Enhanced phosphorus removal by microbial-collaborating sponge iron

2015 ◽  
Vol 72 (8) ◽  
pp. 1257-1265 ◽  
Author(s):  
Ya'e Wang ◽  
Jie Li ◽  
Siyuan Zhai ◽  
Zhiyong Wei ◽  
Juanjuan Feng
Keyword(s):  
Phosphorus Removal ◽  
Electrochemical Corrosion ◽  
Domestic Wastewater ◽  
Chemical Precipitation ◽  
Pilot Scale ◽  
Chemical Oxidation ◽  
Sponge Iron ◽  
Phosphorus Concentration ◽  
Total Phosphorus Concentration ◽  
Scale Experiment

The collaborative and mutually reinforcing phosphorus removal in domestic wastewater in a sponge iron and microorganisms system was studied through a laboratory and a pilot scale experiment. The results showed that the total phosphorus concentration of the effluent of less than 0.5 mg/L could be achieved. The results also support that the biochemical reaction accelerated the iron electrochemical corrosion. As a driving force, iron bacteria strengthened the chemical oxidation of Fe(II) to Fe(III). The chemical precipitation of Fe(III) is the main form of phosphorus removal. In addition, there exists adsorption phosphorus removal by phosphate-accumulating organisms. The mechanism of the enhanced phosphorus removal by microbial-collaborating sponge iron was thus proposed.

A novel anoxic–aerobic biofilter process using new composite packing material for the treatment of rural domestic wastewater

2016 ◽  
Vol 73 (10) ◽  
pp. 2486-2492 ◽  
Author(s):  
L. T. Pan ◽  
Y. Han
Keyword(s):  
Phosphorus Removal ◽  
Biological Process ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Packing Material ◽  
Chemical Processes ◽  
N Removal ◽  
Scale Experiment ◽  
Aerated Filter

A pilot scale experiment was conducted to evaluate the characteristics of contaminants removal in a continuously two-stage biological process composed of an anoxic biofilter (AF) and an biological aerated filter (BAF). This novel process was developed by introducing new composite packing material (MZF) into bioreactors to treat rural domestic wastewater. A comparative study conducted by the same process with ceramsite as packing material under the same conditions showed that a MZF system with a Fe proportion in the packing material performed better in chemical oxygen demand (COD) removal (average 91.5%), ammonia (NH4+-N) removal (average 98.3%), total nitrogen (TN) removal (average 64.8%) and total phosphorus (TP) removal (average 90%). After treatment of the MZF system, the concentrations of COD, NH4+-N, TN and TP in effluent were 20.3 mg/L, 0.5 mg/L, 11.5 mg/L and 0.3 mg/L, respectively. The simultaneously high efficiencies of nitrification, denitrification and phosphorus removal were achieved by the coupling effects of biological and chemical processes in the MZF system. The results of this study showed that the application of MZF might be a favorable choice as packing material in biofilters for treatment of rural domestic wastewater.

Modification of submerged membrane bioreactors (MBRs) by inserting baffles: pilot scale study

2007 ◽  
Vol 55 (7) ◽  
pp. 119-126 ◽  
Author(s):  
K. Kimura ◽  
M. Enomoto ◽  
Y. Watanabe
Keyword(s):  
Phosphorus Removal ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Operating Conditions ◽  
Feed Water ◽  
Simple Modification ◽  
Anoxic Conditions ◽  
Scale Experiment

Submerged membrane bioreactors (MBRs) have been gaining in popularity in various types of wastewater treatment. One drawback of submerged MBRs is difficulty in removing nitrogen as they are accompanied with intensive aeration inside the reactor and therefore principally operated under aerobic conditions. In order to address this problem, a simple modification for submerged MBRs, insertion of baffles to create alternative aerobic/anoxic conditions, was proposed. In this study, the performance of the proposed baffled membrane bioreactor (BMBR) was investigated based on a pilot-scale experiment using a real municipal wastewater. With appropriate operating conditions, the BMBR could remove more than 70% of total nitrogen contained in the feed water without any external carbon source. The BMBR demonstrated a good treatment performance in terms of TOC and phosphorus removal as well. Increase of trans-membrane pressure difference was subtle, which might be attributed to the alternative creation of aerobic/anoxic conditions.

