Pre-denitrification and pre- and post-denitrification treatment of high-ammonia landfill leachate

1998 ◽  
Vol 25 (5) ◽  
pp. 854-863 ◽  
Author(s):  
D M Shiskowski ◽  
D S Mavinic
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Retention Time ◽  
Biological Process ◽  
Inorganic Nitrogen ◽  
Ammonia Removal ◽  
Leachate Treatment ◽  
High Ammonia ◽  
Solids Retention ◽  
Total Inorganic Nitrogen

This bench-scale study investigated the nitrogen-removal capabilities of two different biological process configurations treating methanogenic-state landfill leachate containing up to 1200 mg N/L of ammonia. The first configuration was a pre-denitrification system known as the modified Ludzack-Ettinger (MLE) process. Large clarifier sludge recycle flows, set to yield clarifier recycle ratios of 7:1 and 8:1, were evaluated as a means to reduce effluent NOx concentrations. A pre- and post-denitrification system, known as the four-stage Bardenpho process, was the second configuration evaluated. The MLE systems (20 day aerobic solids retention time (SRT)) were capable of producing effluent containing about 50 mg N/L of ammonia and 200-235 mg N/L of total inorganic nitrogen (ammonia + NOx) when treating leachate containing approximately 1200 mg N/L of ammonia. In contrast, effluent from the four-stage Bardenpho system contained less than 1 mg N/L of ammonia and 15 mg N/L of NOx, when treating 1100 mg N/L ammonia leachate. An aerobic number 1 SRT of 20 days (total aerobic SRT approximately equal to 40 days) was used with aerobic number 1 and clarifier sludge recycle ratios of 4:1 and 3:1, respectively. The ammonia-removal potential of both systems was clearly demonstrated but each system also showed certain disadvantages, characteristic of each process.Key words: ammonia-N, anoxic denitrification, leachate treatment, nitrification, pre-denitrification.

High ammonia landfill leachate treatment using anaerobic filter and rotating biological contactor

1995 ◽  
Vol 22 (5) ◽  
pp. 992-1000 ◽  
Author(s):  
J. Paul Henderson ◽  
James W. Atwater
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Ammonia Removal ◽  
Cod Removal ◽  
Simultaneous Nitrification And Denitrification ◽  
Leachate Treatment ◽  
Rotating Biological Contactor ◽  
Loading Rates ◽  
Anaerobic Filter ◽  
High Ammonia

A pre-denitrifying anaerobic filter and a rotating biological contactor (RBC) were used to remove nitrogen from a high ammonia landfill leachate collected from a municipal and industrial solid waste landfill in Kaohsiung, Taiwan, Republic of China. The research indicated that greater than 95% ammonia removal from high ammonia-N (2140 mg/L) leachate can be achieved with RBC ammonia-N loading rates up to 1.5 g/(m2∙d). At RBC loading rates of 1.5–3.0 g/(m2∙d), ammonia removal ranged from 80% to 90%. Nitrogen removal averaged 66%, including an estimated 54% removal in the RBC. Nitrogen removal in the RBC was the result of either simultaneous nitrification and denitrification or air stripping of ammonia in combination with nitrification. Both alkalinity consumption and COD removal results support the explanation of simultaneous nitrification and denitrification (potentially aerobic denitrification); but since RBC off-gasses were not monitored, neither theory can be confirmed. The high nitrogen removal in the RBC suggests that for this leachate the anaerobic filter was not required for ammonia and nitrogen removal. BOD and COD removal averaged 92% and 49% respectively. Key words: landfill, leachate, treatment, ammonia, rotating biological contactor (RBC), nitrification, denitrification.

The effect of ammonia loading and operating temperature on nitrification and denitrification of a high ammonia landfill leachate

1995 ◽  
Vol 22 (3) ◽  
pp. 524-534 ◽  
Author(s):  
B. D. Azevedo ◽  
D. S. Mavinic ◽  
H. D. Robinson
Keyword(s):  
Landfill Leachate ◽  
Retention Time ◽  
Operating Temperature ◽  
Ammonia Level ◽  
Nitrite Accumulation ◽  
Second Phase ◽  
Temperature Phase ◽  
High Ammonia ◽  
Solids Retention Time ◽  
Solids Retention

