· How is nitrogen removed from wastewater? Here are some of the processes: Nitrification and Denitrification With Activated Sludge The most widespread process for …

 · Nitrogen Removal in Moving Bed Sequencing Batch Reactors with Polyurethane Cube and Luffa Sponge Carrier Materials | Semantic Scholar. AbstractNitrogen …

 · By far the best process examined in this context is System B2, mainstream anaerobic treatment followed by mainstream anammox treatment. It far excels all the …

Under the same conditions, the total nitrogen, ammonia, nitrate removal rate of zeolite reed bed were 28%, 67%, 35% higher than that of gravel reed bed. The ammonia adsorption and ion exchange on zeolite and biological nitrogen removal through nitrification and denitrification were the main removal mechanism of nitrogen in the zeolite reed bed.

 · The selective removal of nitrogen-containing compounds from oil and oil fractions is of interest because of the potential deleterious impact of such compounds on products and processes. Problems caused by nitrogen-containing compounds include gum formation, acid catalyst inhibition and deactivation, acid–base pair-related corrosion, and …

 · Nitrogen could be temporarily reduced within the stream water through, for example, assimilation by plant nitrogen uptake [Howard-Williams et al., 1983] and storage of N in the sediment [Birgand et al., 2007; Svendsen and Kronvang, 1993]. The broad literature on the removal of N in streams highlighted the critical role of denitrification.

 · In this study, enhanced nitrogen removal through in situ enrichment of anammox bacteria was successfully obtained in a full-scale municipal wastewater treatment plant (WWTP). The WWTP was an anaerobic-anoxic-oxic (AAO) process and upgraded by adding moving carriers into the anoxic zone. Enhanced nit …

 · The effect of tetracycline (TC) on nitrogen removal in wastewater treatment plants has become a new problem. This study investigated the effects of TC on nitrogen removal using a Moving Bed Biofilm Reactor system. The results showed that there was no significant effect on nitrogen removal performance when the concentration of TC was 5 …

 · This study investigates removal of total nitrogen (TN) in moving bed biofilm reactor (MBBR) supported with high-density polyethylene for biofilm formation and ibuprofen (IBU) as a carbon source. At first, the microorganisms have been acclimated for 45 days. In the optimum condition, TN removal of more than 80 % was reached.

 · This study investigates removal of total nitrogen (TN) in moving bed biofilm reactor (MBBR) supported with high-density polyethylene for biofilm formation and …

 · The anammox process is considered as a revolutionary new denitrification technology. In this study, the anammox process was started in a single-stage moving bed biofilm reactor (MBBR) and the mechanism of excess removal of ammonia nitrogen was studied. At stage I (day 0-51), anammox bacteria (AnAOB) …

 · This study investigated the effects of TC on nitrogen removal using a Moving Bed Biofilm Reactor system. The results showed that there was no significant effect on nitrogen removal performance when the concentration of TC was 5 mg/L, and that the total nitrogen (TN) removal efficiency could reach 75–77%.

 · The required depth for anoxic microenvironment in biofilm decreased from 902.3 to 525.9 μm, which enhanced the growth of denitrifying bacteria and total nitrogen (TN) removal efficiency. However, decreasing aeration intensity resulted in insufficient hydraulic shear stress, which led to weak biofilm matrix structure.

 · The nitrogen removal efficiency in these systems is a function of the recycle rate, the higher the recycle the higher the removal efficiency. However, recycle requires energy, brings back dissolved oxygen from the aeration reactors, decreasing the COD that can be used for denitrification, and other factors.

The CFBBR has two fluidized beds, running as anoxic and aerobic processes to accomplish simultaneous nitrification and denitrification, with continuous liquid recirculation through the anoxic bed and the aerobic bed. ... ammonia nitrogen removal efficiencies averaged in excess of 99% at a minimum total hydraulic retention time (HRT) ...

 · Yan, C., Wang, M., Ma, T. et al. Study on the experimental performance by electrolysis-integrated ecological floating bed for nitrogen and phosphorus removal in eutrophic water.