An integrated wastewater reuse concept combining natural reclamation techniques, membrane filtration and metal oxide adsorption

2008 ◽  
Vol 57 (6) ◽  
pp. 909-914 ◽  
Author(s):  
A. Sperlich ◽  
X. Zheng ◽  
M. Jekel ◽  
M. Ernst
Keyword(s):  
Membrane Fouling ◽  
Water Reuse ◽  
Membrane Filtration ◽  
Sodium Hydroxide Solution ◽  
Wastewater Reuse ◽  
Ferric Hydroxide ◽  
Operation Time ◽  
Pilot Scale ◽  
Phosphorus Concentration ◽  
Total Phosphorus Concentration

In a Sino-German research project, a sustainable water reclamation concept was developed for different applications of municipal water reuse at the Olympic Green 2008 in Beijing, China. Results from pilot-scale experiments in Beijing and Berlin show that selective nutrient removal by adsorption onto granular ferric hydroxide (GFH) after a membrane bioreactor (MBR) can maintain a total phosphorus concentration of <0.03 μg L−1 P, thus preventing eutrophication of artificial lakes. Operation time of GFH adsorption columns can be extended by regeneration using sodium hydroxide solution. A subsequent ultrafiltration (UF) membrane after bank filtration creates an additional barrier for pathogens and allows for further urban reuse applications such as toilet flushing. Short term bank / bio-filtration prior to UF is shown to effectively remove biopolymers and reduce membrane fouling.

Comparative research on phosphorus removal by pilot-scale vertical flow constructed wetlands using steel slag and modified steel slag as substrates

2015 ◽  
Vol 71 (7) ◽  
pp. 996-1003 ◽  
Author(s):  
Yupan Yun ◽  
Xiaoqin Zhou ◽  
Zifu Li ◽  
Sayed Mohammad Nazim Uddin ◽  
Xiaofeng Bai
Keyword(s):  
Constructed Wetlands ◽  
Phosphorus Removal ◽  
Steel Slag ◽  
Pilot Scale ◽  
Phosphorus Concentration ◽  
Vertical Flow ◽  
Phosphorus Adsorption ◽  
Vertical Flow Constructed Wetlands ◽  
Low Phosphorus ◽  
Set Up

This research mainly focused on the phosphorus removal performance of pilot-scale vertical flow constructed wetlands with steel slag (SS) and modified steel slag (MSS). First, bench-scale experiments were conducted to evaluate the phosphorus adsorption capacity. Results showed that the Langmuir model could better describe the adsorption characteristics of the two materials; the maximum adsorption of MSS reached 12.7 mg/g, increasing by 34% compared to SS (9.5 mg/g). Moreover, pilot-scale constructed wetlands with SS and MSS were set up outdoors. Then, the influence of hydraulic retention time (HRT) and phosphorus concentration in phosphorus removal for two wetlands were investigated. Results revealed that better performance of the two systems could be achieved with an HRT of 2 d and phosphorus concentration in the range of 3–4.5 mg/L; the system with MSS had a better removal efficiency than the one with SS in the same control operation. Finally, the study implied that MSS could be used as a promising substrate for wetlands to treat wastewater with a high phosphorus concentration. However, considering energy consumption, SS could be regarded as a better alternative for substrate when treating sewage with a low phosphorus concentration.

scholarly journals Phosphorus Removal and Carbon Dioxide Capture in a Pilot Conventional Septic System Upgraded with a Sidestream Steel Slag Filter

2019 ◽  
Author(s):  
Dominique Claveau-Mallet ◽  
Hatim Seltani ◽  
Yves Comeau
Keyword(s):  
Carbon Dioxide ◽  
Phosphorus Removal ◽  
Carbon Dioxide Capture ◽  
Steel Slag ◽  
Experimental System ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Septic Tank ◽  
Septic System ◽  
Precipitated Calcium Carbonate

The objective of this work was to evaluate the removal of phosphorus and carbon dioxide capture of a conventional septic system upgraded with a sidestream steel slag filter used in recirculation mode. A pilot scale sidestream experiment was conducted with two septic tank and drainfield systems, one with and one without a sidestream slag filter. The experimental system was fed with real domestic wastewater. Recirculation ratios of 25%, 50% and 75% were tested. Limestone soils and silica soils were used as drainfield media. The phosphorus removal efficiency observed in the second compartment of the septic tank was 30% in the slag filter upgraded system, compared to -3% in the control system. The drainfield of silica soils achieved very high phosphorus removal in both control and upgraded systems. In the drainfield of limestone soil, the slag filtration reduced the groundwater phosphorus contamination load by up to 75%. Phosphorus removal in the septic tank with a slag filter was attributed to either sorption on newly precipitated calcium carbonate or precipitation of vivianite, or both. Recirculation ratio design criteria were proposed based on simulations. Simulations showed that the steel slag filter partly inhibited biological production of carbon dioxide in the septic tank. The influent alkalinity strongly influenced the recirculation ratio needed to raise the pH in the septic tank. The control septic tank produced carbon dioxide, whereas the slag filter upgraded septic tank was a carbon dioxide sink.

