Method and apparatus for pretreatment of wastewater streams by chemical oxidation
AssigneeMPR Services, Inc.
InventorMark K. Vineyard
Life of this patent
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Abstract
Spent caustic and other wastewater streams are pretreated by continuous chemical oxidation. According to one aspect, a wastewater stream is pretreated by continuous chemical oxidation in a plug flow reactor. According to another aspect, a catalyst and an oxidizer are fed into a wastewater stream at first and second predetermined points of addition. Compounds in the wastewater stream susceptible to chemical oxidation are reacted with the chemical oxidizer. A modular, optionally fully automated apparatus is provided for pretreating spent caustic and other wastewater streams.
Claims22
A continuous process of pretreating a wastewater stream by chemical oxidation in
- a plug flow reactor, the process comprising:
- flowing a wastewater stream containing at least one compound susceptible to treatment by chemical oxidation;
- feeding a catalyst into said wastewater stream;
- feeding a chemical oxidizer into said wastewater stream, and mixing said wastewater stream and said chemical oxidizer to form a reactive mixture;
- and
- flowing said reactive mixture through a plug flow reactor under conditions sufficient to react said compound susceptible to treatment by chemical oxidation with said chemical oxidizer.
A continuous process of pretreating a wastewater stream by chemical oxidation, the process comprising:
- flowing a wastewater stream containing at least one compound susceptible to treatment by chemical oxidation;
- feeding a catalyst into said wastewater stream at a first predetermined point of addition, and mixing said catalyst and said wastewater stream;
- feeding a chemical oxidizer into said wastewater stream at a second predetermined point of addition downstream of said first predetermined point of addition, and mixing said chemical oxidizer and said wastewater stream;
- and
- reacting said compound susceptible to treatment by chemical oxidation with said chemical oxidizer.
Apparatus for continuously pretreating a wastewater stream by chemical oxidation in a plug flow reactor, the apparatus comprising a modular unit containing:
- means for flowing a wastewater stream containing at least one compound susceptible to treatment by chemical oxidation;
- means for feeding a chemical oxidizer into said wastewater stream;
- a plug flow reactor for reacting said compound susceptible to treatment by chemical oxidation with said chemical oxidizer;
- and
- a jacket surrounding the plug flow reactor for circulating a heat transfer fluid.
A continuous process of pretreating a spent caustic wastewater stream by chemical oxidation in a plug flow reactor, the process comprising:
- flowing a spent caustic wastewater stream containing at least one compound susceptible to treatment by chemical oxidation selected from the group consisting of sulfidic, phenolic, cresylic, and naphthenic compounds;
- adjusting the pH of said spent caustic wastewater stream by adding a pH adjusting medium to said spent caustic wastewater stream;
- feeding a catalyst into said spent caustic wastewater stream at a first predetermined point of addition, and mixing said catalyst and said spent caustic wastewater stream, wherein said catalyst comprises one or more compounds containing iron, manganese, or silicon;
- feeding an oxidizer comprising hydrogen peroxide into said spent caustic wastewater stream at a second predetermined point of addition, and mixing said oxidizer and said spent caustic wastewater stream;
- and
- flowing said spent caustic wastewater stream containing said catalyst and said oxidizer through a plug flow reactor under conditions sufficient to react said at least one compound susceptible to treatment by chemical oxidation with said hydrogen peroxide.
Apparatus for continuously pretreating a wastewater stream by chemical oxidation in a plug flow reactor, the apparatus comprising a modular unit containing:
- means for flowing a wastewater stream containing at least one compound susceptible to treatment by chemical oxidation;
- means for feeding a catalyst into said wastewater stream;
- means for feeding a chemical oxidizer into said wastewater stream;
- and
- a plug flow reactor for reacting said compound susceptible to treatment by chemical oxidation with said chemical oxidizer.
Apparatus for continuously pretreating a wastewater stream by chemical oxidation in a plug flow reactor, the apparatus comprising a modular unit containing:
- means for flowing a wastewater stream containing at least one compound susceptible to treatment by chemical oxidation;
- means for feeding a chemical oxidizer into said wastewater stream;
- a plug flow reactor for reacting said compound susceptible to treatment by chemical oxidation with said chemical oxidizer;
- and
- at least one module selected from the group consisting of:
- (a) means for feeding a pH adjusting medium into said wastewater stream at one or more points of addition;
- (b) a scrubber for treating vent gases present in said wastewater stream;
- (c) means for feeding a catalyst into said wastewater stream;
- and
- (d) means for separating acid gas and acid oil from said wastewater stream;
- the apparatus further comprising:
- means for determining at least one of pH, temperature, sulfide ion concentration, and oxidation-reduction potential of said wastewater stream;
- and
- means responsive to said determining means for adjusting at least one of pH, temperature, pressure, chemical oxidizer flowrate, and catalyst flowrate.
Dependencies are inferred from the claim text.