Case analysis of biogas heat and power cogeneration in piggery wastewater treatment

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1 9 6 Vol. 9 No Chinese Journal of Environmental Engineering Jun * m 3 /d 3. 3% 38. 8% 70. % 3. 6 CSTR CSTR T 5. 4 =25. 4 grad =. 83 /m grad 2 = /m T 5. 4 = 9. 6 grad =. 44 /m grad 2 =. 06 /m CSTR X703. A Case analysis of biogas heat and power cogeneration in piggery wastewater treatment Dai Ruobin Chen Xiaoguang Ji Guangkai 2 Wu Saiming 3 Yuan Liangping 3 Xiang Xinyi Zeng Xiangliu. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and Engineering Donghua University Shanghai China 2. Office of Teaching Affairs Donghua University Shanghai China 3. Hangzhou Qingcheng Energy Environmental Protection Engineering Co. Ltd. Hangzhou China Abstract The biogas heat and power cogeneration in middle and high concentration livestock and poultry wastewater treatment is an effective means to keep the stable operation of biogas engineering over the whole year. A typical biogas heat and power cogeneration engineering in the piggery wastewater treatment was chosen as a case. On the premise of the engineering introduction the related process parameters in biogas heat and power cogeneration were calculated and analyzed via the establishment of the mathematical models. The results show that the highest biogas yield in this project is 678 m 3 /d. The efficiency of power generation is 3. 3%. The heating efficiency is 38. 8%. The total power generation efficiency is 70. %. The investment return period of this biogas engineering is 3. 6 years. The average temperature of CSTR anaerobic tank is in autumn under the ideal condition such as heat transfer uniformly as it is 5. 9 in winter. The temperature in the top of the heat exchanger T 5. 4 and the temperature gradient grad were put forward to characterize the temperature distribution in CSTR anaerobic tank. In autumn T 5. 4 =25. 4 grad =. 83 /m grad 2 =0. 80 /m. In winter T 5. 4 =9. 6 grad =. 44 /m grad 2 =. 06 /m. By means of parameter analysis to keep digestion efficiency of CSTR anaerobic reactor the stirrer should be put in the area of the heat exchanger as far as possible the input quantity should be stable. Key words piggery wastewater anaerobic digestion biogas engineering heat and power cogeneration temperature gradient ZR D dairuobin@ 63. com * cxg@ dhu. edu. cn 3-6

2 CSTR m 3. 4 m 500 m kg COD / m 3 d 7 HRT 8 d 30 d CSTR m h = 5. 4 m DN mm 5 0 CSTR UASB 2. 2 m 4. 5 m 500 m kg COD / m 3 d HRT 4 d 5 d CSTR 000 m SBR m 3 20 m 3 - SBR SBR m 2. 5 m m m 3 /d CSTR UASB Fig... Process flow SBR m 2. 3 m 5. 0 m 200 m 3 HRT 3. 0 d 2 d SBR 2 30 kw 30 m 3 /min SBR 500 m kw 2 CSTR m 2. 5 m m 0 m 4. 4 m 800 m 3

3 η = VCe 00% η % V kj/ m h α 2i m 3 /h C kj/ m e MJ /m K i % 4 η 2 = W CSTR hc ph ΔT 00% 2 CSTR VCe CSTR 5. 4 η 2 % W h m CSTR 3. m kg /h c ph 4. 2 kj / kg ΔT grad /m m 5. 4 m 3. m UASB CSTR m E grad m E = C + PE grad 2 3 A grad = Δt 6 C Δh P grad 2 = Δt 2 7 A Δh 2 Δt CSTR 0 m 5. 4 m CSTR 256 kj / m 2 h 3. 4 kj / m 2 h b i 0. m λ i h 4. 2 kj/ m 2 h Δh 0 m 5. 4 m 5. 4 m Δt 2 CSTR CSTR 5. 4 m 3. m Δh m 3. m 7. 7 m CSTR 2 tw h c ph ΔT = T - T 2 K i S i + Gρc T - T 2 4 t h T COD T 2 S i 300 m 2 COD 050 m m 2 Table Effluent water quality and removal efficiency G index COD in structures of anaerobic process m 3 ρ 000 kg /m 3 c COD mg /L COD % 4. 2 kj / kg K i kj / m 2 h CSTR UASB K i = + b i + 5 α i λ i α 2i 2. α i 203 0

4 d Fig. 2 Relationships of biogas production 72 3 generated and days during startup CSTR m 3 / d m 3 /kg 5 8 COD 30 m CSTR 50 kwh kwh CSTR CSTR 0 ~ m 5. 4 ~ 3. m 5. 4 m T m m 3 /d 80% 600 m 3 /d 40% m T 5. 4 = m 3 η = 3. 3% 9. 6 grad C UASB CSTR 200 P 5 80 m m 3 /d 50 kw kwh /d /d 600 m 3 /d 900 /d CSTR grad =. 83 /m grad 2 = /m T 5. 4 = =. 44 /m grad 2 =. 06 /m grad grad 2 CSTR 0 ~ 5. 4 m 5. 4 ~ 3. m kg /h CSTR η 2 = 38. 8% T %

5 Fig. 3 3 CSTR T 5. 4 Temperature distribution in CSTR anaerobic reactor in autumn 678 m 3 /d m 3 /kg COD % 85% 45% CSTR 38. 8% 70. % CSTR CSTR /m T 5. 4 grad 2 =. 06 /m = grad =. 83 /m grad 2 = = 9. 6 grad =. 44 /m 4 CSTR Kornboonraksa T. Lee H. S. Lee S. H. et al. Application of chemical precipitation and membrane bioreactor hybrid process for piggery wastewater treatment. Bioresource Technology CSTR Li Shulan Wu Xiaofu Liu Ying et al. Summarization for Fig. 4 Temperature distribution in CSTR anaerobic reactor in winter piggery wastewater treatment technology. Journal of Central South Forestry University in Chinese T Yu Yi Zheng Ping Chen Xiaoguang et al. Three typical grad grad 2 fermentation utilization modes of biomass energy. Bulletin 4 of Science and Technology in 0 ~ 5. 4 m Chinese 4 Song Zilin Zhang Chao Yang Gaihe et al. Comparison of grad biogas development from households and medium and largescale 5. 4 ~ 3. m grad 2 biogas plants in rural China. Renewable and Sustain- able Energy Reviews Chen Ling Zhao Lixin Ren Changshan et al. The progress and prospects of rural biogas production in China. CSTR grad Energy Policy Christy P. M. Gopinath L. R. Divya D. A review on anaerobic decomposition and enhancement of biogas production through enzymes and microorganisms. -SBR- Renewable and Sustainable Energy Reviews

6 in Chinese 0 Surendra K. C. Takara D. Hashimoto A. G. et al. Biogas as a sustainable energy source for developing countries Opportunities and challenges. Renewable and Sus- 7. tainable Energy Reviews Wang Fuhao Li Huibo Chen Xiaohua. Mesophilic sludge digestion and heat and power co-generation in Qingdao Long Mingzhu Qing Baoxiang Chen Shiyi. Calculation Maidao WWTP. China Water & Wastewater and influence factor analysis about heat transfer coefficient in Chinese of the top of vault oil tank. Journal of Petrochemical Uni- 9. versity in Chinese Pan Boshou Lu Zhi Sun Chuanzhi. Operational analysis of sludge digestion in wastewater treatment plant in Haikou city. China Water & Wastewater Zhu Wei Chen Shiyi Cui Yanyu et al. A simplified method of the tank transmission coefficient of the erect cylinder arch tank. Journal of Fushun Petroleum Institute in Chinese

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