Production of Lightweight Ceramsite from the Yellow River Silt and its Performance Investigation in a Biological Aerated Filer (BAF) Reactor

This study discussed the possibility of employing the Yellow River Silt (YRS) as the starting materials to produce lightweight ceramisite (LWC) by a non-sintering process. Cement and sodium silicate were used as additives. The performance of the LWC serving as a biomedium in a biological aerated reactor (BAF) for hospital wastewater treatment was investigated and the optimum operation condition was studied. Results presented that: (1) YRS could be used to prepare the LWC under the propitious condition (the ratio of YRS to cement was 75:25, the percentage of sodium silicate was 7% and the curing time was 5 d); (2) LWC could be used as a packing medium in the BAF. The BAF has large removal efficiencies on COD¬cr and NH3-N when the hydraulic retention time (HRT), the ratio of air to liquid (A/L) and the height of packing medium were 6 h, 5:1 and 80 cm respectively.

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The Study on the Production of Lightweight Ceramsite from the Yellow River Silt and its Performance Investigation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.699.835 ◽

2013 ◽

Vol 699 ◽

pp. 835-840

Author(s):

Shan Ping Li ◽

Xiao Hong Cao ◽

Xiang Ru Ma ◽

Jie Xu ◽

Yan Wen Dong

Keyword(s):

Sodium Silicate ◽

Retention Time ◽

Hydraulic Retention Time ◽

Yellow River ◽

The Yellow River ◽

Curing Time ◽

Hospital Wastewater ◽

Sintering Process ◽

Removal Efficiencies

This study discussed the possibility and factors of employing the Yellow River Silt (YRS) as the starting materials to produce lightweight ceramisite (LWC) by a non-sintering process. Cement and sodium silicate were used as additives. The performance was evaluated though hospital wastewater degradation in a biological aerated reactor (BAF). Results presented that: (1) YRS could be used to prepare the LWC under the propitious condition (the ratio of YRS to cement was 75:25, the percentage of sodium silicate was 7% and the curing time was 5 d); (2) LWC could be used as a packing medium in the BAF. The BAF has large removal efficiencies on COD¬cr and NH3-N when the hydraulic retention time (HRT) and the ratio of air to liquid (A/L) were 6 h and 5:1 respectively.

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Research on the Preparation of Polyferric Silicate Chloride (PFSC) and Application on Algae Wastewater Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.154-155.230 ◽

2010 ◽

Vol 154-155 ◽

pp. 230-234 ◽

Cited By ~ 1

Author(s):

Li Ping Wang ◽

Xiao Fei Yan ◽

Xia Xu ◽

Ai Bin Xu ◽

Nai Yuan Gao

Keyword(s):

Wastewater Treatment ◽

Reaction Time ◽

Chlorophyll A ◽

Influencing Factors ◽

Sodium Silicate ◽

Silicic Acid ◽

Raw Materials ◽

Coagulation Performance ◽

Coagulation Mechanism ◽

Removal Efficiencies

A new polyferric silicate chloride(PFSC) was prepared by using sodium silicate, ferric chloride as raw materials, at the same time, its coagulation performance and the influencing factors were observed. The water containing algae was processed by PFSC coagulant and coagulation mechanism were discussed. The results showed that the best reaction time of PFSC preparation was 1h, temperature was 40°Cand Fe/Si mole ratio was 1. The removal efficiencies of chlorophyll a and turbidity were 82.40% and 94.97% respectively at 14mgFe•L-1 of dosage. Coagulation mechanism of PFSC is considered as the cooperation of oxidization/adsorption/charge-neutralization, adsorption-bridging and sweeping, which is the effect of silicic acid, iron and iron hydrolysate on the suspended particles in wastewater.

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Performance of Ozonation Process as Advanced Treatment for Antibiotics Removal in Membrane Permeate

GeoScience Engineering ◽

10.1515/gse-2016-0014 ◽

2016 ◽

Vol 62 (2) ◽

pp. 21-26 ◽

Cited By ~ 1

Author(s):

Cao Ngoc Dan Thanh ◽

Vo Thi Kim Quyen ◽

Nguyen Thanh Tin ◽

Bui Xuan Thanh

Keyword(s):

Wastewater Treatment ◽

Membrane Bioreactor ◽

Treatment Plant ◽

Advanced Treatment ◽

Antibiotic Residues ◽

Hospital Wastewater ◽

High Detection ◽

No Elimination ◽

Removal Efficiencies ◽

Ozonation Process

Abstract There was an investigation into the removal of 6 types of antibiotics from hospital wastewater through membrane bioreactor (MBR) treatment and ozonation processes. Six types of antibiotics, namely, Sulfamethoxazole (SMZ), Norfloxacin (NOR), Ciprofloxacin (CIP), Ofloxacin (OFL), Erythromycin (ERY), and Vancomycin (VAN) which had high detection frequencies in collected samples from hospital wastewater treatment plant (HWTPs). After MBR treatment, the removal efficiencies of SMZ, NOR, OFL, and ERY were 45%, 25%, 30%, and 16%, respectively. Among of them, almost no elimination was observed for CIP and VAN since their concentrations increased by 0.24 ± 0.18 (μg·l-1) and 0.83 ± 0.20 (μg·l-1), respectively. Then, residues of the antibiotics were removed from the MBR effluent by the ozonation process. The overall removal efficiencies of SMZ, NOR, CIP, OFL, ERY, and VAN were approximately 66 %, 88 %, 83 %, 80 %, 93 %, and 92 %, respectively. The reason might be depended on different ozone consumption of those antibiotics (ABS) in a range of 313 to 1681 μg ABS·gO--1. Consequently, the ozonation process performed better in the antibiotics removal (e.g. CIP and VAN) so ozonation could be considered as important support for the MBR treatment to reduce the risk of antibiotic residues.

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