Nitrogen is a common contaminant in natural gas and is quite difficult to remove. Nitrogen lowers the BTU value of the gas and makes it …

 · The nitrogen removal mechanisms in constructed wetlands are known to involve ammonification, nitrification-denitrification, plant uptake, and physicochemical methods such as sedimentation,...

 · 1. Introduction. Moving bed sequencing batch reactor (MBSBR) with different types of support media has generated much interest among the researchers,,,, .The …

 · Published: 01 April 2021 Nitrogen removal from ammonium- and sulfate-rich wastewater in an upflow anaerobic sludge bed reactor: performance and microbial community structure Yongli Qin, Qiaoyan Wei, Yuanyuan Zhang, Haixiang Li, Yongrong Jiang & Junjian Zheng Ecotoxicology 30, 1719–1730 ( 2021) Cite this article 499 …

The stable operation of partial nitrification and anammox (PNA) process is a challenge in nitrogen removal from extremely low-strength ammonia wastewater like sewage mainstream. A moving bed reactor with functional carriers (30% filling rate) was developed to treat a synthetic influent with 50 mg/L ammonia. The long-term operation results …

Nitrification was significant in vertical flow Cyperus bed, and the concentration of nitrate increased by a factor of 140. The horizontal flow sand bed enhanced COD removal and …

 · The TN removal increases when the influent distribution ratio changes from 1:1 to 2:1, while the best TN removal efficiency of 54.77% occurs on Day 9. Then it drops sharply when the influent distribution ratio increase to 3:1 with the lowest TN removal efficiency of 39.51% on Day 15 (Fig. 4 d).

Abstract. Nitrogen removal performance was investigated in a sequencing batch reactor (SBR) and two moving bed sequencing batch reactors (MBSBRs) containing a given …

 · Under optimal HRT was 3 h, the removal rate of nitrate nitrogen can achieve 81% and the accumulation of ammonia nitrogen can stabilize at 0.5 mg/L. The nitrite …

 · The difference might be due to the facts that: I) heterotrophic denitrification (based on the solubilized EPS and/or cell lysate) could also contribute to the N removal in our AnUSB reactor; 2)...

 · 38.1. 27.2. 28.6. The addition of immobilized denitrifying bacteria to the floating canna bed improved the removal efficiency of both TN and COD. After 5 days, the …

The maximum total nitrogen (TN) removal efficiency (78%) was achieved using an MBSBR packed with luffa sponge (LS) substrate; polyurethane (PU) cube-packed MBSBR and SBR systems followed at 71% and 62%, respectively.

Nitrogen removal in micro-polluted surface water by the combined process of a bio-filter and an ecological gravel bed was studied. Sodium acetate was added into micro-polluted surface water as carbon source and the nitrogen removal under different C/N ratio, hydraulic load and temperature were investigated.

 · The aim of the study was to evaluate the nitrogen removal and its effects on the plant's growth and leaves morphology. using two subsurface vertical flow (VF bed), with different depths (0.24 m 2 × 0.70 m; 0.24 m 2 × 0.35 m) and nitrogen load increments. The VF bed were planted with Vetiveria zizanioides, filled with light expanded clay …

In this study, a quartz sand deep bed denitrification filter (DBDF) was used to purify WWTP secondary effluent, utilizing high nitrate nitrogen concentrations and a low C/N ratio. Results show that more than 90% of nitrate nitrogen (NO 3 -N) and 75% of chemical oxygen demand (COD) could be removed by the 20th day of filtration.

 · At the beginning of the experiment, the COD removal rate was about 50%, while the NO 3-N removal rate was only 8%. This may be because the bed filter had a good filtration effect on OM, intercepting and removing part of the OM component. The results also show the removal of NO 3-N during the DBDF start-up period.

The recirculation of the effluent increased total nitrogen (TN) removal efficiency from 71% to 85%. The chemical oxygen demand (COD) and total Kjeldahl nitrogen (TKN) removal efficiencies were 95% and 98%. Nitrification was significant in vertical flow Cyperus bed, and the concentration of nitrate increased by a factor of 140.