was retained within the systems for 7 and 3 days, respectively. The results indicated that the average removal percentage of TSS, BOD, NO3-N, NH4-N, TN, PO4-P and TP in the newly planted system were 27.6-77.1, 43.9-53.9, 37.6-47.5, 81.1-85.9, 44.8-54.4, 24.7-76.8 and 22.6-65.3, respectively. Whereas the removal percentage of those parameters in the natural forest system were 17.1-65.9, 49.5-51.1, 44.0-60.9, 51.1-83.5, 43.4-50.4, 28.7-58.9 and 28.3-48.0, respectively. Generally, the removal percentages within the newly planted system and the natural forest system were not significantly different. However, when the removal percentages were compared with detention time, TSS, PO4-P and TP percentages removed were significantly higher in the 7-day detention time treatment. Even though the removal percentages were highly varied and temporally dependent, the overall results showed that mangrove plantation could be used as constructed wetland for municipal wastewater treatment in a similar way to the natural mangrove system.

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A proposed sustainable BNR plant with the emphasis on recovery of COD and phosphate

Water Science & Technology ◽

10.2166/wst.2003.0021 ◽

2003 ◽

Vol 48 (1) ◽

pp. 77-85 ◽

Cited By ~ 8

Author(s):

X.-D. Hao ◽

M.C.M. van Loosdrecht

Keyword(s):

Wastewater Treatment ◽

Municipal Wastewater ◽

Water Environment ◽

Pilot Scale ◽

Ammonium Oxidation ◽

Municipal Wastewater Treatment ◽

Nitrogen And Phosphorus ◽

Water Problems ◽

Sustainable Wastewater Treatment ◽

The Impact

Water problems have to be solved in an integrated way, and sustainability has become a major issue. For this reason, developing more sustainable wastewater treatment processes is needed. New discoveries and good understanding on microbial conversions of nitrogen and phosphorus make more sustainable processes possible. New options for decentralized sustainable sanitation are generally compared to conventional sewage systems, we think that for a proper comparison also innovative centralized treatment schemes should be evaluated. In this article, a more sustainable WWTP is proposed for municipal wastewater treatment, mainly based on the principles of denitrifying dephosphatation and anaerobic ammonium oxidation (ANAMMOX). The proposed system consists of a first stage of the A/B process in which maximal sludge production is achieved. In this way, COD is regained as sludge for methanation. The following BCFS® and CANON processes can remove N and P with minimal or no COD need. As a potential fertiliser, struvite can easily be removed from the sludge water by adding magnesium compounds. A case study is done on the basis of the mass balance over the proposed plant. The effluent from the system has a good quality to be recycled. This could also make a contribution to meeting the world's water needs and lessening the impact on the world's water environment. Since all the separate units are already applied or tested on pilot-scale, no problems for technical implementation are foreseen.

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Municipal Wastewater Treatment Using a Packed Bio-tower Approach

Asian Journal of Environment & Ecology ◽

10.9734/ajee/2020/v13i230179 ◽

2020 ◽

pp. 42-50

Author(s):

Klaus Doelle ◽

Qian Wang

Keyword(s):

Wastewater Treatment ◽

Flow Rate ◽

Municipal Wastewater ◽

Oxygen Demand ◽

Pilot Scale ◽

Continuous Operation ◽

Growth Media ◽

Municipal Wastewater Treatment ◽

Bacteria Growth ◽

Tower System

The study tested a designed and built pilot scale packed bio-tower system under continuous operation using pre-clarified municipal wastewater. Performance was evaluated by measuring the removal of chemical oxygen demand and nitrogen ammonia. The pilot scale packed bio-tower system had a diameter of 1209 mm (4 ft.) and a height of 3,962 mm (13 ft.) and contained Bentwood CF-1900 bacteria growth media with a surface area of 6,028.80 ft² (560.09 m²). The municipal residential sewage was fed into a 1,481 l (375 gal.) recirculation reservoir at a temperature of 15°C (59.0°F) and a flow rate between 7,571 l/d (2000 gal/d) and 90,850 l/d (24,000 gal/d) and recirculated through the bio-tower with a fixed recirculation rate of 75.7 l/min (20 gal/min). The influent COD value reduction achieved is between 63.4% and 84.8%, whereas the COD influent value varied between 87 mg/l and 140 mg/l. The influent NH3-N reduction achieved was between 99.8% and 91.8% whereas the influent NH3-N value was between 28.8 mg/l and 18.6 mg/l at a flow rate between 7571 l/d (2000 gal/d) and 90,850 l/d (24,000 gal/d).

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Municipal wastewater treatment targeting pharmaceuticals by a pilot-scale hybrid attached biofilm and activated sludge system (Hybas™)

Chemosphere ◽

10.1016/j.chemosphere.2020.127397 ◽

2020 ◽

Vol 259 ◽

pp. 127397 ◽

Cited By ~ 2

Author(s):

Kai Tang ◽

Gordon T.H. Ooi ◽

Elena Torresi ◽

Kamilla M.S. Kaarsholm ◽

Adam Hambly ◽

...

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Municipal Wastewater ◽

Pilot Scale ◽

Municipal Wastewater Treatment ◽

Activated Sludge System ◽

Treatment Targeting

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Pilot-scale demonstration of efficient ammonia removal from a high-strength municipal wastewater treatment sidestream by algal-bacterial biofilms affixed to rotating contactors

Algal Research ◽

10.1016/j.algal.2018.07.009 ◽

2018 ◽

Vol 34 ◽

pp. 143-153 ◽

Cited By ~ 4

Author(s):

Daniel B. Johnson ◽

Lance C. Schideman ◽

Thomas Canam ◽

Robert J.M. Hudson

Keyword(s):

Wastewater Treatment ◽

Municipal Wastewater ◽

High Strength ◽

Pilot Scale ◽

Ammonia Removal ◽

Bacterial Biofilms ◽

Municipal Wastewater Treatment

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Carbon footprints of Scandinavian wastewater treatment plants

Water Science & Technology ◽

10.2166/wst.2013.318 ◽

2013 ◽

Vol 68 (4) ◽

pp. 887-893 ◽

Cited By ~ 31

Author(s):

D. J. I. Gustavsson ◽

S. Tumlin

Keyword(s):

Wastewater Treatment ◽

Carbon Footprint ◽

Municipal Wastewater ◽

Wastewater Treatment Plants ◽

Biogas Production ◽

Heat Pumps ◽

Coefficient Of Performance ◽

Municipal Wastewater Treatment ◽

Carbon Footprints ◽

Fossil Carbon

This study estimates the carbon footprints of 16 municipal wastewater treatment plants (WWTPs), all situated in Scandinavian countries, by using a simple model. The carbon footprint calculations were based on operational data, literature emission factors (efs) and measurements of greenhouse gas emissions at some of the studied WWTPs. No carbon neutral WWTPs were found. The carbon footprints ranged between 7 and 108 kg CO2e P.E.−1 year−1. Generally, the major positive contributors to the carbon footprint were direct emissions of nitrous oxide from wastewater treatment. Whether heat pumps for effluents have high coefficient of performance or not is extremely important for the carbon footprint. The choice of efs largely influenced the carbon footprint. Increased biogas production, efficient biogas usage, and decreased addition of external fossil carbon source for denitrification are important activities to decrease the carbon footprint of a WWTP.

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