This investigation revealed the importance of B þ L amendment in the co-composting of DFSS mixed with WS and provided a feasible low cost strategy for waste treatment. This study confirmed the importance of the B þ L amendment, not only to reduce the ammonia losses and GHG emissions during the composting process but also to improve the maturity properties and agronomic value of the end-products. The lime amendment significantly reduced the extractable metals in the sludge compost, but considering this treatment's adverse effects on nitrogen loss, GHG emissions and end product quality, the 1% lime amendment is not recommended for DFSS composting. Further experiments are needed to verify the effects of B þ L amended compost on plant growth in order torender this technology viable.