Different pollutants removal efficiencies and pollutants distribution with particle size of wastewater treated by CEPT process

2006 ◽  
Vol 1 (3) ◽  
Author(s):  
G. R. Xu ◽  
Y. P. Zhang ◽  
J. Gregory
Keyword(s):  
Particle Size ◽  
Removal Efficiency ◽  
Total Phosphorus ◽  
Primary Treatment ◽  
Ammonia Nitrogen ◽  
Cellulose Esters ◽  
Effective Removal ◽  
Pollutants Removal ◽  
Chemically Enhanced Primary Treatment ◽  
Very High

The removal efficiency of different pollutants of wastewater treated by Chemically Enhanced Primary Treatment (CEPT) process and pollutants distribution with particle size were studied in this paper. The distributions of contaminants with particle size were studied using synthetic cellulose esters micro-porous filtering membrane of different porous size to separate the wastewater and samples after coagulation in sequence. Turbidity, UV254, COD, total phosphorus and ammonia nitrogen of the samples were measured. The results showed that the removal efficiency of the pollutants and their distributions with particle size were closely related. For contaminants in wastewater associated with particles larger than 1.2µm, the removal efficiency was very high; on the contrary, it was difficult for CEPT to remove particles smaller than 0.2µm. The removal capabilities of CEPT also correlate to the pollutants characteristics. Therefore CEPT had effective removal efficiency for total phosphorus and pollutants associated with particles larger than 1.2µm.

Studies on the Performance of Biofilm-MBR

2014 ◽  
Vol 1030-1032 ◽  
pp. 396-399
Author(s):  
Wei Hong Jin ◽  
Cai Ling He ◽  
Feng Gao ◽  
Chen Li
Keyword(s):  
Removal Efficiency ◽  
Total Phosphorus ◽  
Membrane Fouling ◽  
Control Method ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Treatment Performance ◽  
Biological Denitrification ◽  
Pollutants Removal

MBR technology for sewage treatment has the advantages of high volumetric load, good treatment performance and so on. But the MBR technology also has the shortage of membrane fouling. So this study selected the control method of fixing combination packing added in the MBR reactor, so as to reduce the membrane pollution, at the same time in the reactor to create the environment of coexistence of anaerobic and aerobic for biological denitrification. Through the research of the pollutants removal efficiency and the membrane pollution, it was founded that this method can remove 85-95% of COD and ammonia nitrogen. Effluent COD concentration generally is about 25mg/L, and the minimum of it is less than 10 mg/L. Effluent ammonia nitrogen is generally less than 10 mg/L. The minimum effluent concentration of ammonia nitrogen was less than 1 mg/L. The removal rate of total phosphorus was between 30-45%.

scholarly journals Rotating belt sieves for primary treatment, chemically enhanced primary treatment and secondary solids separation

2017 ◽  
Vol 75 (11) ◽  
pp. 2598-2606 ◽  
Author(s):  
B. Rusten ◽  
S. S. Rathnaweera ◽  
E. Rismyhr ◽  
A. K. Sahu ◽  
J. Ntiako
Keyword(s):  
Removal Efficiency ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Primary Treatment ◽  
Biofilm Reactors ◽  
Fine Mesh ◽  
Coagulation And Flocculation ◽  
Successful Removal ◽  
Solids Separation ◽  
Chemically Enhanced Primary Treatment

Fine mesh rotating belt sieves (RBS) offer a very compact solution for removal of particles from wastewater. This paper shows examples from pilot-scale testing of primary treatment, chemically enhanced primary treatment (CEPT) and secondary solids separation of biofilm solids from moving bed biofilm reactors (MBBRs). Primary treatment using a 350 microns belt showed more than 40% removal of total suspended solids (TSS) and 30% removal of chemical oxygen demand (COD) at sieve rates as high as 160 m³/m²-h. Maximum sieve rate tested was 288 m³/m²-h and maximum particle load was 80 kg TSS/m²-h. When the filter mat on the belt increased from 10 to 55 g TSS/m², the removal efficiency for TSS increased from about 35 to 60%. CEPT is a simple and effective way of increasing the removal efficiency of RBS. Adding about 1 mg/L of cationic polymer and about 2 min of flocculation time, the removal of TSS typically increased from 40–50% without polymer to 60–70% with polymer. Using coagulation and flocculation ahead of the RBS, separation of biofilm solids was successful. Removal efficiencies of 90% TSS, 83% total P and 84% total COD were achieved with a 90 microns belt at a sieve rate of 41 m³/m²-h.

Study on Chemical Enhanced Primary Treatment of Sewage

2013 ◽  
Vol 464 ◽  
pp. 189-193
Author(s):  
Jun Hong Luo ◽  
Chong Hao Huang ◽  
Yong Zhang
Keyword(s):  
Organic Matter ◽  
Removal Efficiency ◽  
Primary Treatment ◽  
Pollution Load ◽  
Low Costs ◽  
Chemically Enhanced Primary Treatment

Chemically enhanced primary treatment (CEPT) process have advantages of low pollution load and low costs, it can greatly improve the removal efficiency of organic matter by primary treatment , so the process has been studied widely and intensively. In this thesis, the mechanism, coagulant type, dosage and precipitation time were studied.

scholarly journals FLUENT Simulation Design and Optimization of Biological Aerated Filter

2022 ◽  
Vol 2148 (1) ◽  
pp. 012037
Author(s):  
Shuqin Wang ◽  
Zhiqiang Zhang ◽  
Ning Wang ◽  
Wenqi Zhao ◽  
Chungang Yuan
Keyword(s):  
Particle Size ◽  
Dissolved Oxygen ◽  
Removal Efficiency ◽  
Ammonia Nitrogen ◽  
Design Parameters ◽  
Biological Aerated Filter ◽  
Simulation Design ◽  
Initial Concentration ◽  
Design And Optimization ◽  
Aerated Filter

