Naturally dispersed ash components in bio-carbon composites: integrated ammonia nitrogen removal and specific surface area augment

The low-cost blue coke industrial by-product, blue coke powder was used as raw material for the production of porous carbons adsorbent by steam activating at temperature of 800°C under the atmosphere of N2 for 60 minutes. The specific surface area and pore properties of the adsorbent were characterized by using N2 adsorption-desorption isotherms. Furthermore, the adsorption effects of the adsorbent for ammonia nitrogen in coking wastewater were investigated in terms of particle size, dosage of absorbent and adsorption time. The results show that the specific surface area is 620.94m2/g, the total pore volume is 0.4442cm3/g and the average mesopore size is 4.5808nm, the adsorbent possesses predominant mesoporous structures. In aeration, the removal rate of ammonia nitrogen can reach to 39.5% under the conditions of the ammonia nitrogen concentration of 625mg/L, the dosage of adsorbent 10g/L at the adsorption time of 60 minutes.

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Removal efficiency of subsurface vertical flow constructed wetlands for different organic loads

Water Science & Technology ◽

10.2166/wst.2007.495 ◽

2007 ◽

Vol 56 (3) ◽

pp. 75-84 ◽

Cited By ~ 15

Author(s):

G. Langergraber ◽

C. Prandtstetten ◽

A. Pressl ◽

R. Rohrhofer ◽

R. Haberl

Keyword(s):

Specific Surface ◽

Surface Area ◽

Constructed Wetlands ◽

Specific Surface Area ◽

Nitrogen Concentration ◽

Specific Area ◽

Ammonia Nitrogen ◽

Vertical Flow ◽

Design Standards ◽

Vertical Flow Constructed Wetlands

Using subsurface vertical flow constructed wetlands (SSVFCWs) with intermittent loading it is possible to fulfil the stringent Austrian effluent standards regarding nitrification. For small plants (less than 500 persons) standards for ammonia nitrogen concentration have to be met at water temperatures higher than 12 °C, effluent concentrations and treatment efficiencies for organic matter have to be met the whole year around. According to the Austrian design standards the required surface area for SSVFCWs treating wastewater was 5 m2 per person. Within the first part of an Austrian research project the goal was to optimise, i.e. minimise the surface area requirement of vertical flow beds. Therefore, three SSVFCWs with a surface area of 20 m2 each have been operated in parallel. The organic loads applied were 20, 27 and 40 g COD/m2/d, which corresponds to a specific surface area requirement of 4, 3 and 2 m2 per PE, respectively. The paper compares the effluent concentrations and elimination efficiencies of the three parallel operated beds. It could be shown that a specific area demand of 4 m2 per person is suitable to be included in the revision of the Austrian design standard. Additionally it could be shown that during the warmer seasons (May–October) when the temperature of the effluent is higher than 12 °C the specific surface area might be further reduced; even 2 m2 per person has been proven to be adequate.

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Low-temperature preparation and electrochemical capacitance of WC/carbon composites with high specific surface area

Carbon ◽

10.1016/j.carbon.2007.09.032 ◽

2007 ◽

Vol 45 (14) ◽

pp. 2759-2767 ◽

Cited By ~ 24

Author(s):

Wei Liu ◽

Yasushi Soneda ◽

Masaya Kodama ◽

Junya Yamashita ◽

Hiroaki Hatori

Keyword(s):

Low Temperature ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

High Specific Surface Area ◽

Carbon Composites ◽

Electrochemical Capacitance ◽

Low Temperature Preparation ◽

Temperature Preparation

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Green Synthesis Method and Application of NaP Zeolite Prepared by Coal Gasification Coarse Slag from Ningdong, China

Applied Sciences ◽

10.3390/app10082694 ◽

2020 ◽

Vol 10 (8) ◽

pp. 2694 ◽

Cited By ~ 2

Author(s):

Wenxin Ji ◽

Shiyue Zhang ◽

Pengde Zhao ◽

Shasha Zhang ◽

Ning Feng ◽

...

Keyword(s):

Specific Surface ◽

Environmental Protection ◽

Surface Area ◽

Specific Surface Area ◽

Coal Gasification ◽

Synthesis Method ◽

Ammonia Nitrogen ◽

Raw Material ◽

Molar Ratio ◽

Crystallization Time

In view of the current and urgent environmental protection needs, the use of industrial solid waste in China’s Ningdong is becoming more and more important. In this paper, NaP zeolite with good physical properties is synthesized by using coal gasification coarse slag (CGCS) as the raw material, without the addition of a silicon and aluminum source, without the addition of a template agent, and without high-temperature calcination. Add a small amount of NaOH and deionized water to the CGCS to adjust the molar ratio to SiO2:Al2O3:Na2O:H2O = 5.2:1.0:5.0:100. The effects of aging time, crystallization temperature, and crystallization time parameters on synthetic zeolite were studied. The raw materials and the obtained zeolite were tested by XRF, XRD, SEM, FT-IR, TG-DSC, BET, and other technologies. The results show that the specific surface area of the synthesized NaP zeolite can reach 161.06 m2/g, which has the characteristics of large specific surface area, regular morphology, and high crystallinity. We obtained NaP zeolite through a simple and low-cost synthesis method. The synthesized NaP zeolite was used to simulate the removal of ammonia nitrogen in wastewater, and the optimal removal rate was 92.67%. Among them, Na+ plays an important role in the synthesis of NaP zeolite and ion exchange with NH4+. Our research provides new ideas for solving the large-scale accumulation of CGCS and treating ammonia nitrogen in industrial wastewater. Thus, it is a promising green environmental protection and “treating waste by waste” route.

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