Effects of the Hydraulic Retention Time on Pig Slurry Purification by Constructed Wetlands and Stabilization Ponds

Muñoz, María Ángeles; Rosales, Rosa María; Gabarrón, María; Faz, Ángel; Acosta, José A.

doi:10.1007/s11270-016-2993-x

Cited by 18 publications

(20 citation statements)

References 40 publications

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“…The separation carried out in this study by press screw separator of the solid to liquid fraction contributed to decrease organic matter content in PS, and therefore BOD 5 and COD were also decreased by 39% and 23%, respectively in the unplanted system (W1). However, higher percentages of reduction for COD (69.1%) were reported by Muñoz et al [21], which depends on the physical and chemical manure composition as well as on manure age as indicated by Møller et al [35].…”

Section: Microbial Parametersmentioning

confidence: 83%

“…Xu and Mills [63] reported average removal efficiency of a wetland for Cu and Zn, above 60%; these findings are in line with our results, over 60% for W1 (Table 1). Muñoz et al [21] registered lower values when compared to the removal efficiencies of the outlet from wetlands planted with P. australis with a similar planting frame for EC, TSS, KN, NH4 + , COD, TP, Cu and K + .…”

Section: Treatment Efficiencymentioning

confidence: 97%

“…The PS from the pretreatment module was pumped towards the inflow of the wetland. According to previous experiences [21,26], the selected hydraulic retention time (HRT) was seven days, during that period pollutants can be removed by microorganism activity, adsorption on the substrate and uptake by plants [27,28]. Finally, after seven days into the wetlands, the outflow was discharged to the storage pond ( Figure 1e).…”

Section: Horizontal Subsurface Flow Constructed Wetland Characteristicsmentioning

confidence: 99%

“…The PS was pumped to a press screw separator ( Figure 1b) with a capacity of 5 m 3 h −1 , then the liquid part was collected in the aerator tank ( Figure 1c) of 10 m 3 staying in this tank for 48 h with an intermittent aeration process, which supplied air through a compressor of 30 m 3 h −1 (Josval, Herraiz, Spain). The retention time on the aerator tank was selected following the indication of other studies [7,21], which used 48 h of retention time in aeration tanks to reduce odors in similar climatic and management conditions than this study. In addition, Zhang and Zhu [23] indicated that short-term and low-intensity aeration is important to generate minimal odor during pig slurry treatment, also contributing to the decomposition of the total and volatile solids and BOD 5 .…”

Section: Pretreatment Modulementioning

confidence: 99%

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Efficiency of an Integrated Purification System for Pig Slurry Treatment under Mediterranean Climate

et al. 2020

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The intensification of pig production is considered a risky activity for the environment when the generated pig slurry is not adequately treated. In addition, intensive agriculture practices where pig slurry is applied to the cropland could cause nitrate leaching, salinization, and soil pollution (heavy metals and pathogens), thus the development of an eco-friendly system for pig slurry treatment is essential to avoid undesirable environmental impacts. The main objective of this study was to assess the efficiency of an integrated purification system (IPS) for treating pig slurry. The system included a pretreatment module (raw pig slurry tank, phase separator, aeration tank, and settlement tank), constructed wetlands (CWs) that included an unplanted cell and a planted cell, and a storage pond (SP). Pig slurry samples from the pretreatment modules, CWs, and SP were collected in triplicate and physic-chemical and microbial analyses were performed. Results showed that the pretreatment modules decreased the total suspended solids (TSS), total nitrogen (TN), and total phosphorus (TP) concentrations in the liquid fraction. Higher total nitrogen removal was reported in the planted cell, which decreased from 4.0 g L−1 to 1.9 g L−1 in the inflow and outflow, respectively. Total efficiencies over 85% were found in the planted and unplanted cells for TSS, Kjeldahl nitrogen (KN), chemical oxygen demand (COD), and TP. Microbial parameters were eliminated after the treatment in the planted cell. Therefore, the results indicated that filtration (pretreatment), purification (constructed wetland), and bioremediation (storage pond) constituted an appropriate IPS for treating pig slurry.

