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

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.

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

Water Practice & Technology ◽

10.2166/wpt.2006.047 ◽

2006 ◽

Vol 1 (3) ◽

Cited By ~ 1

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.

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Some Serious BNR Intensification: Combining cost-effective cyanide treatment, chemically-enhanced primary treatment, and advanced aeration controls to achieve nitrogen removal in a high-rate activated sludge plant.

Proceedings of the Water Environment Federation ◽

10.2175/193864716819706941 ◽

2016 ◽

Vol 2016 (11) ◽

pp. 4651-4680 ◽

Cited By ~ 1

Author(s):

Germano Salazar-Benites ◽

Christel Dyer ◽

Charles B Bott ◽

Amanda Kennedy ◽

Arba Williamson ◽

...

Keyword(s):

Activated Sludge ◽

Nitrogen Removal ◽

Cost Effective ◽

Primary Treatment ◽

High Rate ◽

Chemically Enhanced Primary Treatment

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Feasibility Study on Wastewater Treatment Using Chemically Enhanced Primary Treatment

Letters in Applied NanoBioScience ◽

10.33263/lianbs113.39173926 ◽

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.

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Evaluation of the Effects of Chemically Enhanced Primary Treatment on Landfill Leachate and Sewage Co-treatment in Publicly Owned Treatment Works

10.26434/chemrxiv.13503288.v1 ◽

2020 ◽

Author(s):

Harsh Patel ◽

Brian Brazil ◽

Helen Lou ◽

ManoJ Jha ◽

Stephanie Luster-Teasley ◽

...

Keyword(s):

Organic Matter ◽

Metal Complexes ◽

Transition Metal Complexes ◽

Landfill Leachate ◽

Primary Treatment ◽

High Dose ◽

Uv Absorbance ◽

Publicly Owned Treatment Works ◽

Chemically Enhanced Primary Treatment ◽

Better Than

The objective of this study was to evaluate the effects of CEPT for leachate and sewage co-treatment in a POTW. The results showed that ferric and aluminum coagulants remove about 54 - 74% organic matter where ferric performed better than aluminum coagulant. However, ferric coagulant was found to exacerbate the UV absorbance after coagulation at high dose due to the interaction with dissolved organic matter by forming soluble transition metal complexes. These organo-metal complexes have been found to increase the UV absorbance and this study provides the scientific background for such phenomenon.<br>

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Evaluation of the Effects of Chemically Enhanced Primary Treatment on Landfill Leachate and Sewage Co-treatment in Publicly Owned Treatment Works

10.26434/chemrxiv.13503288 ◽

2020 ◽

Author(s):

Harsh Patel ◽

Brian Brazil ◽

Helen Lou ◽

ManoJ Jha ◽

Stephanie Luster-Teasley ◽

...

Keyword(s):

Organic Matter ◽

Metal Complexes ◽

Transition Metal Complexes ◽

Landfill Leachate ◽

Primary Treatment ◽

High Dose ◽

Uv Absorbance ◽

Publicly Owned Treatment Works ◽

Chemically Enhanced Primary Treatment ◽

Better Than

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Experimental procedures characterizing transformations of wastewater organic matter in the Emscher river, Germany

Water Science & Technology ◽

10.2166/wst.1995.0233 ◽

1995 ◽

Vol 31 (7) ◽

pp. 201-212 ◽

Cited By ~ 7

Author(s):

H. Løkkegaard Bjerre ◽

T. Hvitved-Jacobsen ◽

B. Teichgräber ◽

D. te Heesen

Keyword(s):