scholarly journals Application of the hydroxyapatite crystallization-filtration process to recover phosphorus from wastewater effluents

2020 ◽  
Author(s):  
Hyangyoun Chang ◽  
Nari Park ◽  
Yeoju Jang ◽  
Hyunman Lim ◽  
Weonjae Kim
Keyword(s):  
Phosphorus Removal ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Suspended Solid ◽  
Phosphorus Compounds ◽  
Filtration Process ◽  
Ft Ir ◽  
Removal Efficiencies ◽  
Pre Treatment ◽  
Treatment Step

Abstract Phosphorus crystallization-filtration (PCF) was devised as a novel tertiary process for phosphorus removal from domestic wastewater. The results obtained showed that during the PCF process, high pH and excessive calcium dosage conditions were required to obtain effluents with total phosphorus (T-P) and suspended solid (SS) concentrations below 0.2 and 10 mg/L, respectively, within 2 h of operation. Phosphorus was precipitated during the pre-treatment step, and thereafter it crystallized on the surface of the fixed seed material in the PCF reactor. Furthermore, the addition of Ca2+ resulted in phosphorus removal efficiencies >95%, and pH, residual Ca2+, filtration depth, and linear velocity were identified as the main design and operation parameters of the PCF process. Following the pilot-scale PCF process, the average concentrations of T-P, PO4-P, and SS in the effluent were 0.05, 0.04, and 1.1 mg/L, respectively, corresponding to removal efficiencies of 90.9, 86.5, and 79.7%, respectively. The investigation of the backwashing sludge characteristics of the PCF process using SEM, FT-IR, EDS, and XRD analyses showed that owing to its high contents in calcite and hydrated phosphorus compounds, PCF sludge could be used as an alternative soil amendment resource.

The use of macrophyte-based systems for phosphorus removal: an overview of 25 years of research and operational results in Florida

2001 ◽  
Vol 44 (11-12) ◽  
pp. 39-46 ◽  
Author(s):  
T.A. DeBusk ◽  
F.E. Dierberg ◽  
K.R. Reddy
Keyword(s):  
Phosphorus Removal ◽  
Aquatic Macrophyte ◽  
Domestic Wastewater ◽  
Forested Wetlands ◽  
Eutrophic Lake ◽  
Agricultural Runoff ◽  
Pilot Scale ◽  
Operational Systems ◽  
P Removal ◽  
Floating Plant

Phosphorus (P) removal from wastewaters and surface runoff using macrophyte-based systems (MBS) has been a topic of great interest in Florida for over 25 years. During this period, P removal by both treatment wetlands and floating aquatic macrophyte systems has been evaluated from both a research and operational standpoint. Several factors have contributed to the increased focus on the use of MBS for P removal. First, there exist no conventional technologies that can cost-effectively achieve the low outflow P concentrations required to protect the integrity of Florida's relatively pristine surface waters. Second, because MBSs typically provide some water storage, they can accommodate the wide ranges of flows typical for runoff sources such as agricultural drainage waters. Finally, many regions in Florida have sufficient area for deployment of the relatively land-intensive MBS technologies. The first P removal work in Florida was initiated in the mid-1970s, and involved pilot-scale research on domestic wastewater treatment by natural wetlands. Parallel studies were performed with managed (periodically harvested) floating plant systems (i.e., Eichhornia crassipes) for tertiary treatment. Since that time, the range of operational systems that have been deployed include emergent macrophyte-based and forested wetlands, managed floating plant systems, and submerged macrophyte-based systems. Waters treated by MBS include domestic effluents, agricultural runoff and eutrophic lake waters. Phosphorus removal targets for MBS in Florida have been as low as 10 μg/L. In this paper, we summarize research and operational results for MBS in Florida over the past 25 years.

scholarly journals Optimization of Wastewater Phosphorus Removal in Winter Temperatures Using an Anaerobic–Critical Aerobic Strategy in a Pilot-Scale Sequencing Batch Reactor

