Determining wash loss levels in the brown stock pulp washing line using different methods, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

The purpose of brown stock pulp washing is to remove soluble impurities from a pulp suspension, recover cooking chemicals and incinerate organics for energy recovery. Brown stock washing is a notable sub-process in chemical pulping because it has effects on the subsequent treatments of the pulp, and it is also the first step in the chemical recovery cycle. Without effective washing, the economic viability of chemical pulp production is affected.

The performance of washing can be controlled in two main ways: using wash loss, which describes the amount of washable compounds in the pulp suspension which could have been removed in washing; or the dilution factor, which represents the net amount of water that is added during washing. The amount of sodium in the pulp suspension after washing has typically been used as an indicator of wash loss, usually expressed as kg Na2SO4/oven dry ton of washed pulp. Other common measurement methods are conductivity, COD, TOC, dissolved dry solids and lignin concentration. 

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