Influence of influent pH value on nitrite accumulation in a biological aerated filter (BAF)

Hydraulic Loading ◽

The nitrite accumulation in Biological Aerated Filter (BAF) treating simulated municipal wastewater was investigated and the possibility of nitrous nitrification in low ammonia wastewater treatment was discussed. The results indicate that the lower concentration of DO was of advantage to the formation of the nitrite accumulation. When the concentration of DO was controlled to less than 0.5 mg/L, the nitrite accumulation rate can improved significantly to the maximum over 80%. By adjusting pH, nitrite accumulation can take place in BAF. When the influent pH value was 6.5 to 7, the highest nitrite accumulation rate was 57%. But long-term stable nitrite accumulation cannot be obtained only through changing influent pH value. The increasing of hydraulic loading can contribute to nitrite accumulation. When the hydraulic loading was enhanced to 10 m3/(m2•h) , the average nitrite accumulation rate can be increased by 52.5 times. When concentration of DO was 1.0 to 1.5, influent pH was 6.5 to 7 and the filtration rate was 5 m/h, the nitrite accumulation of BAF reactor was of good stability. During 60 days’ running, the nitrite accumulation rate can keep at 65% to 75% stably and obvious nitrous nitrification was found.

Nitrite accumulation in submerged biofilters - combined effects

Water Science & Technology ◽

10.2166/wst.1996.0453 ◽

1996 ◽

Vol 34 (3-4) ◽

pp. 371-378 ◽

Cited By ~ 10

Author(s):

F. Fdz-Polanco ◽

S. Villaverde ◽

P. A. Garcia

Keyword(s):

Ammonia Concentration ◽

Relative Activity ◽

Free Ammonia ◽

Effect Of Temperature ◽

Ammonia Oxidizer ◽

Ammonium Concentration ◽

Nitrite Accumulation ◽

Ammonia Inhibition ◽

The combined effect of temperature, pH and ammonium concentration over the nitrite accumulation phenomena in situations of free ammonia inhibition, their effect over the ammonia and nitrite oxidizer microorganiisms influence over the nitrification, have been studied in an Up-flow Biological Aerated Filter (UBAF). The free ammonia inhibition effect highly depends on the values of pH, temperature and ammonium concentration. For the same specific free ammonia concentration different values of temperature, pH and ammonium concentration bring about different nitrite accumulations. In conditions of no free ammonia inhibition and low values of temperature and pH, high ammonium concentrations bring about a higher relative activity of ammonia oxidizer microorganisms of the filter increases the nitratation efficiency in zones close to the outlet and will favour the nitrite accumulation in situations of free ammonia inhibition.

Study on Biological Aerated Filter (BAF) of Algae-Contained Micropolluted Water

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.340.311 ◽

2011 ◽

Vol 340 ◽

pp. 311-317

Author(s):

Wen Yi Zhang ◽

Ning Han ◽

Gang Yan ◽

Xia Xu ◽

Xiao Liang Chen

Keyword(s):

Chlorophyll A ◽

Removal Efficiency ◽

Ph Value ◽

Technical Information ◽

High Specific Surface Area ◽

Chaohu Lake ◽

Lake Basin ◽

Hydraulic Load ◽

Using NaCl modified zeolite with high specific surface area as filter media, algae-contained micropolluted water was treated with biological aerated filter (BAF) process. The removal efficiencies of the process on micro-pollutants and removal mechanism of algae-contained micropolluted water were investigated and studied. The results showed that better removal efficiency was obtained in turbidity, Chlorophyll-a, UV254, and CODMn when algae-contained micropolluted water was treated by BAF. The optimal process parameters of the treatment of algae-contained micropolluted water with BAF were gases/water ratio of 0.5~2.5, backwash cycle of 3~5 d, air/water backwash strength of 5~7 L/(m2·s), air backwash strength of 13~17 L/(m2·s), backwash time of 15~20min, temperature of 25~30°C, pH value of 7.8~8.5 and hydraulic load of 0.23~0.35 m3/(m2·h). The results of continuous running for 21 days showed that the removal efficiency of turbidity, Chlorophyll-a, UV254, and CODMn were up to 71.61%, 81.35%, 28.34% and 32.97% respectively under the conditions of these optimal parameters, and the effluent water could meet Grade II of the Drinking Water Quality Standards (CJ 3020~1993). This study could provide technical information for town water plant reconstruction of Taihu Lake and Chaohu Lake basin.

Performance of Micro-Polluted Source Water Treatment by Biological Aerated Filter with Lava Media

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.675-677.968 ◽

2014 ◽

Vol 675-677 ◽

pp. 968-971

Author(s):

Bin Wang ◽

Li Ping Qiu ◽

Li Xin Zhang ◽

Kang Xie

Keyword(s):

Ph Value ◽

Removal Rate ◽

Surface Characteristics ◽

Ammonia Nitrogen ◽

Source Water ◽

Start Up ◽

Operational Temperature ◽

Promising Treatment ◽

The performance of biological aerated filter (BAF) with lava media for the treatment of micro-polluted source water was investigated with the operational temperature 18°C, the PH value 6.29-8.35, hydraulic retention time (HRT) 30 min as well as dissolved oxygen (DO) 2-3mg/L. The results show that the lava media is a pretty carrier that has promising surface characteristics for microorganism growth and biofilm formation. The biofilter could be operated successfully in 18d, that was shorter than the ceramic and zeolite media filter in the same start-up condition. During the steady operation period, the lava media BAF performed a promising treatment performance of permanganate index, ammonia nitrogen, and turbidity removal, where as the removal rate were 46%, 97% and 62%, respectively. Moreover, the index of UV254, which partly indicates the concentration of hardly degradable substance in the micro-polluted source water, could be removed 23% in the novel media filter.