[1]田晓宇,周政,王秉政,等.混凝强化一级处理对市政污水组分的影响[J].中国给水排水,2026,42(11):34-43.
　TIANXiaoyu,ZHOUZheng,WANGBingzheng,et al.Effects of Coagulation?enhanced Primary Treatment on Municipal Wastewater Components[J].China Water & Wastewater,2026,42(11):34-43.
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混凝强化一级处理对市政污水组分的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第42卷 期数: 2026年第11期 页码: 34-43 栏目: 出版日期: 2026-06-01
Title:
Effects of Coagulation?enhanced Primary Treatment on Municipal Wastewater Components
作者:
田晓宇1， 周政1， 王秉政1， 李激1,2,3
（1.江南大学 环境与生态学院，江苏 无锡 214122；2.江苏省厌氧生物技术重点实验室，江苏 无锡 214122；3.江苏高校水处理技术与材料协同创新中心，江苏 苏州 215009）
Author(s):
TIAN　Xiaoyu1， ZHOU　Zheng1， WANG　Bingzheng1， LI　Ji1，2，3
（1. School of Environment and Ecology， Jiangnan University， Wuxi 214122， China； 2. Jiangsu Key Laboratory of Anaerobic Biotechnology， Wuxi 214122， China； 3. Jiangsu Collaborative Innovation Center of Water Treatment Technology and Materials， Suzhou 215009， China）
关键词:
化学强化一级处理;  碳磷转向;  溶解性有机物;  反硝化碳源
Keywords:
chemically enhanced primary treatment;  carbon and phosphorus redistribution;  dissolved organic matter;  denitrification carbon source
摘要:
针对污水处理厂低碳、资源化的需求，以FeCl?为混凝剂考察了混凝强化一级处理对污水组分的影响，通过混凝烧杯实验研究不同投加量下出水碳/氮/磷组分及比例、溶解性有机物（DOM）特征与反硝化碳源保留效果。结果表明，当FeCl3投加量为20 mg/L时SS去除率达到96.7%；当FeCl3投加量≥30 mg/L时，Fe3+水解产物过量导致出水SS浓度回升，同时溶解性Fe出现累积（>1.0 mg/L）。物料平衡分析显示，当FeCl3投加量为20和50 mg/L时分别有88.2%与93.3%的TP转移至污泥，污泥相磷由磷灰石无机磷（AP）主导转为非磷灰石无机磷（NAIP）与AP并重，混凝机制由吸附架桥/电中和主导向网捕卷扫转变；COD以相转移为主，分别有57.9%和53.9%的COD进入污泥；溶解性无机氮（DIN）基本存留于出水中。随着投药量的增加，出水碳氮比（C/N）降至3.22，B/C升至0.64。DOM去除特征随投药量的增加而改变，高分子质量、高芳香性腐殖质优先被去除；低投药量可保留挥发性脂肪酸（VFAs），反硝化速率达到4.47 mg/（gVSS·L）；高投药量易导致乙酸碳源损失，反硝化速率较原水下降54.6%。综合碳、磷组分回收与下游反硝化适配，FeCl3投加量在吸附架桥与电中和作用主导的10~20 mg/L最优。
Abstract:
In response to the low-carbon and resource-recovery demands of wastewater treatment plants, this study examined the impact of coagulation?enhanced primary treatment on wastewater components using FeCl3 as the coagulant. Jar tests were conducted to assess effluent C/N/P fractions and ratios, dissolved organic matter (DOM) characteristics, and the preservation of denitrification carbon sources under different FeCl3 dosages. At dosage of 20 mg/L, suspended solids (SS) removal reached 96.7%. When the dosage was ≥30 mg/L, excess iron hydrolysis products caused SS to rebound and led to the accumulation of soluble Fe (>1.0 mg/L). The mass balance showed that 88.2% and 93.3% of influent TP was transferred to sludge at 20 mg/L and 50 mg/L, respectively. Meanwhile, sludge phosphorus shifted from apatite phosphorus (AP) dominance to co-dominance of non-apatite inorganic phosphorus (NAIP) and AP. This indicated a transition of the coagulation mechanism from adsorption bridging/charge neutralization to sweep flocculation. COD was primarily transferred across phases, with 57.9% and 53.9% entering the sludge, while dissolved inorganic nitrogen (DIN) largely remained in the effulent. With increasing dosage, the effluent C/N ratio declined to 3.22, while B/C ratio increased to 0.64. The removal characteristics of DOM changed with increasing dosage. High-molecular weight and highly aromatic humic substances were preferentially removed. Volatile fatty acids (VFAs) were effectively preserved under low dosages, giving a denitrification rate of 4.47 mg/(gVSS·L). High dosages tended to deplete acetate and reduced the denitrification rate by 54.6% relative to raw wastewater. Considering carbon/phosphorus recovery and compatibility with downstream denitrification, the optimal dosage of FeCl3 was 10-20 mg/L, primarily driven by adsorption bridging and electric neutralization.

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更新日期/Last Update: 2026-06-01