Organic Matter ◽

Wastewater Treatment ◽

Treatment Plant ◽

Subsequent Treatment ◽

Treated Wastewater ◽

Batch Reactors ◽

River Rhine ◽

Quality Changes ◽

Ruhr District ◽

Wastewater Quality

The Emscher river in the Ruhr district, Germany, is at present acting as a large wastewater collector receiving untreated and mechanically treated wastewater. Before the Emscher flows into the river Rhine, treatment takes place in a biological wastewater treatment plant. The transformations of the organic matter in the Emscher affect the river catchment, the subsequent treatment and the river quality. This paper focuses on evaluation of methods for quantification of the microbial transformations of wastewater in the Emscher with emphasis on characterization of wastewater quality changes in terms of biodegradability of organic matter and viable biomass. The characterization is based on methods taken from the activated sludge process in wastewater treatment. Methods were evaluated on the basis of laboratory investigations of water samples from the Emscher. Incubation in batch reactors under aerobic, anoxic and anaerobic conditions were made and a case study was performed. The methods described will be used in an intensive study of wastewater transformations in the Emscher river. This study will be a basis for future investigations of wastewater quality changes in the Emscher.

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Two-stage chemical-biological treatment at Thessaloniki greater area WWTP - experiences and potentials

Water Science & Technology ◽

10.2166/wst.1995.0672 ◽

1995 ◽

Vol 32 (9-10) ◽

pp. 75-84 ◽

Cited By ~ 1

Author(s):

A. D. Andreadakis ◽

G. H. Kristensen ◽

A. Papadopoulos ◽

C. Oikonomopoulos

Keyword(s):

Biological Treatment ◽

Treatment Plant ◽

Cost Effective ◽

Primary Treatment ◽

Effective Control ◽

Two Stage ◽

Effluent Quality ◽

Filamentous Microorganisms ◽

Sludge Settling ◽

The City

The wastewater from the city of Thessaloniki is discharged without treatment to the nearby inner part of the Thessaloniki Gulf. The existing, since 1989, treatment plant offers only primary treatment and did not operate since the expected effluent quality is not suitable for safe disposal to the available recipients. Upgrading of the plant for advanced biological treatment, including seasonal nitrogen removal, is due from 1995. In the mean time, after minor modifications completed in February 1992, the existing plant was put into operation as a two-stage chemical-biological treatment plant for 40 000 m3 d−1, which corresponds to about 35% of the total sewage flow. The operational results obtained during the two years operation period are presented and evaluated. All sewage and sludge treatment units of the plant perform better than expected, with the exception of the poor sludge settling characteristics, due to severe and persistent bulking caused by excessive growth of filamentous microorganisms, particularly M. Parvicella. Effective control of the bulking problem could lead to more cost-effective operation and increased influent flows.

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Monitoring effluent quality in hypertrophic wastewater reservoirs using remote sensing

Water Science & Technology ◽

10.2166/wst.1996.0148 ◽

1996 ◽

Vol 33 (8) ◽

pp. 23-29 ◽

Cited By ~ 3

Author(s):

I. Dor ◽

N. Ben-Yosef

Keyword(s):

Water Quality ◽

Theoretical Model ◽

Principal Component ◽

Cost Effective ◽

Operational Parameters ◽

Effluent Quality ◽

Optical Images ◽

Routine Monitoring ◽

Cost Effective Method ◽

Wastewater Quality

About one hundred and fifty wastewater reservoirs store effluents for irrigation in Israel. Effluent qualities differ according to the inflowing wastewater quality, the degree of pretreatment and the operational parameters. Certain aspects of water quality like concentration of organic matter, suspended solids and chlorophyll are significantly correlated with the water column transparency and colour. Accordingly optical images of the reservoirs obtained from the SPOT satellite demonstrate pronounced differences correlated with the water quality. The analysis of satellite multispectral images is based on a theoretical model. The model calculates, using the radiation transfer equation, the volume reflectance of the water body. Satellite images of 99 reservoirs were analyzed in the chromacity space in order to classify them according to water quality. Principal Component Analysis backed by the theoretical model increases the method sensitivity. Further elaboration of this approach will lead to the establishment of a time and cost effective method for the routine monitoring of these hypertrophic wastewater reservoirs.

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