Wastewater treatment performance and sludge reduction properties of a household wastewater treatment system combined with an aerobic sludge digestion unit

Ichinari, Tsuyoshi; Ohtsubo, Akitaka; Ozawa, Tetsunori; Hasegawa, Kohji; Teduka, Keiji; Oguchi, Takehiko; Kiso, Yoshiaki

doi:10.1016/j.procbio.2008.02.016

Cited by 54 publications

(42 citation statements)

References 36 publications

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“…Thus, both daily water consumption and wastewater formation can be rather high, necessitating a wastewater treatment unit -today this is also legislated by Finnish Governmental Decree 209 [3]. This law estimates that daily wastewater loads per person should be: 2.2 g for phosphorus (P), 14 g for nitrogen (N), and 50 g for biological oxygen demand (BOD 7 ), and that it is required that these wastewaters are treated so that the reductions should be 70% (85%) for P, 30% (40%) for N, and 80% (90%) for BOD 7 . The reduction percentages in parentheses are intended to be applied to particularly sensitive areas (near surface waters or in sites used for raw water abstraction).…”

Section: Introductionmentioning

confidence: 99%

Chemical and Microbiological Quality of Effluents from Different On-Site Wastewater Treatment Systems across Finland and Sweden

Heinonen‐Tanski

Matikka

2017

Water

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Domestic wastewaters, which cannot be disposed through sewage networks, must be treated with different on-site treatment systems; these are usually commercial, small-scale treatment plants or built sand filters. These systems are usually maintained by the house's inhabitants. This study was achieved by analysing the chemical and microbiological data of 717 effluents collected in Finland and Sweden. There were inadequate reductions in 31% of phosphorus effluents, 22% of nitrogen effluents and 5% of biological oxygen demand compounds. The addition of a coagulant capable of precipitating phosphorus improved the performance of sand filters and biorotors. There are no legally binding limitations on the number of enteric microorganisms that can be present in an effluent, but the number of Escherichia coli and enterococci exceeded more than 100 colony forming units per 100 mL in 59% and 53% effluents studied, with the highest numbers for these indicators being more than 100,000 cfu per 100 mL. The number of E. coli and enterococci were lower when the concentration of phosphorus in effluent was less than 1 mg/L. The treatment efficiency varied extensively, even between similar plant models, possibly due to either irregular use, or after long pauses, when they were not being used. In addition, it is possible that the end users are not capable of properly maintaining these wastewater treatment plants.

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Section: Introductionmentioning

confidence: 99%

Chemical and Microbiological Quality of Effluents from Different On-Site Wastewater Treatment Systems across Finland and Sweden

Heinonen‐Tanski

Matikka

2017

Water

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“…Johkasou system is a household-size unit with a capacity of 1-2 m 3 per day. It composes of a primary treatment unit consisting of an anaerobic settling tank as sludge store and a down-flow anaerobic filter packed media as an anoxic process, the aerobic reactor coupled with a fixed filtration bed, and then a final settling tank and a disinfection chamber [1]. The filter packed media in the anaerobic zone and the fixed filtration bed in the oxic zone is made of polystyrene material.…”

Section: Description Of Johkasou Systemmentioning

confidence: 99%

“…Johkasou systems treat for both black and gray waters from household wastewater. The effluent of Johkasous is generally discharged into a local environmental receiving body, which the biochemical oxygen demand (BOD) and total nitrogen (TN) should be less than 20 m/L [1]. Johkasou system is considered to be an effective means for wastewater treatment in rural areas, which are designed, located and maintained satisfactorily.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aeration Rates on Removals of Organic Carbon and Nitrogen in Small Onsite Wastewater Treatment System (Johkasou)

et al. 2018

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Abstract. Onsite application of oxygen supply in domestic wastewater system may be influenced by several factors that can inhibit the oxidation and nitrification processes. In this study, the influence of aeration rate on the Johkasou performance was focused using two Johkasou facilities serving up to five persons household. In the Johkasou A (JO-A) system, we increased the aeration rate from 30 to 63 L.min -1 whereas, in the Johkasou B (JO-B), it was decreased from 59 to 34 L.min -1 . Water and sludge samples were collected from the anaerobic-anoxic-oxic zones before and after adjustment of the aeration rate measured for organic matters and nitrogen parameters. Increasing the aeration rate in JO-A resulted in a high removal of organic matter (82.5%) and nitrogen (60.3%) compared to decreasing of aeration rate in JO-B (52.0% and 33.0%, respectively). Simultaneous nitrification and denitrification (SND) exhibited a maximum percentage when the aeration rate was increased compared to decreasing of aeration rate. These results indicate that application of a high aeration rate increases removal of organic matter and nitrogen and enhances ammonia transformation. It is therefore recommended to apply high aeration rates in Johkasou system.

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“…A lot of on-site wastewater treatment processes have been developed and become popular in Japan: most of these systems are household-sized units with a capacity of 1-2 m 3 /day [3]. The disposer system combined with on-site wastewater treatment has also been studied in Japan [4] and this process is different from the disposer system widely applied in USA where disposer wastewater gets transported to the municipal WWTFs.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the pre-denitrification process like the modified Ludzack-Ettinger (MLE) process could be most pertinent to kitchen wastewater with a high COD to nitrogen ratio. Application of BNR-based activated sludge process to the disposer system has also shown successful performances [3,4]. However, in the conventional process, sludge settling often becomes problematic due to the bulking nature of sludge treating high-strength wastewater.…”

Section: Introductionmentioning

confidence: 99%

Performance and Fouling in Pre-Denitrification Membrane Bioreactors Treating High-Strength Wastewater from Food Waste Disposers

Lee

Kim

et al. 2017

Water

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Abstract:The study investigated the performance of the pre-denitrification membrane bioreactor (MBR) process to treat high-strength wastewater generated from food waste disposals. Extracellular polymeric substances (EPS) as membrane foulant and microbial community profiles were analyzed under different hydraulic retention time (HRT) operation conditions. The pre-denitrification MBR was effective for treating food wastewater with high chemical oxygen demand (COD)/N resulting in high total nitrogen (TN) removal efficiency. The operational data showed that effluent qualities in terms of COD, TN, and TP improved with longer HRT. However, membrane fouling potential as shown by specific membrane fouling rate and specific resistance to filtration (SRF) increased as HRT increased. The longer HRT conditions or lower influent loading led to higher levels of bound EPS while HRT did not show large effects on the level of soluble microbial products (SMP). The restriction fragment length polymorphism (RFLP) analysis showed similar microbial banding patterns from the sludges generated under different HRT conditions, indicating that HRT had minimal effects on the composition of microbial communities in the system. All these results suggest that the MBR with pre-denitrification is a feasible option for treating high-strength food wastewater and that different HRT conditions could affect the operational performance and the fouling rate, which is governed via changes in microbial responses through EPS in the system.

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Wastewater treatment performance and sludge reduction properties of a household wastewater treatment system combined with an aerobic sludge digestion unit

Cited by 54 publications

References 36 publications

Chemical and Microbiological Quality of Effluents from Different On-Site Wastewater Treatment Systems across Finland and Sweden

Chemical and Microbiological Quality of Effluents from Different On-Site Wastewater Treatment Systems across Finland and Sweden

Effect of Aeration Rates on Removals of Organic Carbon and Nitrogen in Small Onsite Wastewater Treatment System (Johkasou)

Performance and Fouling in Pre-Denitrification Membrane Bioreactors Treating High-Strength Wastewater from Food Waste Disposers

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