The effects of antecedent dry days on the nitrogen removal in layered soil infiltration systems for storm run‐off control

For unstable high water ammonia shortcomings of soil infiltration system for rural sewage, one kind of new soil infiltration systems-two-stages soil aquifer treatment (SAT) system with pre-denitrification process was designed. The results show that when the hydraulic loading is within 0.06-0.08 m3/(m2·d), the effluent CODCr and NH4+-N concentration reach GB18918-2002 level A standard, the removal rate is 91%-94% for CODCr and 95%-98% for NH4+-N. The TN concentration is below 20 mg/L, meeting GB18918-2002 level B standard, and the removal rate is 71%-75%. The TN removal is dramatically affected by reflux ratio.

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Confirmation the optimal aeration parameters for nitrogen removal and nitrous oxide emission in wastewater ecological soil infiltration systems with brown earth

Water Science & Technology ◽

10.2166/wst.2019.260 ◽

2019 ◽

Vol 80 (1) ◽

pp. 144-152 ◽

Cited By ~ 2

Author(s):

Yafei Sun ◽

Junling Pang ◽

Shiyao Wang ◽

Tingting Tao ◽

Xun Fu ◽

...

Keyword(s):

Nitrous Oxide ◽

Nitrogen Removal ◽

Emission Rate ◽

Oxygen Demand ◽

Domestic Wastewater ◽

N2o Emission ◽

Aeration Rate ◽

Soil Infiltration ◽

Aeration Time ◽

Domestic Wastewater Treatment

Abstract Nitrogen removal is an obstacle for the wide application of wastewater ecological soil infiltration (WESI) system in domestic wastewater treatment. In this study, matrix dissolved oxygen (DO), nitrogen removal and nitrous oxide (N2O) emission in aerated pilot WESI systems were investigated under different aeration times (1, 2, 3, 4 and 6 h/d) and aeration rates (1, 2, 3 and 4 L/min). The results showed that aerobic conditions in upper matrix and anoxic or anaerobic conditions in the subsequent matrix were developed in an aerated/non-aerated cycle at the optimal aeration condition of aeration time of 4 h/d and aeration rate of 3 L/min. Simultaneously, high removal efficiency of chemical oxygen demand (COD) (97.9%), NH4+-N (98.2%), total nitrogen (TN) (90.7%) and low N2O emission rate (13.2 mg/(m2 d)) were obtained. The results would provide optimal aeration parameters for application of intermittent aerated WESI systems.

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Modeling Infiltration-Runoff under Multi-Layered Soil during Rainfall

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.2392 ◽

2013 ◽

Vol 864-867 ◽

pp. 2392-2402

Author(s):

Yong De Gan ◽

Yang Wen Jia ◽

Kang Wang

Keyword(s):

Soil Surface ◽

Layered Soil ◽

Layered Soils ◽

Wetting Front ◽

Soil Columns ◽

Soil Infiltration ◽

One Dimensional ◽

Cumulative Infiltration ◽

Runoff Rate

The generalized Green-Ampt models, based on the Green-Ampt approach, is suitable for simulating infiltration into layered soils during unsteady rainfall, however, there are still some problems with using this approach. The objective of this paper is to improve the generalized Green-Ampt model, and then evaluate the performance of the generalized Green-Ampt model in modeling the infiltration-runoff into multi-layered soil during rain. Firstly, based on the generalized Green-Ampt model, we propose and improvement to the generalized Green-Ampt model to overcome deficiencies in it. Then, one-dimensional infiltration-runoff experiments during rainfall were performed in multi-layered soil columns, and the runoff rate, cumulative infiltration and wetting front distance from soil surface were calculated with the modified generalized Green-Ampt model, and compared with the observed data in the experiments. The results indicate that the modified generalized Green-Ampt model predicts the multi-layered soil infiltration-runoff process well.

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Analisis Volume Limpasan dengan Metode Green-Ampt

Jurnal Nasional Teknologi Terapan (JNTT) ◽

10.22146/jntt.42774 ◽

2019 ◽

Vol 2 (2) ◽

pp. 165

Author(s):

Rena Sempana Wahyu Putri ◽

Dian Sestining Ayu

Keyword(s):

Land Use ◽

Negative Impact ◽

Infiltration Rate ◽

Social Needs ◽

Flood Event ◽

Soil Parameters ◽

Land Conversion ◽

Soil Infiltration ◽

Moisture Condition ◽

Run Off

The development of modern era involves the economic, industrial and population growth and also increase of the social needs which cause the increase of the land needs. Land conversion which happens today has a negative impact on the environment and can damage the potency of the land use itself. One of the negative impacts of the land use conversion which are unwell planned, unwell patterned and not aware with the environment is the increased of the run-off volume due to the decrease the ability of the soil infiltration. If there is no further management of the land conversion, it will cause the increase of the annual peak discharge and has the potential to cause the flood. Green-Ampt is one of the method that can be used to analyze run-off volume by estimating capacity and infiltration rate. In Green-Ampt Method there are some parameters that affect the result of the analysis which are related to vegetal cover and soil parameters such as suction head, hydraulic conductivity, initial moisture, and saturated moisture condition of the soil. The aims of this study are to give the additional information and knowledge related to the run-off volume potency in the study area which has been conducted using Green-Ampt Method for the analysis. Hope the result can be used as the reference in management of water resources potency especially in study area, there are Sub Watershed Pogung, Kaloran and Papringan. From the analysis it is known that there is a different result between observed run-off volume and run-off volume by GreenAmpt Method. The difference of the result can occur because of the different intepretation data on both methods. Analysis by observed run-off volume shows that there are run-off for all of the flood event, while the analysis by Green-Ampt Method shows that run-off only occured in one flood event.

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