社会中的煤制气废水处理工艺你知道吗一份完整的旅游计划书

水质分析

根据焦化厂煤制气生产工艺的特点，废水主要来自煤中的水份，水同煤中挥发份一起进入煤气排送工序，煤气在冷却过程中，水和焦油形成混合冷凝液，经气液分离器和初冷器的水封排出到氨水机械化澄清槽，经澄清分离出焦油和氨水，氨水进入剩余氨水中间槽，多余的氨水送去蒸汽生成；粗苯工序在生产粗苯时形成粗笨分离water；全厂所有coal gas water seal直接排放；储配站coal gas cold condensate及其他废water。

工艺流程选择

从指标来看，此废water宜采用“物化+生化+物化”的处理工艺。物化处理的主要任务是去除oil、sulfur compounds、cyanide、high concentration ammonia and phenol,保障生化处理的正常进行；生化处理的主要任务是降解废water中的可生物降解物质，并进行脱nitrogen；生物出water再进行物化处理，更进一步去除废water中污染物质，以确保达标排放。但material and biological treatment processes have a variety of types, each with its characteristics, how to choose the appropriate mature, reliable and reasonable process is the key to this project.

Biological denitrification is an application of nitrification and denitrification. Nitrification is in wastewater treatment, where ammonia nitrogen under aerobic conditions through heterotrophic bacteria oxidation into nitrite and nitrate ions' reaction. Denitrification is in anaerobic conditions under denitrogen bacteria utilization of metabolic products produced by anaerobic digestion to oxidize organic matter using NO2-N and NO3-N instead of oxygen for organic matter decomposition, completing the denitration task.

Denitrification methods are numerous domestically but applied mainly includes A/O internal circulation process which we adopted as our processing technology: grit chamber + oil-water separator + dissolved air flotation + primary sedimentation + ammonia stripping + UASB anoxic reactor + first-stage A/O biological treatment + second-stage A/O biological treatment + MBR membrane bioreactor.

Wastewater Treatment Process Explanation

Coal gas cooling water first enters into adjustment pool for adjustment; outflow from the pool passes through air-lift pump into oil-water separator; then flows into dissolved air flotation tank after adding polyelectrolyte (PFS) or polyacrylamide (PAM); after flocculation mixing liquid enters dissolved air flotation tank where sudden pressure release releases countless fine bubbles which combine with "alumina" particles suspended in water to form scum floating on surface; skimmer removes scum periodically; scum flows into sludge pool via pipeline.

After separation removing pollutants from wastewater, it flows directly into primary sedimentation tank for further settlement before flowing into secondary sedimentation tank where settling occurs again followed by pumping up to UASB anoxic reactor for denitrifying.

In UASB reactor lacking oxygen environment has microorganisms utilize metabolic products generated during anaerobic digestion converting long-chain organics formed during previous stages back to short-chain organics.

Since wastewater contains large amounts of aromatic hydrocarbons difficultly degradable by microorganisms setting up anoxic stage aims at utilizing anoxic microbial transformation or degradation opening ring structures or chain lengthening making them easier degradable materials.

Then adjusting pH value back within alkaline range while having O2 present generates iron(III)hydroxide exhibiting coagulation properties useful for further removal of organic substances.

PH value readjusted returning O2 presence facilitates complete degradation within short time without limitations imposed by type composition concentration etc., especially suitable for treating difficult-to-degrade industrial wastewater's handling.

Next following acid addition adjusts pH downstream flow goes towards activated sludge unit 1 & 2 with two-stage aerobic-anoxic-anaerobic-aeration system featuring sequential biological treatments involving high-efficiency BOD removal COD reduction nutrient removal effluent quality control integration & flexibility enabling efficient use low operating costs & minimal environmental impact:

First Stage - Anaerobic Biological Treatment Unit: The initial step involves biochemical reactions that occur in absence o