Full‐Scale Experience for Nitrogen Removal from Piggery Waste

Abstract

The nitrogen-removal performances of three full-scale piggery wastewater treatment plants, with different organic and nitrogen loads, at the capacity ranges of 95 to 130 m 3 /d, were compared in this study. Plants 1 and 2 can be characterized as the modification of anoxic-aerobic operating systems, while an anaerobic and anoxic-aerobic system was used in plant 3. The influent piggery wastewater concentration for plant 1 was relatively lower, but with higher organic and nitrogen loads, resulting in higher chemical oxygen demand (COD) and ammonium-nitrogen in effluent. Plant 2 was operated with strong piggery wastewater, resulting in a higher operating temperature. The high temperature could inhibit the nitrifying activity in plant 2. Although plant 3 was operated with a higher influent total COD-to-total Kjeldahl nitrogen ratio (TCOD:TKN), an additional external carbon source was required to polish the final effluent to remove nitrogen. Influent COD in plant 3 was used in the anaerobic-anoxic reactor for both methane (CH 4 ) production and denitrification. Based on various mass balances, including caloric, COD, and alkalinity, the key elements for the successful nitrogen removal from the piggery waste were reactor temperature (less than 358C), influent TCOD:TKN (greater than 6), and alkalinity-to-TKN ratio (greater than 3). Water Environ. Res., 77, 381 (2005).

Deammonification Potential of Pig Slurries and Vapor Condensates from Sewage Sludge Drying—Substrate Quality and Inhibition

“…There seems to be a lack of comprehensive overviews on both pig slurry and vapor condensate quality and their systematic research on broader range of influencing factors in the international literature. The composition of pig slurry, the animal's diet, the stabling (slatted floor, straw), and possible anaerobic conversion in storage [31] as well as the amount of water used for cleaning the pig pens and any unused food can have a major influence on slurry composition [32]. Still seldom are these factors reported in studies dealing with the treatment of pig slurries, making it difficult to assess the mentioned compositions.…”

Effect of biologically mediated pH change on phosphorus removal in BNR system for piggery waste treatment

“…It has been noticed that nitrite nitrification was more easily achieved in field units because of high pH and nitrogen loads [8] and probably due to higher reactor temperature resulting in a favorable condition for nitrite accumulation. [9] This study observed that the phosphorus removal was the result of the phosphorus utilization for cellular formation and chemical precipitation as magnesium ammonium phosphate (MAP or struvite) and/or calcium hydroxylapatite (HAP).…”

Experience of Application of Natural Treatment Systems for Wastewater (NTSW) in Livestock Farms in Canary Islands

“…NTSWs evaluated are compared in Table 5 with other similar ones both on farms and domestic waters (with equal number of equivalent inhabitants) [5][6][7]36], it can be observed that similar COD removal values both in % and %/HWR are obtained with livestock effluent treatment plants [37] and the more complete the installation (NTSW Plant 3). Likewise, if the results given are compared against conventional systems, it is observed that they have comparable overall COD removal rates, and again the best installation is Plant 3 [38][39][40][41]. However, as the conventional systems are intensive in energy consumption and with shorter retention times (HRT), in all cases except for those found by [39][40][41] it can be observed that by %/HRT the conventional systems are superior to the natural systems studied, this being the weak point of these systems in terms of retention times [42][43][44][45][46].…”

“…Likewise, if the results given are compared against conventional systems, it is observed that they have comparable overall COD removal rates, and again the best installation is Plant 3 [38][39][40][41]. However, as the conventional systems are intensive in energy consumption and with shorter retention times (HRT), in all cases except for those found by [39][40][41] it can be observed that by %/HRT the conventional systems are superior to the natural systems studied, this being the weak point of these systems in terms of retention times [42][43][44][45][46].…”