Blockchain and smart contracts are being embraced by more and more industrial practitioners in multiple domains including agriculture, manufacturing, and healthcare. As a distributed, immutable, and partly public ledger, the consortium blockchain demonstrates its potential to enable trustworthy interoperability and collaboration between organizations. However, the mismatch between the unruled software engineering practices and the increased interest of the consortium blockchain technology may pose threats to the quality of systems implemented. To mitigate the possible threats, this study takes the angle of software engineering to systematically understand the challenges and possible solutions in terms of developing and operating a consortium blockchain-based system. For this purpose, we conducted a case study on a typical consortium blockchain-based system and exhaustively collected the data by two rounds in-depth interviews on practitioners of different roles in the case project. Based on the data analysis, eight pairs of challenges and potential solutions were identified, which cover the phases of the development and operation of consortium blockchains. Moreover, we also captured two implications after further analysis of the findings, which worth the special attention of researchers in the near future, i.e. DevOps and microservices for blockchain or smart contracts.