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Analysis of the Effectiveness of Wastewater Treatment in Activated Sludge Technology with Biomass Recirculation

Józef CIUŁA
Józef CIUŁA
   | Aug 09, 2022
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Published Online: Aug 09, 2022
Page range: 123 - 134
Received: Feb 15, 2022
Accepted: Apr 20, 2022
DOI: https://doi.org/10.2478/acee-2022-0020
Keywords
© 2022 Józef CIUŁA, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Biological reactor with the system of internal and external
Biological reactor with the system of internal and external

Figure 2.

Mutual correlations for BOD5 in the wastewater treatment process
Mutual correlations for BOD5 in the wastewater treatment process

Figure 3.

Mutual correlations of COD parameters in the wastewater treatment process
Mutual correlations of COD parameters in the wastewater treatment process

Figure 4.

Mutual correlations for total suspended solids in the wastewater treatment process
Mutual correlations for total suspended solids in the wastewater treatment process

Figure 5.

Mutual correlations of total nitrogen parameters in the wastewater treatment process
Mutual correlations of total nitrogen parameters in the wastewater treatment process

Figure 6.

Mutual correlations of total phosphorus concentrations in the wastewater treatment process
Mutual correlations of total phosphorus concentrations in the wastewater treatment process

Figure 7.

Dendrogram of the effectiveness of concentration reduction to permissible values in the treated sewage
Dendrogram of the effectiveness of concentration reduction to permissible values in the treated sewage

Figure 8.

Dendrogram for the effectiveness of concentration reduction and load reduction in treated sewage
Dendrogram for the effectiveness of concentration reduction and load reduction in treated sewage

Monthly concentrations of pollutants in untreated and treated sewage in

Month Total nitrogen mgN·dm-3 BOD5 mgO2·dm-3 CODCr mgO2·dm-3 Total phosphorus mgP·dm-3 Total suspension [mg·dm-3]
  UW PTE TW UW PTE TW UW PTE TW UW PTE TW UW PTE TW
January 69.54 63.26 7.10 407 293 4.78 940 614 25.2 13.64 12.68 0.38 383 187 9.77
February 66.49 61.41 7.30 397 299 4.67 853 578 44.7 10.16 7.18 0.37 363 194 10.25
March 61.68 60.14 8.81 267 209 4.49 1109 829 42.5 8.51 7.39 0.39 435 178 10.92
April 76.33 72.10 8.54 322 276 4.09 1079 824 55.0 6.72 6.52 0.46 334 167 6.25
May 73.53 70.15 7.34 545 263 5.36 1123 796 49.5 5.39 4.83 0.43 472 192 7.15
June 44.76 39.73 4.75 310 245 3.23 521 301 23.8 3.89 2.81 0.14 337 140 6.89
July 65.28 63.77 6.44 286 263 5.72 583 466 48.1 6.35 5.08 0.23 371 158 7.53
August 62.05 59.23 6.62 390 252 4.62 1458 801 39.0 7.46 7.10 0.36 316 194 10.42
September 60.39 59.90 5.63 330 284 4.14 720 531 32.2 6.78 6.07 0.41 343 203 10.65
October 70.62 60.49 8.62 356 268 5.11 820 528 49.3 9.24 7.70 0.62 454 190 7.11
November 77.11 75.53 8.10 368 287 2.78 1160 832 49.0 9.04 7.89 0.35 343 131 9.75
December 78.58 76.82 8.23 383 291 3.04 985 793 47.8 9.14 8.04 0.36 325 124 8.76

Scope of load reduction for individual substances contained in untreated and treated sewage

No Name of substance Load in untreated sewage [kg/d] Load in treated sewage [kg/d] Reduction scope of load of a given substance [%]
1. Biochemical oxygen demand (BOD5) 9216 117 98.73
2. Chemical oxygen demand (CODCr) 23228 1065 95.41
3. Total suspension 8966 295 96.70
4. Total nitrogen 1691 168 90.06
5. Total phosphorus 193 9.1 95.28

Comparison of N-NH4+ loads at the corresponding points of the technological cycle

No Name of substance Unit Concentration value in untreated sewage Concentration value in treated sewage Scope of concentration reduction of a given substance [%] Minimum required percentage of concentration reduction of a given substance [%]
1. Biochemical oxygen demand (BOD5) mgO2·dm-3 361.64 4.45 98.77 90
2. Chemical oxygen demand (CODCr) mgO2·dm-3 942.36 1.66 99.82 75
3. Total suspension mg·dm-3 377.36 8.79 97.67 90
4. Total nitrogen mgN·dm-3 66.16 7.20 89.12 70-80
5. Total phosphorus mgP·dm-3 7.93 0.38 95.21 80
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