Technological characteristics of reject waters from aerobic sludge stabilization in small and medium-sized wastewater treatment plants with biological nutrient removal

被引:0
作者
Zbigniew Mucha
Jerzy Mikosz
机构
[1] Cracow University of Technology,Division of Environmental Technologies, Faculty of Environmental and Power Engineering
来源
International Journal of Energy and Environmental Engineering | 2021年 / 12卷
关键词
Small wastewater treatment plant; Biological nutrient removal; Aerobic stabilization; Sludge processing; Reject water;
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中图分类号
学科分类号
摘要
Most studies on the impact of reject waters recycled from sludge processing in the multi-phase activated sludge process focus on anaerobic sludge treatment in large wastewater treatment plants, leaving apart the processes of aerobic sludge stabilization often used in smaller facilities in rural and suburban areas. The article presents the results of tests carried out in three small and medium-sized wastewater treatment plants with biological removal of biogenic compounds that use aerobic stabilization to process sludge. The research concerned the quantity and quality of reject waters generated in the process of aerobic stabilization and dewatering of sewage sludge and their impact on the multi-phase activated sludge process. The results showed that the average volume of generated reject waters ranged from 3.2 to 5% of the incoming wastewater volume. The average share of organic compounds and total nitrogen loads contained in reject waters did not usually exceed 5–10% of the loads in raw wastewater but reached almost 50% in the case of total phosphorus. Studies indicated that the composition of the supernatant from aerobic stabilization is strongly dependent on the course of the process. The best quality was obtained for cyclic operation of the aerobic stabilization tank with 16 h of aeration and 8 h of settling. The results also showed the negative impact of sudden discharges of reject waters from sludge processing to a multi-phase biological reactor, which can be reduced by using an appropriate equalization tank and pretreatment of the side stream to reduce the recirculation of phosphorus.
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页码:69 / 76
页数:7
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  • [1] Mucha Z(2016)Application of multi-criterial analysis to evaluate the method of utilization of sludge from small wastewater treatment plants with sustainable development of rural areas Environ. Prot. Eng. 42 97-105
  • [2] Generowicz A(2006)Problem wód osadowych i możliwości ich oczyszczania w Polsce [The problem of sludge waters and the possibility of their treatment in Poland] Gaz. Woda. Tech. Sanit. 7–8 58-62
  • [3] Wójcik W(2008)Effect of recycling of reject waters from dewatering the sludges on the operation efficiency of a wastewater treatment plant (in Polish) Przem. Chem. 87 448-452
  • [4] Jóźwiakowski K(2007)Wpływ gospodarowania wodami osadowymi na usuwanie azotu ze ścieków miejskich [Impact of sludge water management on nitrogen removal from urban wastewater] Gaz. Woda. Tech. Sanit. 9 16-20
  • [5] Baran S(2014)Validation of design assumptions for small wastewater treatment plant modernization in line with new interpretation of legal requirements Ochr. Srodowiska 36 45-49
  • [6] Ryzińska J(2016)Characteristics of reject waters and condensates generated during drying of sewage sludge from selected wastewater treatment plants Desalin. Water Treat. 66 179-192
  • [7] Gajewska M(2010)Biological sludge liquor treatment at municipal wastewater treatment plants—a review Vatten 77 553-559
  • [8] Obarska-Pempkowiak H(2005)Phosphorus release in aerobic sludge digestion Water Environ. Res. 13 43-51
  • [9] Styka W(2010)Charakterystyka odcieków z tlenowej przeróbki osadów komunalnych i przemysłowych oczyszczalniach województwa podlaskiego [Characteristics of reject water from aerobic digestion in municipal and industrial WWTPs of Podlaskie province] Inz. Ochr. Srodowiska undefined undefined-undefined
  • [10] Beńko P(2014)A study of the digestion process of sewage sludge from a dairy wastewater treatment plant to determine the composition and load of reject water Water Pract. Technol. undefined undefined-undefined