Method for extracting black printing wastewater pollutants and preparing wastewater decolorant

• Main Authors: CUI KEKAI, ZHANG BIN, LIU RONGZHAN, YUAN YULING, CAI DOUDOU, LIU KAIWEN, YU MENGNAN
• Format: Patent
• Language: Chinese; English
• Published: 25.01.2017
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a method for extracting black printing wastewater pollutants and preparing a wastewater decolorant. The method comprises the following steps: adding an acid into black plastic printing wastewater, stirring for 5-30 minutes until the pollutants aggregate, carrying out sludge-water separation by a flotation process or precipitation process, and concentrating the sludge; adding calcium ore powder and pumice granules into the concentrated sludge to regulate the specific gravity of the sludge, stirring uniformly, heating the sludge to 50-95 DEG C while stirring so as to perform dewatering, thereby obtaining a sludge block; carrying out hot pressing on the sludge block, and baking or naturally drying; heating the sludge to 450-650 in the absence of air, and keeping the temperature for 1-4 hours; cooling the sludge to 50 DEG C or below, crushing into granules, spraying a wetting agent solution, and uniformly mixing to obtain a suspension decolorant; and adding the sludge granules into the cat