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Flame-free torch type ultra-clean discharge process for high-ammonia-nitrogen wastewater containing VOCs

A high-ammonia-nitrogen, waste water technology, applied in the direction of water pollutants, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of high process energy consumption, high cost of waste water treatment, and insufficient utilization efficiency of VOCs resources.

Pending Publication Date: 2020-05-08
JIANGSU SUNPOWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy consumption of the process is high, the resource utilization efficiency of ammonia nitrogen and VOCs is insufficient, and the cost of wastewater treatment is generally high

Method used

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  • Flame-free torch type ultra-clean discharge process for high-ammonia-nitrogen wastewater containing VOCs
  • Flame-free torch type ultra-clean discharge process for high-ammonia-nitrogen wastewater containing VOCs
  • Flame-free torch type ultra-clean discharge process for high-ammonia-nitrogen wastewater containing VOCs

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Embodiment 1

[0039] figure 1 A specific embodiment of the invention is shown in which figure 1 It is a structural schematic diagram of the present invention. See figure 1 , a flameless torch type ultra-clean discharge system for high ammonia nitrogen containing VOCs waste water, mainly including a pretreatment unit 1, a stripping unit, a flameless torch unit, an evaporation crystallization unit and a postprocessing unit 10; the pretreatment unit 1, steam The extraction unit, the flameless torch unit, and the evaporation crystallization unit are connected in sequence, and the post-treatment unit 10 is connected to the stripping unit pipeline; the pre-treatment unit 1 is used to pre-treat VOCs-containing high-ammonia-nitrogen wastewater to reduce the Heavy metal ions, suspended solids, chroma, hardness and COD; the stripping unit is used for the recovery of ammonia nitrogen and the separation of VOCs; the flameless torch unit is used for ultra-clean decomposition and oxidation of VOCs; the...

Embodiment 2

[0045] The leachate treatment capacity of a waste incineration plant is 150m 3 / d, its water quality index organic acid is 10000~20000mg / L, COD cr 20000~40000mg / L, BOD 5 10000~20000mg / L, NH 3 -N is 5000-8000mg / L, suspended matter SS is 3000-8000mg / L, total hardness is 3000-5000mg / L, and pH is 6-8. Among them, the concentration of various heavy metal ions is 20-50 mg / L for Fe, 3-5 mg / L for Zn, 3-5 mg / L for Cr, and 2-3 mg / L for Mn.

[0046] The temperature of the feed wastewater is 5-35°C, and the wastewater first enters the regulating pool 11 in the pretreatment unit 1 for homogenization to reduce the impact of water quality fluctuations; then enters the dosing pool 12, where NaOH and NaOH are added 2 CO 3 solution, the dosing tank 12 is provided with a stirrer; the waste water enters the high-density clarification tank 13 from the dosing tank 12, and adds polyferric chloride and polyacrylamide into the coagulation tank 131 and the flocculation tank 132 respectively and sti...

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Abstract

The invention discloses a flame-free torch type ultra-clean discharge process for high-ammonia-nitrogen wastewater containing VOCs. The process comprises the following steps that: wastewater is pretreated by a pretreatment unit and then enters a stripping tower to recover ammonia nitrogen, VOCs in the wastewater are separated out at the same time, and ammonia nitrogen is recovered into an ammoniawater tank in the form of ammonia water under the action of a condenser; the VOCs existing in a gas phase are heated by a second preheater and then enter an oxidation tower, decomposition and oxidation reactions are carried out under the action of a catalyst, and exhaust gas products containing carbon dioxide, sulfur dioxide, water and the like are generated; a high-temperature exhaust gas productheats the tower-entering VOCs in the second preheater, and after heat exchange, ultra-clean discharge of tail gas is realized after spraying and washing by the ammonia water from the ammonia water tank in an absorption tower, and spraying and washing liquid enters a crystallizer for evaporative crystallization to obtain ammonium salt; waste liquid discharged from the bottom of a stripping tower passes through a first preheater for preheating of feed wastewater and then passes through a post-treatment unit, so ultra-clean discharge of the wastewater is realized.

Description

technical field [0001] The invention belongs to the technical field of ultra-clean discharge of waste water and waste gas, and in particular relates to a flameless torch-type ultra-clean discharge process for waste water containing VOCs and high ammonia nitrogen. Background technique [0002] Volatile organic compounds (VOCs) are a class of substances with complex composition and wide distribution, which are harmful to the environment. With the introduction of the "Action Plan for Air Pollution Prevention and Control", the control of VOCs has also been unprecedentedly strengthened. Especially for VOCs that escape from waste water, waste liquid, and waste residue, they need to be treated and discharged in an ultra-clean manner. For example, VOCs released during the collection, transportation, storage and treatment of petrochemical wastewater are one of the main sources of VOCs emissions in petrochemical enterprises. It enters the atmosphere through the contact surface betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F9/14C01C1/26C02F101/16C02F101/20C02F101/32C02F103/06C02F103/34
CPCC02F9/00B01D53/18B01D53/14C01C1/26C02F2101/322C02F2101/16C02F2103/34C02F2103/06C02F2101/20C02F2209/10C02F2209/055C02F1/10C02F2301/08C02F1/04C02F1/043C02F1/66C02F2209/08C02F1/5281C02F2001/007C02F1/725B01D2258/02C02F1/001C02F3/2846C02F3/1215
Inventor 郭宏新何松赵志红刘丰王建果陈飞
Owner JIANGSU SUNPOWER TECH
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