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Section: Microbial Parametersmentioning

confidence: 83%

Section: Treatment Efficiencymentioning

confidence: 97%

Section: Horizontal Subsurface Flow Constructed Wetland Characteristicsmentioning

confidence: 99%

Section: Pretreatment Modulementioning

confidence: 99%

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Efficiency of an Integrated Purification System for Pig Slurry Treatment under Mediterranean Climate

et al. 2020

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“…Another research optimized constructed wetlands by using 3- and 7-day HRTs to treat wastewater from a pig farm. Seven days of HRT resulted in removal efficiencies of about 100% for total phosphorous (TP) and COD, 94.0% (NH 4 –N), and 36.6% (NO 3 ) [ 24 ]. Another study set up four wetlands to assess different hydraulic nutrient loads.…”

Section: Introductionmentioning

confidence: 99%

Removing Organic Matter and Nutrients from Pig Farm Wastewater with a Constructed Wetland System

Orozco¹,

González-Acuña²,

Saucedo-Terán³

et al. 2018

IJERPH

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Pollutants from pig farms in Mexico have caused problems in many surface water reservoirs. Growing concern has driven the search for low-cost wastewater treatment solutions. The objective of this research was to evaluate the potential of an in-series constructed wetland to remove nutrients from wastewater from a pig farm. The wetland system had a horizontal flow that consisted of three cells, the first a surface water wetland, the second a sedimentation cell, and the third a subsurface flow wetland. The vegetation used was Thypa sp. and Scirpus sp. A mix of soil with red volcanic rock (10–30 mm diameter) and yellow sand (2–8 mm diameter) was used as a substrate for the vegetation. The experiments were carried out in duplicate. Water samples were collected at the inflow and outflow of the cells. Two hydraulic retention times (HRT) (5 and 10 days) and three treatments were evaluated: 400, 800, and 1200 mg·L−1 of chemical oxygen demand (COD) concentration. Data was collected in situ for temperature, pH, dissolved oxygen (DO), electrical conductivity (EC), and total dissolved solids (TDS). COD, total Kjeldahl nitrogen (TKN), ammonia nitrogen (NH3–N), and total phosphorous (TP) were analyzed in the laboratory. The results showed that the in-series constructed wetland is a feasible system for nutrient pollutant removal, with COD removal efficiency of 76% and 80% mg·L−1 for a 5- and 10-day HRT, respectively. The removal efficiency for TKN, NH3–N, and TP reached about 70% with a 5-day HRT, while a removal of 85% was obtained with a 10-day HRT. The wetland reached the maximum removal efficiency with a 10-day HRT and an inflow load of 400 mg·L−1 of organic matter. The results indicate that HRT positively affects removal efficiency of COD and TDS. On the other hand, the HRT was not the determining factor for TP removal. Treatment one, with an initial COD concentration of 400 mg·L−1, had the highest removal of the assessed pollutants, allowing for the use of water for irrigation according to Mexican regulatory standards (NOM-001). The water quality resulting from treatments two and three (T2 = 800 mg·L−1 of COD and T3 = 1200 mg·L−1 of COD) did not comply with minimal requirements for irrigation water.

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Mechanistic understanding of the pollutant removal and transformation processes in the constructed wetland system

Malyan

Yadav

Sonkar

et al. 2021

Water Environment Research

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Constructed wetland systems (CWs) are biologically and physically engineered systems to mimic the natural wetlands which can potentially treat the wastewater from the various point and nonpoint sources of pollution. The present study aims to review the various mechanisms involved in the different types of CWs for wastewater treatment and to elucidate their role in the effective functioning of the CWs. Several physical, chemical, and biological processes substantially influence the pollutant removal efficiency of CWs. Plants species Phragmites australis, Typha latifolia, and Typha angustifolia are most widely used in CWs. The rate of nitrogen (N) removal is significantly affected by emergent vegetation cover and type of CWs. Hybrid CWs (HCWS) removal efficiency for nutrients, metals, pesticides, and other pollutants is higher than a single constructed wetland. The contaminant removal efficiency of the vertical subsurface flow constructed wetlands (VSSFCW) commonly used for the treatment of domestic and municipal wastewater ranges between 31% and 99%. Biochar/zeolite addition as substrate material further enhances the wastewater treatment of CWs. Innovative components (substrate materials, plant species) and factors (design parameters, climatic conditions) sustaining the long‐term sink of the pollutants, such as nutrients and heavy metals in the CWs should be further investigated in the future. Practitioner points Constructed wetland systems (CWs) are efficient natural treatment system for on‐site contaminants removal from wastewater. Denitrification, nitrification, microbial and plant uptake, sedimentation and adsorption are crucial pollutant removal mechanisms. Phragmites australis, Typha latifolia, and Typha angustifolia are widely used emergent plants in constructed wetlands. Hydraulic retention time (HRT), water flow regimes, substrate, plant, and microbial biomass substantially affect CWs treatment performance.

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Effects of the Hydraulic Retention Time on Pig Slurry Purification by Constructed Wetlands and Stabilization Ponds

Cited by 18 publications

References 40 publications

Efficiency of an Integrated Purification System for Pig Slurry Treatment under Mediterranean Climate

Efficiency of an Integrated Purification System for Pig Slurry Treatment under Mediterranean Climate

Removing Organic Matter and Nutrients from Pig Farm Wastewater with a Constructed Wetland System

Mechanistic understanding of the pollutant removal and transformation processes in the constructed wetland system

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