Lignin from paper - making waste liquor was used as slow - releasing material to potassium fertilizer , which was propitious to resources utilization and environmental protection
12.
The new - type membrane separation technology , which is challenging traditional technologies , grows up rapidly in the concentration of waste liquor in pulping , separation and purifying of lignin components , and wastewater treatment
13.
Abstract : the preparation of cuprous chloride from etching waste liquor of cupric chloride and crude copper powder was studied . the result showed that this method had many advantages , including simple process , easy operation and good quality of product , therefore it had remarkable economic and environmental benefits
