Iron oxide red pigment production wastewater disposal method

Abstract

The invention discloses an iron oxide red pigment production wastewater disposal method which comprises the following steps: collecting wastewater during iron oxide red pigment production for aeratingoxidizing treatment under assisted action of ultrasonic-enhanced zero-valent iron, carrying out flocculating settling on the wastewater, and then carrying out filter pressing to obtain primary filtrate and primary filter residue, wherein the filter residue is primarily iron mud; then adding crushed egg shells into the primary filtrate, and then filtering to obtain secondary filtrate and secondaryfilter residue; and carrying out high pressure reverse osmosis treatment on the secondary filtrate to obtain fresh water and concentrated water, adding a carbon source into the concentrated water, and inoculating nitrifying bacteria, standing still the mixture, settling and filtering. The method achieves cyclic utilization of the wastewater, so that zero pollution emission is achieved, and the economical benefit is improved.

Description

technical field [0001] The invention relates to a method for treating iron oxide red pigment production wastewater, and belongs to the technical field of iron oxide red pigment production. Background technique [0002] Iron oxide red, that is, iron oxide red has good color covering power, tinting power, heat resistance, solvent resistance, acid resistance, non-toxicity, anti-rust and other properties. It is a high-quality pigment variety and can be widely used in paints, inks, plastics, etc. , rubber, textiles, ceramics, art cement, cosmetics, etc. [0003] At present, the production methods of iron oxide red mainly include dry method and wet method. In the production process of preparing iron oxide red by wet method, acidic wastewater containing a large amount of ferrous ions and ammonium roots and a small amount of iron ions will be produced. This wastewater It has the characteristics of high chroma, strong acidity, high concentration of ammonia nitrogen, and high content...