当前位置:首页>学习笔记>学习笔记30:组织层级核算案例实操--逸散排放量计算(废水厌氧处理)

学习笔记30:组织层级核算案例实操--逸散排放量计算(废水厌氧处理)

  • 2026-05-26 18:55:11
学习笔记30:组织层级核算案例实操--逸散排放量计算(废水厌氧处理)

一、题目背景信息梳理

企业基本情况

  • 企业名称:华北地区某市纸业有限公司A
  • 成立时间:2005年
  • 位置:市工业园区,占地300亩
  • 原料:以废纸为原料生产高档纸板产品
  • 生产车间:蒸汽车间(蒸汽锅炉)+ 纸品生产车间(纸浆工艺+纸机工艺)

2022年废水处理相关数据

数据项目
数值
单位
厌氧处理系统进口COD浓度
10,000
mg/L
厌氧处理系统出口COD浓度
80
mg/L
2022年企业排放废水总量
480万t(即4,800,000吨)
t
废水厌氧处理排放因子
0.125
kgCH₄/kgCOD
CH₄的GWP值
27.9
甲烷是否回收利用
否(未回收)

二、逸散排放的概念明确

逸散排放:指有意识或无意识的泄漏、废水处理、废弃物处理等产生的温室气体排放。

对于废水厌氧处理产生的甲烷逸散,其活动数据不是废水总量本身,而是被微生物分解掉的COD(化学需氧量)总量

计算公式为:

三、第一步:计算被分解的COD总量

1. 计算COD浓度差

2. 单位换算

废水排放总量为480万t(吨),需要换算为升(L)。水的密度为1t/m³ = 1kg/L,因此:

换算过程

  • 1 t = 1,000 kg
  • 水的密度为1 kg/L
  • 因此 4,800,000 t = 4,800,000,000 L = 4.8 × 10⁹ L

3. 计算被分解的COD总量

COD浓度差的单位是mg/L,需要换算为kg/L,以便与废水总量(L)相乘得到kg单位的COD量。

四、第二步:计算甲烷(CH₄)排放量

废水厌氧处理排放因子为 0.125 kgCH₄/kgCOD,即每分解1kg COD会产生0.125kg的甲烷。

五、第三步:折算为CO₂当量

题目给出的CH₄的GWP值为 27.9(100年尺度)。

六、第四步:单位换算为吨

七、完整计算过程汇总表

计算步骤
数值
单位
计算公式
① 进水COD浓度
10,000
mg/L
题目给定
② 出水COD浓度
80
mg/L
题目给定
③ COD浓度差(①-②)
9,920
mg/L
③ = ① - ②
④ 废水总量
4,800,000,000
L
4,800,000 t × 1,000 L/t
⑤ 被分解的COD总量
47,616,000
kg COD
⑤ = ③ × ④ ÷ 1,000,000(mg→kg换算)
⑥ 排放因子
0.125
kgCH₄/kgCOD
题目给定
⑦ CH₄排放量(⑤×⑥)
5,952,000
kgCH₄
⑦ = ⑤ × ⑥
⑧ GWP值
27.9
题目给定
⑨ CO₂e排放量(⑦×⑧)
166,060,800
kgCO₂e
⑨ = ⑦ × ⑧
⑩ 最终结果(⑨÷1,000)166,060.8tCO₂e

八、关键分析:题目中需要注意的细节

1. 活动数据的正确理解

在废水厌氧处理中,活动数据不是废水总量,而是被分解掉的COD总量

“对于废水厌氧处理产生的甲烷逸散,活动数据不是废水总量,而是被微生物分解掉的COD(化学需氧量)总量。”

因此不能直接用“480万t废水”作为活动数据乘以排放因子,必须先计算被分解的COD量。

2. 浓度单位的换算

  • COD浓度单位为 mg/L(毫克/升)
  • 废水总量单位为 t(吨)
  • 需要先将废水总量换算为升(L):1 t = 1,000 L
  • 再将mg换算为kg:1 mg = 10⁻⁶ kg
  • 具体换算:9,920 mg/L × 4.8 × 10⁹ L = 9,920 × 10⁻⁶ kg/L × 4.8 × 10⁹ L

3. 排放因子的单位理解

排放因子为 0.125 kgCH₄/kgCOD,即每分解1千克COD会产生0.125千克甲烷。

物理含义:废水中的有机物(以COD表示)在厌氧条件下被微生物分解时,会产生甲烷气体。

4. 甲烷未回收的影响

题目明确说明“企业对污水处理过程中产生的甲烷没有进行回收利用”。

这意味着产生的甲烷全部排放到大气中,因此计算出的CH₄排放量就是实际的逸散排放量。

  • 如果企业回收了甲烷(如用于发电或供暖),则需要扣除回收的部分
  • 本题未回收,因此全部计入排放

5. 范围归属

  • 废水厌氧处理产生的甲烷逸散属于范围一:直接排放
  • 因为这是企业拥有或控制的排放源产生的直接排放

九、常见错误与易错点

常见错误
错误原因
正确做法
直接用废水总量计算
误认为活动数据是废水总量
活动数据应是被分解的COD总量(进水-出水)
忽略单位换算
mg/L、t、L之间的换算容易出错
先将废水总量换算为L,再将mg换算为kg
忘记乘以GWP值
只计算了CH₄排放量,没有折算为CO₂e
非CO₂温室气体必须乘以GWP值
错用排放因子
将COD排放因子与CH₄排放因子混淆
注意排放因子单位:kgCH₄/kgCOD
单位换算错误(废水总量)
1 t = 1 m³ = 1,000 L,容易误算
480万t = 4,800,000,000 L

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  1. CONNECT:[ UseTime:0.000816s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001429s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000646s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005167s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001493s ]
  6. SELECT * FROM `set` [ RunTime:0.000539s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001537s ]
  8. SELECT * FROM `article` WHERE `id` = 490824 LIMIT 1 [ RunTime:0.001349s ]
  9. UPDATE `article` SET `lasttime` = 1779793790 WHERE `id` = 490824 [ RunTime:0.009205s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000278s ]
  11. SELECT * FROM `article` WHERE `id` < 490824 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000687s ]
  12. SELECT * FROM `article` WHERE `id` > 490824 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005285s ]
  13. SELECT * FROM `article` WHERE `id` < 490824 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002610s ]
  14. SELECT * FROM `article` WHERE `id` < 490824 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003381s ]
  15. SELECT * FROM `article` WHERE `id` < 490824 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002950s ]
0.168347s