1. Q. Chen, Y. Sun, The present situation and prospect of municipal sewage sludge treatment in China, J. Changshu Inst. Technol., 30(6) (2016) 23–27.
  2. R. Derpsch, T. Friedrich, A. Kassam, H.W. Li, Current status of adoption of no-till farming in the world and some of its main benefits, Int. J. Agric. Biol. Eng., 3 (2010) 1–25.
  3. J.P. Li, Y.J. Hu, J.H. Gan, Present situation on resources utilization of sewage sludge and its potential problems in China, Appl. Mech. Mater., 448–453 (2014) 756–760.
  4. H. Jin, Study on the carrier as carbon source and its application on the treatment of low C/N wastewater, Environ. Protect. Sci., 102 (2011) 109–114.
  5. Y.L. Shi, S.F. Wang, X. Chen, Biological phosphorus and nitrogen removal in low C/N ratio domestic sewage treatment by velocity discrete biofilter, Environ. Sci. Technol., 35(11) (2012) 131–134.
  6. W.Q. Guo, S.S. Yang, W.S. Xiang, X.J. Wang, N.Q. Ren, Minimization of excess sludge production by in-situ activated sludge treatment processes - a comprehensive review, Biotechnol. Adv., 31 (2013) 1386–1396.
  7. J. Ma, Y. Zhao, H. Zhang, Y. Wei, D. Niu, X. Chai, Research on methods of sludge disposal by landfill for urban wastewater treatment plants, Water Wastewater Eng., 33 (2007) 50–53.
  8. R. Roxburgh, R. Sieger, B. Johnson, B. Rabinowitz, S. Goodwin, G. Crawford, G. Daigger, Sludge minimization technologiesdoing more to get less, Proc. Water Environ. Fed., 2006, pp. 506–525.
  9. Y. Wang, J. Li, W. Jia, N. Wang, H. Wang, S. Zhang, G. Chen, Enhanced nitrogen and phosphorus removal in the A2/O process by hydrolysis and acidification of primary sludge, Desal. Water Treat., 52 (2014) 5144–5151.
  10. Q. Feng, X. Xing, Z. Liu, Mini review on wastewater treatment technology aimed at minimization of excess sludge, Chem. Ind. Eng. Progr., 23(8) (2004) 832–836.
  11. W.Y. Liu, L.I. Jun, W.H. Song, M.A. Wen-Jin, X.D. Yang, H.E. Ji-Wen, L.I. Tong, Influence of carbon source on nitrogen and phosphorus removal by anoxic/anaerobic/aerobic process, China Water Wastewater, 25(13) (2009) 55–57.
  12. S. Okabe, Y. Oozawa, K. Hirata, Y. Watanabe, Relationship between population dynamics of nitrifiers in biofilms and reactor performance at various C:N ratios, Water Res., 30 (1996) 1563–1572.
  13. L. Yang, Investigation of nitrification by co-immobilized nitrifying bacteria and zeolite in a batch wise fluidized bed, Water Sci. Technol., 35 (1997) 169–175.
  14. C.D. Iaconi, M.D. Sanctis, S. Rossetti, C.D. Iaconi, M.D. Sanctis, S. Rossetti, R. Ramadori, SBBGR technology for minimising excess sludge production in biological processes, Water Res., 44(6) (2010) 1825–1832.
  15. L.I. De-Hao, H.J. Ling, G.Z. Gao, W.Y. Xie, Effect of dissolved oxygen on nitrogen and carbon removal in integrative A/O process, Environ. Sci. Technol., 30(11) (2007) 17–19.
  16. P. Zheng, X.Y. Xu, B.L. Hu, Theory and technology of new biological nitrogen removal, Science Press, BeiJing, 2004.
  17. Y. Wang, Y. Zhang, D. Peng, Treating municipal wastewater and reducing excess sludge by combined process of UASB + MBBR, Technol. Water Treat., 35(9) (2009) 69–72.
  18. B. Gong, Y. Wang, J. Wang, B. Gong, Y. Wang, J. Wang, Y. Dou, J. Zhou, In-situ excess sludge reduction in SBBR through uncoupling of metabolism induced by novel aeration modes. RSC Adv., 7(46) (2017) 29058–29064.
  19. P. Liang, X. Huang, Y. Qian, Y. Wei, G. Ding, Determination and comparison of sludge reduction rates caused by microfaunas’ predation, Bioresour. Technol., 97 (2006) 854–861.
  20. X. Li, X. Liu, S. Wu, A. Rasool, J. Zuo, C. Li, G. Liu, Microbial diversity and community distribution in different functional zones of continuous aerobic–anaerobic coupled process for sludge in-situ reduction, Chem. Eng. J., 257 (2014) 74–81.
  21. J. Wang, X. Li, W. Fu, S. Wu, C. Li, Treatment of artificial soybean wastewater anaerobic effluent in a continuous aerobic- anaerobic coupled (CAAC) process with excess sludge reduction, Bioresour. Technol., 126 (2012) 142–147.
  22. A. Khursheed, A.A. Kazmi, Retrospective of ecological approaches to excess sludge reduction, Water Res., 45 (2011) 4287.
  23. Q. Feng, A. Yu, L. Chu, X.H. Xing, Performance study of the reduction of excess sludge and simultaneous removal of organic carbon and nitrogen by a combination of fluidizedand fixed-bed bioreactors with different structured macro porous carriers, Biochem. Eng. J., 39 (2008) 344–352.