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Treatment method of arsenic-containing organic wastewater

A technology of organic wastewater and treatment methods, applied in water/sewage treatment, water treatment parameter control, water/sewage multi-stage treatment, etc., to achieve the effects of improving utilization rate, simplifying process flow, reducing investment and operating costs

Active Publication Date: 2020-07-31
LASER RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing arsenic-containing organic wastewater treatment process has obvious deficiencies, and it is urgent to find an environmentally friendly, cost-effective, and high-discharge standard arsenic-containing organic wastewater treatment method

Method used

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  • Treatment method of arsenic-containing organic wastewater

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Experimental program
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Effect test

Embodiment

[0051] Example: Water quality of arsenic-containing wastewater from an arsenic product enterprise:

[0052] Arsenic-containing acid-alkali wastewater: pH=6, arsenic content in wastewater TAs=200mg / L, COD=150mg / L, wastewater production 10m 3 / day, collected up to 800m 3 Reconciliation pool pending.

[0053] Step 1: Pump the arsenic-containing wastewater in the adjustment tank to a 400L mixing tank, adjust the pH of the wastewater to 3 with dilute sulfuric acid, set a 500L reaction tank downstream of the mixing tank, and set up a connecting pipeline between the mixing tank and the reaction tank The nano-iron particle generation device controls the flow rate of the waste water from the 400L mixing tank into the 500L reaction tank to be 1m3 / hour. The waste water enters the 500L reaction barrel;

[0054] Step 2: Dosing H into the reaction barrel 2 o 2 , the metering pump flow rate is set to 3.5L / hour, H 2 o 2 The molar ratio to iron is 3:1, ORP>450mV is controlled, and the r...

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Abstract

The invention relates to a treatment method of arsenic-containing organic wastewater, which comprises the following steps: (1) regulating the pH value of the arsenic-containing organic wastewater to 2-4, and enabling the pH-regulated wastewater to flow through a nano-iron particle generation device, so that the nano-iron particle generation device generates nano-iron particles in situ in the wastewater; (2) adding H2O2 into the wastewater added with the nano-iron particles to carry out nano-iron / heterogeneous Fenton oxidation reaction until the reaction is finished; and (3) adjusting the pH value of the reacted mixed solution to 8-9, and separating out the arsenic ion flocculent precipitate from the wastewater. The treatment method provided by the invention has good arsenic removal and CODremoval effects on arsenic-containing organic wastewater, and can meet increasingly strict arsenic discharge standards.

Description

technical field [0001] The invention relates to the technical field of heavy metal industrial wastewater treatment, in particular to a treatment method for arsenic-containing organic wastewater. Background technique [0002] Arsenic-containing organic wastewater from the arsenic compound synthesis workshop usually comes from two parts, one part comes from the production process of arsenic products; the second part comes from ground flushing water and road rainwater. As a class I pollutant, the discharge of arsenic is strictly controlled. In Table 2 of the "Discharge Standards for Industrial Pollutants of Tin, Antimony and Mercury" (GB30770-2014), it is required that arsenic <0.1mg / L, and the special discharge standard is arsenic <0.05 mg / L. However, some environmental capacity is small or the discharge of arsenic is subject to total control or zero discharge. Commonly used industrial arsenic removal methods include chemical precipitation, electrocoagulation, arsenic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/10C02F101/30
CPCC02F9/00C02F1/66C02F1/725C02F1/722C02F1/56C02F1/281C02F1/4678C02F1/463C02F1/5236C02F2305/026C02F2101/103C02F2101/30C02F2209/08
Inventor 郭建伟王国庆丁莉唐先存程飞刘连杰徐开宝李旭东
Owner LASER RES INST OF SHANDONG ACAD OF SCI
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