Method and device for processing wastewater containing high-concentration sodium sulfate and low molecular weight organic matter

Abstract

The invention provides a method and device for processing wastewater containing high-concentration sodium sulfate and low molecular weight organic matter. The device comprises a neutralizing tank, a turnover tank, a freezing crystalizer, a cooler, a nano-filtration unit and a biochemical reaction device; the cooler is provided with a work fluid input port, a work fluid output port, a coolant fluidinlet and a coolant fluid outlet, the neutralizing tank is in pipeline connection with the turnover tank, the freezing crystalizer is provided with a feeding inlet and a crystal pulp outlet, the workfluid output port is in pipeline connection with the feeding inlet, the crystal pulp outlet is in pipeline connection with a coolant fluid inlet, the nano-filtration unit is provided with a liquid inlet, a first liquid outlet and a second liquid outlet, the liquid inlet is in pipeline connection with the coolant fluid outlet, the first liquid outlet is in pipeline connection with the turnover tank, and the second liquid outlet is in pipeline connection with the biochemical reaction device. The problem that in cross linking etherification starch production by adopting sodium sulfate as particle expansion inhibition agent, due to the high wastewater total salt amount, a biologic method cannot be directly adopted for treatment is solved.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, and relates to a method and equipment for treating waste water containing high-concentration sodium sulfate and small molecular organic matter, and is especially suitable for the treatment of cross-linked etherified starch production waste water. Background technique [0002] Modified starch is based on the inherent characteristics of natural starch, using physical, chemical or enzymatic treatment to introduce new functional groups on starch molecules or change the size of starch molecules and the properties of starch granules, thereby changing the natural characteristics of starch. making it more suitable for specific application requirements. Chemical method is the most widely used method of starch modification. Starch hydroxyalkylation is a form of starch etherification, and crosslinking treatment is to increase the intra-molecular and intermolecular connections at random positio...

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Problems solved by technology

[0003] In order to overcome the defects in the prior art, a method and equipment for treating waste water containing high concentration sodium sulfate and small molecular organic matter are provided to solve the problem of using propylene oxide as etherification agent and phosphorus oxychloride as crosslinking agent. The waste water produced in the production of cross-linked etherified starch with sodium sulfate as the particle swelling inhibitor, due to the high total salt content of the waste water, high electrical conductivity and imbalance of C / S ratio, leads to the problem that the follow-up cannot be directly treated by biological methods

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