Water ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 110
Author(s):  
Meijun Liu ◽  
Bing Yao ◽  
Shibo Cong ◽  
Taigang Ma ◽  
Donglei Zou
Keyword(s):  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Biological Phosphorus Removal ◽  
Wastewater Remediation ◽  
Metagenome Analysis ◽  
Winter Temperatures

Biological phosphorus removal using an anaerobic–aerobic sequencing batch reactor (SBR) in a low temperature can be difficult to remove, and aeration always accounts for nearly half of the total electricity costs at many wastewater treatment plants. In this study, a pilot-scale anaerobic–critical aerobic SBR (A–CA SBR) was developed for synthetic domestic wastewater. More importantly, the phase, whose concentration of diffused oxygen was controlled at 1.0–1.5 mg/L, was defined as a critical aerobic phase, which reduced expenses during the operation. To be specific, half of the ammonia was removed within 10 days and no NO3−–N was accumulated during the process. From the SEM and metagenome analysis, Rhodocyclus, Zooglea, Dechloromonas, and Simplicispira had the ability to remove phosphorus and NO3−–N simultaneously, which proved the existence of a potential double-layer sludge structure under an A–CA operational condition. All of the results disclose that the pilot-scale A–CA SBR is a reliable manipulation strategy for phosphorus removal under low temperatures, which can hopefully apply to practical wastewater remediation.

The Effects of Chemical Precipitation by Slaked Lime on Suspended Particle Dynamics in Wastewater Ponds

1993 ◽  
Vol 28 (10) ◽  
pp. 215-222 ◽  
Author(s):  
S. J. Cripps ◽  
J. Hanæus
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Suspended Particle ◽  
Treatment Plant ◽  
Pond Water ◽  
Chemical Precipitation ◽  
Phosphorus Concentration ◽  
Total Phosphorus Concentration ◽  
Slaked Lime

Chemical precipitation can be used to treat wastewater in ponds when environmental conditions are unsuitable for biological treatment, such as during periods of low temperature or reduced solar radiation. The main purpose of this precipitation is to separate phosphorus and particulate matter from the effluent. Previous investigations have shown that most of the phosphorus leaving ponds, in which chemical precipitation by slaked lime is used, is in the particulate form. It is therefore important to identify processes that regulate the particulate content of the wastewater. An investigation was conducted to determine the particle size distribution within wastewater taken from a slaked lime settlement pond. Experiments were conducted in the second pond at the Tänndalen wastewater treatment plant in central west Sweden. Wastewater flowed into the first, volume buffering pond, then to an automatic lime feeding unit immediately prior to the second settlement pond. Water quality measurements and samples were taken at various depths and locations within the settlement pond. Changes in the particle size distribution, within a range of 1.39 to 43.30 µm diameter, using a Coulter Multisizer particle analyser, were determined. Statistics summarising these changes were related to the pH, temperature and total phosphorus concentration of the samples. The majority of particles at the effluent to the pond were so small that they were unable to settle. Improvements to the pond detention time were therefore considered unnecessary, but the initial precipitation environment at the pond influent required attention.

Removal of nitrogen and phosphorus using a new biofilm-activated-sludge system

1996 ◽  
Vol 34 (1-2) ◽  
pp. 315-322 ◽  
Author(s):  
J. X. Liu ◽  
J. W. van Groenestijn ◽  
H. J. Doddema ◽  
B. Z. Wang
Keyword(s):  
Activated Sludge ◽  
Total Phosphorus ◽  
Phosphorus Removal ◽  
Domestic Wastewater ◽  
Optimum Conditions ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
The Mean ◽  
Scale Experiment ◽  
Biological Nitrogen

This paper describes a laboratory scale experiment using a combined biofilm and activated sludge process to enhance biological nitrogen and phosphorus removal. In the system, fibrous carriers were packed in an anoxic tank for the attached growth of denitrifying bacteria and the sludge of the clarifier was returned to the anaerobic tank to release phosphate. In this configuration, nitrification, denitrification and phosphorus removal could be performed at their respective optimum conditions. The influent was domestic wastewater; the mean concentrations of COD, NH4-N and total phosphorus in the influent were about 319 mg/l, 60 mg/l and 10 mg/l respectively. At a total HRT of the system of 20-30 hours, based on the influent flow of the system, and a temperature of 10-15°C, the mean concentrations of COD, NH4-N, NO3-N, NO2-N and total phosphorus in the effluent were about 39.4 mg/l, 1.3 mg/l, 13.4 mg/l, 0.6 mg/l, and 0.8 mg/l respectively.

Sign in / Sign up

Export Citation Format

Share Document