Effects of intermittent-cycle extended-aeration treatment on the fate of nutrients, metals and bacterial indicators in pig slurry

被引:21
作者
Bicudo, JR [1 ]
Svoboda, IF [1 ]
机构
[1] SCOTTISH AGR COLL,DEPT BIOCHEM SCI,AUCHINCRUIVE KA6 5HW,AYR,SCOTLAND
关键词
slurry treatment; activated-sludge; nutrient removal; intermittent aeration; bacterial indicators;
D O I
10.1016/0960-8524(95)00115-8
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
A farm-scale activated sludge treatment plant for separated pig slurry was operated with four different aeration cycles during a year with the objective of optimising the process and producing an effluent with low nutrient and pathogen concentrations. The high TC nitrogen-removals observed (over 95%) appeared to be FC related to the denitrification achieved through the intermittent operation of the aerator. It was necessary to supply, on. average, about 120 kWh/day (i.e. 10 kWh/pig) in order to obtain a treated effluent with mean concentrations of 31.6 mg N-NH4/l and 77.6 mg NO3- N/l The removal of phosphorus was more variable. Percentage removals ranged from 20 to 90%. Concentrations between 25 and 60 mg PO4-P/l were obtained in the treated effluent. From the experimental data and available observations it could not be concluded whether the removal mechanism for P was predominantly chemical or biological. Mean percentage removals of metals were about 90% for Cu and 85% for Zn. Although the TS value of raw slurry indicated a large dilution of slurry (dilution factor of about 4), the initial bacterial concentrations were relatively high. About 2-3 logarithmic units reductions were observed but concentrations of the order of 10(6) faecal coliform and 10(7) faecal streptococci were still found in the final effluent.
引用
收藏
页码:63 / 72
页数:10
相关论文
共 24 条
[1]  
BATCHELOR B, 1982, J WATER POLLUT CON F, V54, P1493
[2]   SIMULATION OF SINGLE-SLUDGE NITROGEN REMOVAL [J].
BATCHELOR, B .
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE, 1983, 109 (01) :1-16
[3]  
BESNARD C, 1980, EFFLUENTS LIVESTOCK
[4]   Effect of intermittent-cycle extended-aeration treatment on the fate of carbonaceous material in pig slurry [J].
Bicudo, JR ;
Svoboda, IF .
BIORESOURCE TECHNOLOGY, 1995, 54 (01) :53-62
[5]   NITRIFICATION, DENITRIFICATION AND BIOLOGICAL PHOSPHATE REMOVAL IN SEQUENCING BATCH REACTORS TREATING PIGGERY WASTE-WATER [J].
BORTONE, G ;
GEMELLI, S ;
RAMBALDI, A ;
TILCHE, A .
WATER SCIENCE AND TECHNOLOGY, 1992, 26 (5-6) :977-985
[6]   A REVIEW OF THE STRATEGIES IN THE AEROBIC TREATMENT OF PIG SLURRY - PURPOSE, THEORY AND METHOD [J].
BURTON, CH .
JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, 1992, 53 (04) :249-272
[7]   OXIDATION-REDUCTION POTENTIAL (ORP) REGULATION - A WAY TO OPTIMIZE POLLUTION REMOVAL AND ENERGY SAVINGS IN THE LOW LOAD ACTIVATED-SLUDGE PROCESS [J].
CHARPENTIER, J ;
FLORENTZ, M ;
DAVID, G .
WATER SCIENCE AND TECHNOLOGY, 1987, 19 (3-4) :645-655
[8]  
Clesceri LS., 1989, STANDARD METHODS EXA, V17
[9]   COMPARISON OF MOST PROBABLE NUMBER AND POUR PLATE PROCEDURES FOR ISOLATION AND ENUMERATION OF SULFITE-REDUCING CLOSTRIDIUM SPORES AND GROUP-D FECAL STREPTOCOCCI FROM OYSTERS [J].
EASTERBROOK, TJ ;
WEST, PA .
JOURNAL OF APPLIED BACTERIOLOGY, 1987, 62 (05) :413-419
[10]  
HEDUIT A, 1988, WATER SUPP, V6, P275