this invention reports an environmentally benign method of delignifying bleaching sequences to gain more than 80 % iso brightness for alkaline sulfite - anthraquinone wheat straw pulp comprising of aopsyp 0 , aopsep 0 and aopsp 0 p 1 sequences that yielded surprising results in the field of pulp and paper technology ; wherein the selectivity of sequences resulted in the protection of α - cellulose from degradation , produced significant drop in acid soluble lignin and yielded low viscosity losses reducing ecological impact of effluent load .