Abstract In this paper, a small biological aerated filter for experimental use was designed, and a method was explored to optimize the nitrogen removal efficiency by using FLUENT software to simulate the particle size of the filler, the amount of the filler, the initial concentration of ammonia nitrogen, dissolved oxygen and other operating parameters. Through the simulation experiment, the optimal design parameters of the particle size of filler, the amount of filler, the initial concentration of ammonia nitrogen and the dissolved oxygen of the biological aerated filter are 4mm, 60%, 15% and 1.5%, respectively, when the removal efficiency of ammonia nitrogen exceeds 30% reported in the literature. It provides a reference for the experimental research and practical application of biological aerated filter (BAF) denitrification.

scholarly journals Feasibility Study on Wastewater Treatment Using Chemically Enhanced Primary Treatment

2021 ◽  
Vol 11 (3) ◽  
pp. 3917-3926
Keyword(s):  
Wastewater Treatment ◽  
Economic Evaluation ◽  
Removal Efficiency ◽  
Low Cost ◽  
Operating Cost ◽  
Cost Effective ◽  
Primary Treatment ◽  
Experimental Results ◽  
Process Economics ◽  
Chemically Enhanced Primary Treatment

A techno-economic analysis was performed to investigate wastewater treatment feasibility using chemically enhanced primary treatment (CEPT) compared to conventional primary treatment (PT). An experimental study was conducted to investigate the performance of CEPT at optimum conditions, and experimental results were used to feed the techno-economical study with required input data. The wastewater treatment was focused on reducing BOD5, COD, and TSS. The comparison between CEPT and PT was concerned with removal efficiency and process economics. CEPT process has shown better efficiency compared to PT process. The experimental work indicated that ferric chloride is the optimum coagulant agent since it is highly efficient and available at a low cost. The optimum coagulant experimental results showed that the turbidity removal efficiency was 82%, COD removal 84%, BOD removal 68.1%, and SS removal 85%. The techno-economic study was performed to investigate the feasibility of CEPT. The techno-economic evaluation indicated that CEPT is a cost-effective and technically viable process for wastewater treatment. The techno-economic evaluation indicated that CEPT is a cost-effective and technically viable process for wastewater treatment as the operating cost can be reduced by 66% compared to PT.

Ferric coagulant recovered from coagulation sludge and its recycle in chemically enhanced primary treatment

2009 ◽  
Vol 60 (1) ◽  
pp. 211-219 ◽  
Author(s):  
G. R. Xu ◽  
Z. C. Yan ◽  
N. Wang ◽  
G. B. Li
Keyword(s):  
Cost Effective ◽  
Primary Treatment ◽  
Treated Wastewater ◽  
Turbidity Removal ◽  
Wastewater Quality ◽  
Pollutants Removal ◽  
Chemically Enhanced Primary Treatment ◽  
Coagulant Recovery ◽  
Chemical Sludge ◽  
Better Than

An investigation was conducted to study the feasibility of ferric coagulant recovery from chemical sludge and its recycle in chemically enhanced primary treatment (CEPT) to make the process more cost-effective, as well as reduce sludge volume. The optimum conditions and efficiency of the acidification for ferric coagulant recovery from coagulation sludge were investigated. Experimental results showed that the recovered coagulants can be used in CEPT and the pollutants removal efficiency is similar to that of fresh coagulant, and for some aspects the effect of recovered coagulants is better than that of fresh ones, such as turbidity removal. Although some substances will be enriched during recycle, they have little effect on treated wastewater quality. Acidification condition also had significant influence on reduction of sludge volume. The efficiency of coagulant recovery had a linear relationship with sludge reduction. Experiments verify that it would be a sustainable and cost-effective way to recover ferric coagulant from coagulation sludge in water treatment and chemical wastewater treatment, and then recycle it to CEPT, as well as reduce sludge volume.

Enhanced Coagulation for Slightly Polluted Seawater Using Ferric Sulfate and Modified Diatomite

2014 ◽  
Vol 955-959 ◽  
pp. 102-107
Author(s):  
Wen Hua Wang ◽  
Lu Yang Li ◽  
Xiao Qing Zhang ◽  
Jin Quan Qiu ◽  
Jing Wang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Total Phosphorus ◽  
Ammonia Nitrogen ◽  
Ferric Sulfate ◽  
Enhanced Coagulation ◽  
Bet Analysis ◽  
Seawater Samples ◽  
Modified Diatomite

The modified diatomite was prepared by calcination and alkali washing, and the feasibility of using modified diatomite for enhanced coagulation treatment of slightly polluted seawater was investigated in this study. SEM and BET analysis showed that the raw diatomite contained impurities, which were removed after refined and purified treatment. The use of diatomite as a coagulant aid improved interparticle bridging thus incorporating the cells into flocs more efficiently, producing settleable flocs of greater density, size and strength. The enhanced coagulation with ferric sulfate and modified diatomite improved the removal efficiency of turbidity, ammonia nitrogen, total phosphorus and CODMn in seawater samples. At the optimal diatomite dosage of 60 mg/L and ferric sulfate dosage of 6 mg/L, the removal efficiency of turbidity, NH3-N, TP and CODMn reached 93.8%, 26.3%, 94.8% and 44.4% respectively. It has been proved that the enhanced coagulation through the ferric sulfate and modified diatomite, as coagulant aid and adsorbent, is more efficient and environmentally than using traditional metal coagulant only for treatment of slightly polluted seawater.

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