The effect of ammonia loading and operating temperature on the treatment of high ammonia, methanogenic, landfill leachate was investigated. Two single-sludge, nitrification–predenitrification systems were operated in parallel: one with a 10-day aerobic solids retention time, and the other with a 20-day aerobic solids retention time. The study consisted of two phases: an ammonia loading phase and a cold temperature phase. From the first phase, it was found that, at an influent leachate ammonia level of up to 1500 mg N/L, both systems produced an effluent of < 1 mg NH4-N/L and approximately 170 mg NOx−-N/L. Aerobic nitrite and anoxic "free" ammonia were both observed to increase as the ammonia loading was increased. When the influent ammonia was raised from 1500 to 2000 mg N/L, nitrification in both systems failed. During the second phase, the temperature was decreased from 20 to 10 °C while maintaining the leachate ammonia level at 1500 mg N/L. Aerobic nitrite accumulation and rising aerobic BOD5 were observed to begin at 14 °C. When the temperature was dropped from 12 to 10 °C, nitrification failed in both systems. In both cases, nitrification was re-established at 10 °C, by ceasing to waste solids and by stopping methanol addition. Key words: ammonia, biological, denitrification, landfill, leachate, nitrification, temperature, treatment.

Removal of Ammonia Nitrogen from Landfill Leachate by Ultrasound/Ultraviolet Process

2013 ◽  
Vol 448-453 ◽  
pp. 536-539
Author(s):  
Bin Liu ◽  
Xu Ya Peng ◽  
Qi Tian ◽  
Hua Zhao
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Aeration Rate ◽  
Ammonia Removal ◽  
Ultrasonic Power ◽  
High Concentration ◽  
Leachate Treatment

Landfill leachate treatment is a major problem to be solved in the field of environmental protection, and ammonia nitrogen is one of the major pollutants in landfill leachate, whose processing technology needs further improvement. In this paper, ultrasound/ultraviolet co-oxidation technology was directly applied to the treatment of high concentration landfill leachate without the pretreatment operations of dilution, filter, and adjusting the pH conditions. The results showed that: ultrasonic and ultraviolet had certain effects on the ammonia nitrogen removal, and the ammonia nitrogen removing effects became better when the ultrasonic power was greater, or the ultraviolet wavelength was shorter. When the ultrasonic power was 100 W, the ammonia nitrogen removal efficiency was 25.2%, and the UV of 254 nm could decompose 20.2% of the ammonia nitrogen in landfill leathate. In the condition of aeration, ultrasonic and ultraviolet had good synergistic effect on leachate ammonia nitrogen treatment. When the ultrasonic power was 100 W, UV wavelength was 254 nm, and the aeration rate was 150 L/h, the ammonia removal efficiency of high concentration leachate (ammonia nitrogen concentration of 1800 mg/L) reached 98.5% after 6 hours. The paper's research results provide a useful reference for the removal of landfill leachate ammonia nitrogen.

Biological nitrification and denitrification of a simulated high ammonia landfill leachate using 4-stage Bardenpho systems: system startup and acclimation

2001 ◽  
Vol 28 (1) ◽  
pp. 85-97 ◽  
Author(s):  
P Ilies ◽  
D S Mavinic
Keyword(s):  
Landfill Leachate ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Ammonia Concentration ◽  
System Stability ◽  
Leachate Treatment ◽  
Loading Rates ◽  
High Ammonia ◽  
Biological Nitrification

This research investigated the nitrogen removal capability of two biological nitrification systems, with pre- and post-denitrification, when treating a landfill leachate characterized by high ammonia concentrations and low levels of biodegradable organics. The recycle ratios of the systems were set so that, at an average influent flow of 10 L/d, the actual hydraulic retention time of the first anoxic reactor was about 1.5 h for one system and 1.7 h for the other system. The systems also operated at a first aerobic reactor actual hydraulic retention time of 3 and 3.4 h, respectively. Methanol was used as a supplementary organic carbon source for denitrification. High leachate ammonia concentrations were simulated by artificially increasing influent ammonia to about 2200 mg N/L. This paper presents an overview of initial startup and acclimation, as well as some of the direct and indirect effects of methanol addition on process performance. The reported data were collected during two runs at incrementally increasing influent ammonia concentrations. During the first run to reach 2200 mg N/L, methanol loading rates were increased concomitantly with ammonia loading rates, to match expected aerobic NOx production, using a CH3OH:NOx of about 20:1. This resulted in methanol carry-over into the first aerobic zone, enhanced aerobic heterotrophic growth, and further inhibition of the nitrifying population, already inhibited by recycling through the elevated "free" ammonia levels of the first anoxic zone. When these systems were allowed to adapt up to 14 days, rather than 7 days, initially, to each incremental ammonia increase, and with methanol loading rates subsequently changed to yield CH3OH:NOx of only 5:1, the influent ammonia concentration was increased to approximately 2200 mg N/L within 88 days from the start of the second run, without any inhibitory problems. The timing and levels of ammonia and methanol loading rate increases, with respect to each other and to the corresponding previous loading rate increase, played an important role in system stability and the onset of nitrification failure.Key words: biological treatment, high ammonia leachate treatment, denitrification, methanol, nitrification.

