Treat Phoenix River Water by Constructed Rapid Infiltration System

Xu, Wangli; Yang, Yuxue; Cheng, Cheng; Pei, Xiangjun; Luo, Jun

doi:10.2112/si73-068.1

Cited by 7 publications

(2 citation statements)

References 2 publications

(2 reference statements)

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“…The removal mechanism of the CRI system is to use the filling medium and microorganisms grown on the filling medium to adsorb, intercept, and decompose the pollutants in sewage [ 4 ]. Especially, since the CRI system has the unique structure and feeding mode, its filling medium has the aerobic, facultative, and anaerobic environment to grow abundant microorganism to allow for efficient sewage treatment [ 5 ]. As the previous practice showed, a CRI system has a significant effect on the treatment of domestic sewage in small towns [ 6 ], whose removal rates of CODcr (chemical oxygen demand determined by potassium dichromate method), NH 4 + -N, suspended solid (SS), and linear alkylbenzene sulfonates (LAS) could reach above 85%, 90%, 95%, and 95%, respectively, and has the advantages of being less energy-intensive, more environmentally-friendly, and has a remarkable economic benefit compared with the conventional treatment systems [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Potassium Chlorate on the Treatment of Domestic Sewage by Achieving Shortcut Nitrification in a Constructed Rapid Infiltration System

Fang

Yan

et al. 2018

IJERPH

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A constructed rapid infiltration (CRI) system is a new type of sewage biofilm treatment technology, but due to its anaerobic zone it lacks the carbon sources and the conditions for nitrate retention, and its nitrogen removal performance is very poor. However, a shortcut nitrification–denitrification process presents distinctive advantages, as it saves oxygen, requires less organic matter, and requires less time for denitrification compared to conventional nitrogen removal methods. Thus, if the shortcut nitrification–denitrification process could be applied to the CRI system properly, a simpler, more economic, and efficient nitrogen removal method will be obtained. However, as its reaction process shows that the first and the most important step of achieving shortcut nitrification–denitrification is to achieve shortcut nitrification, in this study we explored the feasibility to achieve shortcut nitrification, which produces nitrite as the dominant nitrogen species in effluent, by the addition of potassium chlorate (KClO3) to the influent. In an experimental CRI test system, the effects on nitrogen removal, nitrate inhibition, and nitrite accumulation were studied, and the advantages of achieving a shortcut nitrification–denitrification process were also analysed. The results showed that shortcut nitrification was successfully achieved and maintained in a CRI system by adding 5 mM KClO3 to the influent at a constant pH of 8.4. Under these conditions, the nitrite accumulation percentage was increased, while a lower concentration of 3 mM KClO3 had no obvious effect. The addition of 5mM KClO3 in influent presumably inhibited the activity of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), but inhibition of nitrite-oxidizing bacteria (NOB) was so strong that it resulted in a maximum nitrite accumulation percentage of up to over 80%. As a result, nitrite became the dominant nitrogen product in the effluent. Moreover, if the shortcut denitrification process will be achieved in the subsequent research, it could save 60.27 mg CH3OH per litre of sewage in the CRI system compared with the full denitrification process.

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Section: Introductionmentioning

confidence: 99%

Effect of Potassium Chlorate on the Treatment of Domestic Sewage by Achieving Shortcut Nitrification in a Constructed Rapid Infiltration System

Fang

Yan

et al. 2018

IJERPH

Self Cite

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“…The Constructed Rapid Infiltration System (CRIS) was developed for ecologicallyfriendly treatment of sewage and contaminated surface water, based on a rapid and simple infiltration system, by professor Zhong of China University of Geosciences (Xu et al, 2015;Xu et al, 2013). Since its development, it has been widely applied to wastewater treatment in domestic settings.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Nitrogen Removal Performance of Constructed Rapid Infiltration System (Cris)

Xu¹

2017

Appl Ecol Env Res

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Abstract. The Constructed Rapid Infiltration System (CRIS) is widely applied for wastewater treatment. In China, however, fundamental research on functionality of CRIS is lacking. We used a CRIS simulation column to treat domestic sewage under experimental conditions, allowing determination of nitrogen pollutants removal performance. The obtained results showed that CRIS can effectively remove ammonia nitrogen with the average removal rate of 82.2% but results in a relatively low removal of total nitrogen (TN) with the average removal rate of 31.9%. The reason is that the system is frequently subjected to alternation of drying and wetting, which allows effective aeration. This leads to aerobic conditions, which is incompatible with the anaerobic requirements of denitrifying bacteria. In addition, these bacteria likely lack a suitable carbon source, as organic matter is effectively removed in the upper (aerobic) layer of CRIS. Lastly, the filter material used is generally negatively charged, thus repels nitrate, which prevents its retention and results in its discharge with the outflow. As a net result, the TN removal rate is low.

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The Removal Effect of Organic Pollutants by Different Fillers in Constructed Rapid Infiltration System

Zhang

Zhu

et al. 2022

Environment and Sustainable Development

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Treat Phoenix River Water by Constructed Rapid Infiltration System

Cited by 7 publications

References 2 publications

Effect of Potassium Chlorate on the Treatment of Domestic Sewage by Achieving Shortcut Nitrification in a Constructed Rapid Infiltration System

Effect of Potassium Chlorate on the Treatment of Domestic Sewage by Achieving Shortcut Nitrification in a Constructed Rapid Infiltration System

Analysis of Nitrogen Removal Performance of Constructed Rapid Infiltration System (Cris)

The Removal Effect of Organic Pollutants by Different Fillers in Constructed Rapid Infiltration System

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