From 3f40a30e999475e0e3a1b123ebd79563d37c5000 Mon Sep 17 00:00:00 2001
From: Yalin Li <mailto.yalin.li@gmail.com>
Date: Tue, 10 Dec 2024 14:31:10 -0500
Subject: [PATCH] add new attribute with biosteam update

---
 qsdsan/_sanunit.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/qsdsan/_sanunit.py b/qsdsan/_sanunit.py
index 51cac1a7..4788b965 100644
--- a/qsdsan/_sanunit.py
+++ b/qsdsan/_sanunit.py
@@ -217,6 +217,7 @@ def __init__(self, ID='', ins=None, outs=(), thermo=None, init_with='WasteStream
             self._assert_compatible_property_package()
         
         self._utility_cost = None
+        self._recycle_system = None
 
         ##### qsdsan-specific #####
         for i in (*construction, *transportation, *equipment):