Bulking and Foaming Organism Control at Phoenix, AZ WWTP

1992 ◽  
Vol 26 (3-4) ◽  
pp. 461-472 ◽  
Author(s):  
O. E. Albertson ◽  
P. Hendricks
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Oxygen Transfer ◽  
Average Rate ◽  
Oxygen Transfer Efficiency ◽  
Solids Retention ◽  
Total Nitrogen Removal ◽  
The Cost ◽  
The City

A 1630 L/s activated sludge plant at Phoenix was limited to an average rate of 1050 L/s and operated, at 400-600 mg/L MLSS and 0.8-1.3 day solids retention time (SRT) due to bulking sludge and limited clarification capacity. Higher SRTs also produced uncontrolled Nocardia foaming and low dissolved oxygen due to partial nitrification. The City retained the services of a team of consultants to resolve these problems as well as to upgrade the plant to provide nitrification and total nitrogen removal. An anoxic selector design was implemented within the existing basin and the clarifiers were modified to improve inlet design and sludge transport. The modified advanced wastewater treatment (AWT) plant operating at 1450 L/s has averaged an effluent of 7.6 mg/L BOD5, 8.2 mg/L TSS, 1.3 mg/L NH4N, 4.1 mg/L NO3N and 2.9 mg/L TP. Oxygen transfer efficiency has increased about 80% in the nitrification-denitrification (NdeN) mode. The cost of modification/upgrading to AWT was approximately $730,000 and a 400 L/s increase in hydraulic capacity was realized. Upgrading costs were $5.63/m3 ($0.02/gal.)

Research on Nitrogen Removal Performance of Leachate Treatment of WSIP Reactor

2011 ◽  
Vol 55-57 ◽  
pp. 789-795
Author(s):  
Xiu Ju Duan ◽  
Qiang He ◽  
Ya Li Liu
Keyword(s):  
Nitrogen Removal ◽  
Biological Treatment ◽  
Orthogonal Experiment ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Leachate Treatment ◽  
Treatment Performance ◽  
Biomass Retention ◽  
Nitrification And Denitrification

This thesis put forward the treatment concept of “without Biomass Retention Sequential Batch Intensified Pretreatment (WSIP)” in leachate treatment, for sake of improving performance of nitrogen removal, optimizing excess water’s nutritional ratio and benefitting the follow-up aerobic biological treatment. Based on orthogonal experiment of WSIP Reactor’s leachate treatment performance, Conclusions can be drew: the removal performance of ammonia nitrogen and TN is higher of WSIP, in which short-cut nitrification and denitrification can be realized; HRT, DO and sequential period are remarkable factors of ammonia removal performance, TN removal performance and realization of short-cut nitrification and denitrification; In normal temperature, the most perfect functional parameter of WSIP Reactor is: HRT=4d, DO=0.75mg/L and sequential period is 6h.

Nitrogen removal in activated sludge systems including denitrification in secondary clarifiers

1994 ◽  
Vol 30 (6) ◽  
pp. 101-111 ◽  
Author(s):  
H. Siegrist ◽  
W. Gujer
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Secondary Clarifier ◽  
Solids Retention Time ◽  
Solids Retention ◽  
Activated Sludge Systems

Denitrification in the secondary clarifier can contribute substantially to the nitrogen removal of activated sludge systems. This is illustrated on two treatment plants with different secondary clarifier systems. A model to estimate denitrification capacity and to design activated sludge systems for nitrogen removal is developed and verified with data from two treatment plants. The model includes denitrification in the secondary clarifier, wastewater composition (soluble readily biodegradable COD, particulate degradable COD), oxygen input into the anoxic volume, temperature, and solids retention time (SRT). The influence of aerated grit chambers and primary sedimentation on denitrification is discussed.

Sign in / Sign up

Export Citation Format

Share Document