We present two versions of a compact spectrograph optical scheme based on aberration-corrected concave holographic grating. It is shown that performance of a widely-known flat-field spectrograph scheme can be significantly improved by means of use of a curved detector and introduction of an additional condition of coma correction.The spectrograph provides spectral resolution up to 0.23 nm over an extended working range of 250-900 nm and can be used for fluorescence analysis of waste water.